bitcoin-knots: convert to a role, de-Uptime-Kuma the health check

892-line playbook becomes 40 lines plus a role with install/build/configure/
service/healthcheck phases, five templates and one handler. bitcoin_knots_vars.yml
is deleted; its content is the role's defaults.

Verified after a real run: bitcoind still active since 2026-08-19 (NO restart),
chain at 966844 blocks / 875 GB, DATUM config intact, dbcache still 200, health
check timer firing again. changed=3, all health-check. vipy changed=0.

⚠ THE BIG ONE: the playbook would have deleted the mining integration.

bitcoin.conf on the node carries a section that was hand-added and was missing
from the template entirely:

    blockmaxsize=3985000
    blockmaxweight=3985000
    blocknotify=killall -USR1 datum_gateway
    maxmempool=1000
    blockreconstructionextratxn=1000000

blocknotify is how datum_gateway learns a new block landed. Running the old
playbook would have stripped all of it and solo mining would have carried on
against a stale template - a silent failure that costs money rather than raising
an error. Also dbcache 200 -> 3528 (hand-tuned down; the calculation wants 90% of
RAM) and logging moved off the file. All now reconciled, dbcache behind
bitcoin_dbcache_mb_override.

bitcoin-knots and datum-gateway are ONE SYSTEM. Noted in the README.

AND MY OWN FIX MADE IT MORE DANGEROUS. The `Restart bitcoind` handler was guarded
by uptime_kuma_enabled, so it had been inert: bitcoin.conf and the systemd unit
both notify it and neither could restart anything - a config change applied to
disk, reported success, and never took effect. Ungating that is right, but it
converts "wrong config sitting inertly on disk" into "node restarted onto a
config that breaks mining". The ungating had to land WITH the template
reconciliation, not before it.

It also raises the bar permanently: any residual template/live difference now
restarts a Bitcoin node on every run. Four rounds of --check --diff to reach
changed=0 - the DATUM section, an explanatory comment that was rendering into the
deployed config (now a {# #} Jinja comment), a "# Pruning (optional)" comment the
live file had, and one trailing blank line.

The build path is 32 tasks all guarded by `not bitcoind_binary_exists.stat.exists`,
so a converged host skips the 30-60 minute compile and both `state: absent`
deletions. Those target /opt/bitcoin-knots/{source,bitcoin-<version>}; the chain
is in /mnt/knots_data and is never touched. Signature-verification tasks copied
verbatim.

The health check timer had last fired 2026-08-09 while reporting active/enabled -
same OnBootSec + OnUnitActiveSec dead chain as fulcrum. The role runs the check
once after enabling to supply the reference the timer schedules from.

Ownership parity checked mechanically against `git show HEAD:`, keyed by TASK
NAME rather than path - keying by path gave a false positive, because
bitcoin_knots_source_dir is created with ownership and later removed with
state: absent, so whichever task comes last wins and that differs between one
file and five. 13/13 match.

bitcoin_p2p_port and the tailscale hostname moved to services_config.yml for the
socket-proxy play on the edge host.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ansible/group_vars/all/vault.yml

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ansible/roles/bitcoin_knots/README.md

@@ -0,0 +1,85 @@
+# `bitcoin_knots`
+
+Builds Bitcoin Knots from source with PGP + SHA256 verification of the release
+tarball, runs it as a full node on `knots-box`, and keeps a health check on a
+systemd timer. The second play in the calling playbook publishes the P2P port
+from the edge host via `socket_proxy`.
+
+Converted from `deploy_bitcoin_knots_playbook.yml` (892 lines) under Plan 6. The
+playbook is now 40 lines.
+
+## The build is guarded; the chain is never touched
+
+`build.yml` is 32 tasks, every one carrying
+`when: not bitcoind_binary_exists.stat.exists`. On a host that already has the
+binary the whole download / verify / 30-60 minute compile skips — **including the
+two `state: absent` deletions**, which target `/opt/bitcoin-knots/source` and the
+extracted build directory.
+
+The chain lives elsewhere and nothing here touches it:
+
+| | |
+|---|---|
+| `bitcoin_knots_dir` | `/opt/bitcoin-knots` — build tree, safe to delete |
+| `bitcoin_data_dir` | `/var/lib/bitcoin` — config, logs, wallets |
+| `bitcoin_large_data_dir` | `/mnt/knots_data` — **~875 GB of blockchain** |
+
+The signature-verification tasks are the security control of this role. They are
+copied verbatim; do not "simplify" them.
+
+## ⚠ This node is half of the mining setup
+
+`bitcoin.conf` carries a DATUM Gateway section that was hand-added on the node
+and was **missing from the playbook's template**:
+
+```ini
+blockmaxsize=3985000
+blockmaxweight=3985000
+blocknotify=killall -USR1 datum_gateway
+maxmempool=1000
+blockreconstructionextratxn=1000000
+```
+
+`blocknotify` is how `datum_gateway` learns a new block landed. Running the old
+playbook would have deleted all of it, and solo mining would have carried on
+grinding against a stale template — a silent failure that costs money rather
+than raising an error. The template now carries it behind
+`bitcoin_datum_gateway_enabled`.
+
+**bitcoin-knots and datum-gateway are one system, not two services.** Changing
+either config means thinking about both.
+
+## The restart handler, and why exactness matters now
+
+The hand-written `Restart bitcoind` handler carried
+`when: uptime_kuma_enabled | default(false)`, so it had been inert since the
+decommissioning: `bitcoin.conf` and the systemd unit both notify it and neither
+could restart anything. A config change applied to disk, reported success, and
+never took effect.
+
+It is ungated here — which raises the bar for the template. **Any** residual
+difference between the template and the live file, down to a trailing newline,
+means the task reports `changed` and restarts a Bitcoin node on every run. It
+took four rounds of `--check --diff` to reach `changed=0`: the DATUM section, an
+explanatory comment that was rendering into the deployed file (now a `{# #}`
+Jinja comment), a `# Pruning (optional)` comment the live file had, and one
+trailing blank line.
+
+## `dbcache`
+
+Computed as 90% of RAM unless `bitcoin_dbcache_mb_override` is set. The live node
+was hand-tuned to **200 MB**; the calculation produces 3528. As with fulcrum,
+`set_fact` outranks role defaults, so the *calculation* honours the override — a
+value pinned only in `defaults/` is silently ignored.
+
+## Monitoring: one variable, no product knowledge
+
+The check tests bitcoind's RPC and records the answer in its exit code, which
+systemd keeps: `systemctl is-failed bitcoin-knots-healthcheck.service`. Set
+`healthcheck_push_url` to report anywhere that accepts an HTTP ping.
+
+The timer had last fired **2026-08-09** while still reporting `active` and
+`enabled` — the same `OnBootSec` + `OnUnitActiveSec` dead chain as fulcrum, where
+nothing re-arms it if the service does not run in a given boot. The role runs the
+check once after enabling, which both smoke-tests it and supplies the reference
+the timer schedules from.

ansible/roles/bitcoin_knots/defaults/main.yml

@@ -0,0 +1,71 @@
+# Bitcoin Knots Configuration Variables
+
+# Version - REQUIRED: Specify exact version/tag to build
+bitcoin_knots_version: "v29.2.knots20251110"  # Must specify exact version/tag
+bitcoin_knots_version_short: "29.2.knots20251110"  # Version without 'v' prefix (for tarball URLs)
+
+# Directories
+bitcoin_knots_dir: /opt/bitcoin-knots
+bitcoin_knots_source_dir: "{{ bitcoin_knots_dir }}/source"
+bitcoin_data_dir: /var/lib/bitcoin  # Standard location for config, logs, wallets
+bitcoin_large_data_dir: /mnt/knots_data  # Custom location for blockchain data (blocks, chainstate)
+bitcoin_conf_dir: /etc/bitcoin
+
+# Network
+bitcoin_rpc_port: 8332
+# Shared with the socket-proxy play on the edge host, so it lives in
+# services_config.yml rather than only here.
+bitcoin_p2p_port: "{{ service_settings.bitcoin.p2p_port }}"
+bitcoin_rpc_bind: "0.0.0.0"
+
+# Build options
+bitcoin_build_jobs: 4  # Parallel build jobs (-j flag), adjust based on CPU cores
+bitcoin_build_prefix: /usr/local
+
+# Configuration options
+bitcoin_enable_txindex: true  # Set to true if transaction index needed (REQUIRED for Electrum servers like Electrs/ElectrumX)
+bitcoin_max_connections: 125
+# dbcache will be calculated as 90% of host RAM automatically in playbook
+
+# ZMQ Configuration
+bitcoin_zmq_enabled: true
+bitcoin_zmq_bind: "tcp://0.0.0.0"
+bitcoin_zmq_port_rawblock: 28332
+bitcoin_zmq_port_rawtx: 28333
+bitcoin_zmq_port_hashblock: 28334
+bitcoin_zmq_port_hashtx: 28335
+
+# Service user
+bitcoin_user: bitcoin
+bitcoin_group: bitcoin
+
+# --- Health check ----------------------------------------------------------
+# Checks bitcoind RPC and records the answer in its exit code, which systemd
+# keeps: `systemctl is-failed bitcoin-knots-healthcheck.service`.
+#
+# WHERE TO REPORT HEALTH — the one place to plug in monitoring. Empty means
+# check, exit honestly, report nowhere. Any endpoint accepting an HTTP ping
+# works; nothing here is specific to a monitoring product.
+healthcheck_push_url: ""
+
+# --- Logging ----------------------------------------------------------------
+# The live node logs to a file. Set to "" to use printtoconsole=1 (journald).
+bitcoin_logfile: "{{ bitcoin_data_dir }}/debug.log"
+
+# --- dbcache ----------------------------------------------------------------
+# Computed as 90% of RAM unless this is set. The live node was hand-tuned to
+# 200 MB; the calculation would have produced 3528. As with fulcrum, note that
+# set_fact outranks role defaults, so the CALCULATION has to honour this - a
+# value pinned only in defaults/ is silently ignored.
+bitcoin_dbcache_mb_override: 200
+
+# --- DATUM Gateway ----------------------------------------------------------
+# This node feeds block templates to datum_gateway on knots-box. These settings
+# were hand-added to bitcoin.conf and were missing from the template, so a
+# playbook run would have removed them and broken the mining setup.
+bitcoin_datum_gateway_enabled: true
+bitcoin_blockmaxsize: 3985000
+bitcoin_blockmaxweight: 3985000
+bitcoin_blocknotify: "killall -USR1 datum_gateway"
+bitcoin_maxmempool: 1000
+bitcoin_blockreconstructionextratxn: 1000000

ansible/roles/bitcoin_knots/handlers/main.yml

@@ -0,0 +1,14 @@
+---
+# Ungated on purpose. The hand-written handler carried
+#   when: uptime_kuma_enabled | default(false)
+# so it has been inert since the decommissioning. Two tasks notify it —
+# bitcoin.conf and the systemd unit — and neither could actually restart
+# bitcoind. A configuration change to a Bitcoin node therefore applied to disk,
+# reported success, and silently never took effect.
+#
+# Restarting bitcoind re-opens the chainstate; it does not reindex.
+- name: Restart bitcoind
+  systemd:
+    name: bitcoind
+    state: restarted
+    daemon_reload: yes

ansible/roles/bitcoin_knots/tasks/build.yml

@@ -0,0 +1,222 @@
+---
+# Every task here is guarded by `when: not bitcoind_binary_exists.stat.exists`,
+# so on a host that already has the binary the whole download / verify / build
+# sequence skips — including the two `state: absent` deletions, which target
+# /opt/bitcoin-knots/{source,bitcoin-<version>} and never the chain data in
+# /mnt/knots_data.
+- name: Check if bitcoind binary already exists
+  stat:
+    path: "{{ bitcoin_build_prefix }}/bin/bitcoind"
+  register: bitcoind_binary_exists
+  changed_when: false
+
+- name: Install gnupg for signature verification
+  apt:
+    name: gnupg
+    state: present
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Import Luke Dashjr's Bitcoin Knots signing key
+  command: gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys 90C8019E36C2E964
+  register: key_import
+  changed_when: "'already in secret keyring' not in key_import.stdout and 'already in public keyring' not in key_import.stdout"
+  when: not bitcoind_binary_exists.stat.exists
+  failed_when: key_import.rc != 0
+
+- name: Display imported key fingerprint
+  command: gpg --fingerprint 90C8019E36C2E964
+  register: key_fingerprint
+  changed_when: false
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Download SHA256SUMS file
+  get_url:
+    url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/SHA256SUMS"
+    dest: "/tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS"
+    mode: '0644'
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Download SHA256SUMS.asc signature file
+  get_url:
+    url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/SHA256SUMS.asc"
+    dest: "/tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS.asc"
+    mode: '0644'
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Verify PGP signature on SHA256SUMS file
+  command: gpg --verify /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS.asc /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS
+  register: sha256sums_verification
+  changed_when: false
+  failed_when: false  # Don't fail here - check for 'Good signature' in next task
+  when: not bitcoind_binary_exists.stat.exists
+
+
+- name: Display SHA256SUMS verification result
+  debug:
+    msg: "{{ sha256sums_verification.stdout_lines + sha256sums_verification.stderr_lines }}"
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Fail if SHA256SUMS signature verification failed
+  fail:
+    msg: "SHA256SUMS signature verification failed. Aborting build."
+  when: not bitcoind_binary_exists.stat.exists and ('Good signature' not in sha256sums_verification.stdout and 'Good signature' not in sha256sums_verification.stderr)
+
+- name: Remove any existing tarball to force fresh download
+  file:
+    path: /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
+    state: absent
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Download Bitcoin Knots source tarball
+  get_url:
+    url: "{{ bitcoin_source_tarball_url }}"
+    dest: "/tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz"
+    mode: '0644'
+    validate_certs: yes
+    force: yes
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Calculate SHA256 checksum of downloaded tarball
+  command: sha256sum /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
+  register: tarball_checksum
+  changed_when: false
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Extract expected checksum from SHA256SUMS file
+  shell: grep "bitcoin-{{ bitcoin_knots_version_short }}.tar.gz" /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS | awk '{print $1}'
+  register: expected_checksum
+  changed_when: false
+  when: not bitcoind_binary_exists.stat.exists
+  failed_when: expected_checksum.stdout == ""
+
+- name: Display checksum comparison
+  debug:
+    msg:
+      - "Expected: {{ expected_checksum.stdout | trim }}"
+      - "Actual: {{ tarball_checksum.stdout.split()[0] }}"
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Verify tarball checksum matches SHA256SUMS
+  fail:
+    msg: "Tarball checksum mismatch! Expected {{ expected_checksum.stdout | trim }}, got {{ tarball_checksum.stdout.split()[0] }}"
+  when: not bitcoind_binary_exists.stat.exists and expected_checksum.stdout | trim != tarball_checksum.stdout.split()[0]
+
+- name: Remove existing source directory if it exists (to force fresh extraction)
+  file:
+    path: "{{ bitcoin_knots_source_dir }}"
+    state: absent
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Remove extracted directory if it exists (from previous runs)
+  file:
+    path: "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}"
+    state: absent
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Extract verified source tarball
+  unarchive:
+    src: /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
+    dest: "{{ bitcoin_knots_dir }}"
+    remote_src: yes
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Check if extracted directory exists
+  stat:
+    path: "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}"
+  register: extracted_dir_stat
+  changed_when: false
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Rename extracted directory to expected name
+  command: mv "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}" "{{ bitcoin_knots_source_dir }}"
+  when: not bitcoind_binary_exists.stat.exists and extracted_dir_stat.stat.exists
+
+- name: Check if CMakeLists.txt exists
+  stat:
+    path: "{{ bitcoin_knots_source_dir }}/CMakeLists.txt"
+  register: cmake_exists
+  changed_when: false
+  when: not bitcoind_binary_exists.stat.exists
+
+- name: Create CMake build directory
+  file:
+    path: "{{ bitcoin_knots_source_dir }}/build"
+    state: directory
+    mode: '0755'
+  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
+
+- name: Configure Bitcoin Knots build with CMake
+  command: >
+    cmake
+    -DCMAKE_INSTALL_PREFIX={{ bitcoin_build_prefix }}
+    -DBUILD_BITCOIN_WALLET=OFF
+    -DCMAKE_BUILD_TYPE=Release
+    -DWITH_ZMQ=ON
+    ..
+  args:
+    chdir: "{{ bitcoin_knots_source_dir }}/build"
+  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
+  register: configure_result
+  changed_when: true
+
+- name: Verify CMake enabled ZMQ
+  shell: |
+    set -e
+    cd "{{ bitcoin_knots_source_dir }}/build"
+    cmake -LAH .. | grep -iE 'ZMQ|WITH_ZMQ|ENABLE_ZMQ|USE_ZMQ'
+  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
+  register: zmq_check
+  changed_when: false
+
+- name: Fail if CMakeLists.txt not found
+  fail:
+    msg: "CMakeLists.txt not found in {{ bitcoin_knots_source_dir }}. Cannot build Bitcoin Knots."
+  when: not bitcoind_binary_exists.stat.exists and not (cmake_exists.stat.exists | default(false))
+
+- name: Build Bitcoin Knots with CMake (this may take 30-60+ minutes)
+  command: cmake --build . -j{{ bitcoin_build_jobs }}
+  args:
+    chdir: "{{ bitcoin_knots_source_dir }}/build"
+  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
+  async: 3600
+  poll: 0
+  register: build_result
+  changed_when: true
+
+- name: Check build status
+  async_status:
+    jid: "{{ build_result.ansible_job_id }}"
+  register: build_job_result
+  until: build_job_result.finished
+  retries: 120
+  delay: 60
+  when: not bitcoind_binary_exists.stat.exists and build_result.ansible_job_id is defined
+
+- name: Fail if build failed
+  fail:
+    msg: "Bitcoin Knots build failed: {{ build_job_result.msg }}"
+  when: not bitcoind_binary_exists.stat.exists and build_result.ansible_job_id is defined and build_job_result.failed | default(false)
+
+- name: Install Bitcoin Knots binaries
+  command: cmake --install .
+  args:
+    chdir: "{{ bitcoin_knots_source_dir }}/build"
+  when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
+  changed_when: true
+
+- name: Verify bitcoind binary exists
+  stat:
+    path: "{{ bitcoin_build_prefix }}/bin/bitcoind"
+  register: bitcoind_installed
+  changed_when: false
+
+- name: Verify bitcoin-cli binary exists
+  stat:
+    path: "{{ bitcoin_build_prefix }}/bin/bitcoin-cli"
+  register: bitcoin_cli_installed
+  changed_when: false
+
+- name: Fail if binaries not found
+  fail:
+    msg: "Bitcoin Knots binaries not found after installation"
+  when: not bitcoind_installed.stat.exists or not bitcoin_cli_installed.stat.exists

ansible/roles/bitcoin_knots/tasks/configure.yml

@@ -0,0 +1,20 @@
+---
+# Ownership copied verbatim from the playbook this replaces; verified
+# mechanically against `git show HEAD:` rather than retyped from memory.
+- name: Create bitcoin.conf configuration file
+  ansible.builtin.template:
+    src: bitcoin.conf.j2
+    dest: "{{ bitcoin_conf_dir }}/bitcoin.conf"
+    owner: "{{ bitcoin_user }}"
+    group: "{{ bitcoin_group }}"
+    mode: '0640'
+  notify: Restart bitcoind
+
+- name: Create systemd service file for bitcoind
+  ansible.builtin.template:
+    src: bitcoind.service.j2
+    dest: /etc/systemd/system/bitcoind.service
+    owner: root
+    group: root
+    mode: '0644'
+  notify: Restart bitcoind

ansible/roles/bitcoin_knots/tasks/healthcheck.yml

@@ -0,0 +1,56 @@
+---
+# Everything here answers "is bitcoind healthy" and records the answer. The
+# Uptime Kuma specifics that used to follow — an embedded Python script creating
+# monitors over the API, a /tmp credentials file, push-URL extraction and a
+# systemd Environment= rewrite — are gone. Where it reports is now one variable,
+# healthcheck_push_url. See the role README.
+- name: Install curl for health check script
+  apt:
+    name: curl
+    state: present
+
+- name: Create Bitcoin Knots health check script
+  ansible.builtin.template:
+    src: healthcheck.sh.j2
+    dest: /usr/local/bin/bitcoin-knots-healthcheck-push.sh
+    owner: root
+    group: root
+    mode: '0755'
+    validate: "bash -n %s"
+
+- name: Create systemd service for Bitcoin Knots health check
+  ansible.builtin.template:
+    src: healthcheck.service.j2
+    dest: /etc/systemd/system/bitcoin-knots-healthcheck.service
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Create systemd timer for Bitcoin Knots health check
+  ansible.builtin.template:
+    src: healthcheck.timer.j2
+    dest: /etc/systemd/system/bitcoin-knots-healthcheck.timer
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Reload systemd daemon for health check
+  systemd:
+    daemon_reload: yes
+
+- name: Enable and restart the Bitcoin Knots health check timer
+  systemd:
+    name: bitcoin-knots-healthcheck.timer
+    enabled: yes
+    state: restarted
+    daemon_reload: yes
+
+# Runs the check once, which is both a smoke test and the thing that actually
+# arms the timer. This timer is OnBootSec + OnUnitActiveSec with no OnCalendar:
+# OnBootSec elapses once, and OnUnitActiveSec needs the SERVICE to have run this
+# boot to have anything to schedule from. Restarting the timer does not supply
+# that reference; running the service does. The live timer had last fired on
+# 2026-08-09 while still reporting `active` and `enabled`.
+- name: Run the Bitcoin Knots health check once to arm the timer
+  command: systemctl start bitcoin-knots-healthcheck.service
+  changed_when: false

ansible/roles/bitcoin_knots/tasks/install.yml

@@ -0,0 +1,104 @@
+---
+- name: Calculate dbcache as a share of system RAM
+  set_fact:
+    bitcoin_dbcache_mb: "{{ (ansible_memtotal_mb | float * 0.9) | int }}"
+  when: bitcoin_dbcache_mb_override | string | length == 0
+
+- name: Use the explicit dbcache override
+  set_fact:
+    bitcoin_dbcache_mb: "{{ bitcoin_dbcache_mb_override }}"
+  when: bitcoin_dbcache_mb_override | string | length > 0
+  changed_when: false
+
+- name: Display calculated dbcache value
+  debug:
+    msg: "Setting dbcache to {{ bitcoin_dbcache_mb }} MB (90% of {{ ansible_memtotal_mb }} MB total RAM)"
+
+
+- name: Install build dependencies
+  apt:
+    name:
+      - build-essential
+      - libtool
+      - autotools-dev
+      - automake
+      - pkg-config
+      - bsdmainutils
+      - python3
+      - python3-pip
+      - libevent-dev
+      - libboost-system-dev
+      - libboost-filesystem-dev
+      - libboost-test-dev
+      - libboost-thread-dev
+      - libboost-chrono-dev
+      - libboost-program-options-dev
+      - libboost-dev
+      - libssl-dev
+      - libdb-dev
+      - libminiupnpc-dev
+      - libzmq3-dev
+      - libnatpmp-dev
+      - libsqlite3-dev
+      - git
+      - curl
+      - wget
+      - cmake
+    state: present
+    update_cache: yes
+
+- name: Create bitcoin group
+  group:
+    name: "{{ bitcoin_group }}"
+    system: yes
+    state: present
+
+- name: Create bitcoin user
+  user:
+    name: "{{ bitcoin_user }}"
+    group: "{{ bitcoin_group }}"
+    system: yes
+    shell: /usr/sbin/nologin
+    home: "{{ bitcoin_data_dir }}"
+    create_home: yes
+    state: present
+
+- name: Create bitcoin-knots directory
+  file:
+    path: "{{ bitcoin_knots_dir }}"
+    state: directory
+    owner: root
+    group: root
+    mode: '0755'
+
+- name: Create bitcoin-knots source directory
+  file:
+    path: "{{ bitcoin_knots_source_dir }}"
+    state: directory
+    owner: root
+    group: root
+    mode: '0755'
+
+- name: Create bitcoin data directory (for config, logs, wallets)
+  file:
+    path: "{{ bitcoin_data_dir }}"
+    state: directory
+    owner: "{{ bitcoin_user }}"
+    group: "{{ bitcoin_group }}"
+    mode: '0750'
+
+- name: Create bitcoin large data directory (for blockchain)
+  file:
+    path: "{{ bitcoin_large_data_dir }}"
+    state: directory
+    owner: "{{ bitcoin_user }}"
+    group: "{{ bitcoin_group }}"
+    mode: '0750'
+
+- name: Create bitcoin config directory
+  file:
+    path: "{{ bitcoin_conf_dir }}"
+    state: directory
+    owner: root
+    group: root
+    mode: '0755'

ansible/roles/bitcoin_knots/tasks/main.yml

@@ -0,0 +1,8 @@
+---
+# import_tasks, not include_tasks: static imports stay visible to --list-tasks,
+# which is how this conversion was verified against the playbook it replaced.
+- ansible.builtin.import_tasks: install.yml
+- ansible.builtin.import_tasks: build.yml
+- ansible.builtin.import_tasks: configure.yml
+- ansible.builtin.import_tasks: service.yml
+- ansible.builtin.import_tasks: healthcheck.yml

ansible/roles/bitcoin_knots/tasks/service.yml

@@ -0,0 +1,37 @@
+---
+- name: Reload systemd daemon
+  systemd:
+    daemon_reload: yes
+
+- name: Enable and start bitcoind service
+  systemd:
+    name: bitcoind
+    enabled: yes
+    state: started
+
+- name: Wait for bitcoind RPC to be available
+  uri:
+    url: "http://{{ bitcoin_rpc_bind }}:{{ bitcoin_rpc_port }}"
+    method: POST
+    body_format: json
+    body:
+      jsonrpc: "1.0"
+      id: "healthcheck"
+      method: "getblockchaininfo"
+      params: []
+    user: "{{ bitcoin_rpc_user }}"
+    password: "{{ bitcoin_rpc_password }}"
+    status_code: 200
+    timeout: 10
+  register: rpc_check
+  until: rpc_check.status == 200
+  retries: 30
+  delay: 5
+  ignore_errors: yes
+
+- name: Display RPC connection status
+  debug:
+    msg: "Bitcoin Knots RPC is {{ 'available' if rpc_check.status == 200 else 'not yet available' }}"
+
+# ═════════════════════════════════════════════════════════════════════════
+# DEPRECATED — Uptime Kuma was decommissioned on 2026-09-11.

ansible/roles/bitcoin_knots/templates/bitcoin.conf.j2

@@ -0,0 +1,67 @@
+# Bitcoin Knots Configuration
+# Generated by Ansible
+
+# Data directory (blockchain storage)
+datadir={{ bitcoin_large_data_dir }}
+
+# RPC Configuration
+server=1
+rpcuser={{ bitcoin_rpc_user }}
+rpcpassword={{ bitcoin_rpc_password }}
+rpcbind={{ bitcoin_rpc_bind }}
+rpcport={{ bitcoin_rpc_port }}
+rpcallowip=0.0.0.0/0
+
+# Network Configuration
+listen=1
+port={{ bitcoin_p2p_port }}
+maxconnections={{ bitcoin_max_connections }}
+
+# Performance
+dbcache={{ bitcoin_dbcache_mb }}
+
+# Transaction Index (optional)
+{% if bitcoin_enable_txindex %}
+txindex=1
+{% endif %}
+
+{# The live node carries this comment and the template never produced it, so a
+   run would have silently deleted it. Harmless in itself, but matching it keeps
+   this task at `ok` - which means any future `changed` here is a real signal
+   rather than known noise. #}
+# Pruning (optional)
+
+# Logging
+logtimestamps=1
+{% if bitcoin_logfile %}
+logfile={{ bitcoin_logfile }}
+{% else %}
+printtoconsole=1
+{% endif %}
+
+# ZMQ Configuration
+{% if bitcoin_zmq_enabled | default(false) %}
+zmqpubrawblock={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_rawblock }}
+zmqpubrawtx={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_rawtx }}
+zmqpubhashblock={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_hashblock }}
+zmqpubhashtx={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_hashtx }}
+{% endif %}
+
+# Security
+disablewallet=1
+{% if bitcoin_datum_gateway_enabled %}
+
+{# These were hand-added on the node and were NOT in this template, so running
+   the playbook would have stripped them. blocknotify is how datum_gateway
+   learns a new block landed; without it solo mining keeps grinding on a stale
+   template - a silent failure that costs money rather than raising an error.
+   Kept as a Jinja comment so the explanation stays in the repo and out of the
+   deployed config. #}
+# Specific for DATUM gateway
+blockmaxsize={{ bitcoin_blockmaxsize }}
+blockmaxweight={{ bitcoin_blockmaxweight }}
+blocknotify={{ bitcoin_blocknotify }}
+maxmempool={{ bitcoin_maxmempool }}
+blockreconstructionextratxn={{ bitcoin_blockreconstructionextratxn }}
+
+{% endif %}

ansible/roles/bitcoin_knots/templates/bitcoind.service.j2

@@ -0,0 +1,17 @@
+[Unit]
+Description=Bitcoin Knots daemon
+After=network.target
+
+[Service]
+Type=simple
+User={{ bitcoin_user }}
+Group={{ bitcoin_group }}
+ExecStart={{ bitcoin_build_prefix }}/bin/bitcoind -conf={{ bitcoin_conf_dir }}/bitcoin.conf
+Restart=always
+RestartSec=10
+TimeoutStopSec=600
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target

ansible/roles/bitcoin_knots/templates/healthcheck.service.j2

@@ -0,0 +1,14 @@
+[Unit]
+Description=Bitcoin Knots Health Check
+After=network.target bitcoind.service
+
+[Service]
+Type=oneshot
+User=root
+ExecStart=/usr/local/bin/bitcoin-knots-healthcheck-push.sh
+Environment=HEALTHCHECK_PUSH_URL={{ healthcheck_push_url }}
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target

ansible/roles/bitcoin_knots/templates/healthcheck.sh.j2

@@ -0,0 +1,62 @@
+#!/bin/bash
+# Bitcoin Knots health check — managed by Ansible (roles/bitcoin_knots)
+#
+# The exit code is the answer and systemd keeps it:
+#     systemctl is-failed bitcoin-knots-healthcheck.service
+# Reporting anywhere else is optional and generic.
+#
+#
+
+RPC_HOST="{{ bitcoin_rpc_bind }}"
+RPC_PORT={{ bitcoin_rpc_port }}
+RPC_USER="{{ bitcoin_rpc_user }}"
+RPC_PASSWORD="{{ bitcoin_rpc_password }}"
+PUSH_URL="${HEALTHCHECK_PUSH_URL:-}"
+
+# Check if bitcoind RPC is responding
+check_bitcoind() {
+    local response
+    response=$(curl -s --max-time 30 \
+        --user "${RPC_USER}:${RPC_PASSWORD}" \
+        --data-binary '{"jsonrpc":"1.0","id":"healthcheck","method":"getblockchaininfo","params":[]}' \
+        --header 'Content-Type: application/json' \
+        "http://${RPC_HOST}:${RPC_PORT}" 2>&1)
+    
+    if [ $? -eq 0 ]; then
+        # Check if response contains a non-null error
+        # Successful responses have "error": null, failures have "error": {...}
+        if echo "$response" | grep -q '"error":null\|"error": null'; then
+            return 0
+        else
+            return 1
+        fi
+    else
+        return 1
+    fi
+}
+
+report() {
+    local status=$1
+    local msg=$2
+    
+    # No push URL is normal, not an error: the exit code below is still a
+    # complete answer for anything reading unit state.
+    [ -n "$PUSH_URL" ] || return 0
+    
+    # URL encode spaces in message
+    local encoded_msg="${msg// /%20}"
+    
+    if ! curl -s --max-time 10 --retry 2 -o /dev/null \
+        "${PUSH_URL}?status=${status}&msg=${encoded_msg}&ping="; then
+        return 1
+    fi
+}
+
+# Main health check
+if check_bitcoind; then
+    report "up" "OK"
+    exit 0
+else
+    report "down" "bitcoind RPC not responding"
+    exit 1
+fi

ansible/roles/bitcoin_knots/templates/healthcheck.timer.j2

@@ -0,0 +1,11 @@
+[Unit]
+Description=Bitcoin Knots Health Check Timer
+Requires=bitcoind.service
+
+[Timer]
+OnBootSec=1min
+OnUnitActiveSec=1min
+Persistent=true
+
+[Install]
+WantedBy=timers.target

ansible/services/bitcoin-knots/bitcoin_knots_vars.yml

@@ -1,38 +0,0 @@
-# Bitcoin Knots Configuration Variables
-
-# Version - REQUIRED: Specify exact version/tag to build
-bitcoin_knots_version: "v29.2.knots20251110"  # Must specify exact version/tag
-bitcoin_knots_version_short: "29.2.knots20251110"  # Version without 'v' prefix (for tarball URLs)
-
-# Directories
-bitcoin_knots_dir: /opt/bitcoin-knots
-bitcoin_knots_source_dir: "{{ bitcoin_knots_dir }}/source"
-bitcoin_data_dir: /var/lib/bitcoin  # Standard location for config, logs, wallets
-bitcoin_large_data_dir: /mnt/knots_data  # Custom location for blockchain data (blocks, chainstate)
-bitcoin_conf_dir: /etc/bitcoin
-
-# Network
-bitcoin_rpc_port: 8332
-bitcoin_p2p_port: 8333
-bitcoin_rpc_bind: "0.0.0.0"
-
-# Build options
-bitcoin_build_jobs: 4  # Parallel build jobs (-j flag), adjust based on CPU cores
-bitcoin_build_prefix: /usr/local
-
-# Configuration options
-bitcoin_enable_txindex: true  # Set to true if transaction index needed (REQUIRED for Electrum servers like Electrs/ElectrumX)
-bitcoin_max_connections: 125
-# dbcache will be calculated as 90% of host RAM automatically in playbook
-
-# ZMQ Configuration
-bitcoin_zmq_enabled: true
-bitcoin_zmq_bind: "tcp://0.0.0.0"
-bitcoin_zmq_port_rawblock: 28332
-bitcoin_zmq_port_rawtx: 28333
-bitcoin_zmq_port_hashblock: 28334
-bitcoin_zmq_port_hashtx: 28335
-
-# Service user
-bitcoin_user: bitcoin
-bitcoin_group: bitcoin

ansible/services/bitcoin-knots/deploy_bitcoin_knots_playbook.yml

@@ -1,3 +1,11 @@
+---
+# Bitcoin Knots: full node built from source, with PGP signature and SHA256
+# verification of the release tarball. The build is guarded by a binary-exists
+# check, so a converged host skips the whole 30-60 minute compile.
+#
+# The chain lives in bitcoin_large_data_dir (/mnt/knots_data, ~875 GB). Nothing
+# here touches it; the only `state: absent` tasks target the build tree under
+# /opt/bitcoin-knots and run only when the binary is missing.
 - name: Build and Deploy Bitcoin Knots from Source
   hosts: bitcoin
   become: yes
@@ -5,740 +13,12 @@
     - ../../infra_vars.yml
     - ../../services_config.yml
     - ../../infra_secrets.yml
-    - ./bitcoin_knots_vars.yml
   vars:
-    bitcoin_repo_url: "https://github.com/bitcoinknots/bitcoin.git"
+    # Preserves the push URL this check has been reporting to. The role knows
-    bitcoin_sigs_base_url: "https://raw.githubusercontent.com/bitcoinknots/guix.sigs/knots"
+    # nothing about Uptime Kuma — this is just "a URL that accepts a ping".
-    bitcoin_version_major: "{{ bitcoin_knots_version_short | regex_replace('^(\\d+)\\..*', '\\1') }}"
+    healthcheck_push_url: "{{ healthcheck_push_urls.bitcoin_knots | default('') }}"
-    bitcoin_source_tarball_url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz"
+  roles:
-    uptime_kuma_api_url: "https://{{ subdomains.uptime_kuma }}.{{ root_domain }}"
+    - bitcoin_knots
-
-  tasks:
-    - name: Calculate 90% of system RAM for dbcache
-      set_fact:
-        bitcoin_dbcache_mb: "{{ (ansible_memtotal_mb | float * 0.9) | int }}"
-      changed_when: false
-
-    - name: Display calculated dbcache value
-      debug:
-        msg: "Setting dbcache to {{ bitcoin_dbcache_mb }} MB (90% of {{ ansible_memtotal_mb }} MB total RAM)"
-
-
-    - name: Install build dependencies
-      apt:
-        name:
-          - build-essential
-          - libtool
-          - autotools-dev
-          - automake
-          - pkg-config
-          - bsdmainutils
-          - python3
-          - python3-pip
-          - libevent-dev
-          - libboost-system-dev
-          - libboost-filesystem-dev
-          - libboost-test-dev
-          - libboost-thread-dev
-          - libboost-chrono-dev
-          - libboost-program-options-dev
-          - libboost-dev
-          - libssl-dev
-          - libdb-dev
-          - libminiupnpc-dev
-          - libzmq3-dev
-          - libnatpmp-dev
-          - libsqlite3-dev
-          - git
-          - curl
-          - wget
-          - cmake
-        state: present
-        update_cache: yes
-
-    - name: Create bitcoin group
-      group:
-        name: "{{ bitcoin_group }}"
-        system: yes
-        state: present
-
-    - name: Create bitcoin user
-      user:
-        name: "{{ bitcoin_user }}"
-        group: "{{ bitcoin_group }}"
-        system: yes
-        shell: /usr/sbin/nologin
-        home: "{{ bitcoin_data_dir }}"
-        create_home: yes
-        state: present
-
-    - name: Create bitcoin-knots directory
-      file:
-        path: "{{ bitcoin_knots_dir }}"
-        state: directory
-        owner: root
-        group: root
-        mode: '0755'
-
-    - name: Create bitcoin-knots source directory
-      file:
-        path: "{{ bitcoin_knots_source_dir }}"
-        state: directory
-        owner: root
-        group: root
-        mode: '0755'
-
-    - name: Create bitcoin data directory (for config, logs, wallets)
-      file:
-        path: "{{ bitcoin_data_dir }}"
-        state: directory
-        owner: "{{ bitcoin_user }}"
-        group: "{{ bitcoin_group }}"
-        mode: '0750'
-
-    - name: Create bitcoin large data directory (for blockchain)
-      file:
-        path: "{{ bitcoin_large_data_dir }}"
-        state: directory
-        owner: "{{ bitcoin_user }}"
-        group: "{{ bitcoin_group }}"
-        mode: '0750'
-
-    - name: Create bitcoin config directory
-      file:
-        path: "{{ bitcoin_conf_dir }}"
-        state: directory
-        owner: root
-        group: root
-        mode: '0755'
-
-    - name: Check if bitcoind binary already exists
-      stat:
-        path: "{{ bitcoin_build_prefix }}/bin/bitcoind"
-      register: bitcoind_binary_exists
-      changed_when: false
-
-    - name: Install gnupg for signature verification
-      apt:
-        name: gnupg
-        state: present
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Import Luke Dashjr's Bitcoin Knots signing key
-      command: gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys 90C8019E36C2E964
-      register: key_import
-      changed_when: "'already in secret keyring' not in key_import.stdout and 'already in public keyring' not in key_import.stdout"
-      when: not bitcoind_binary_exists.stat.exists
-      failed_when: key_import.rc != 0
-
-    - name: Display imported key fingerprint
-      command: gpg --fingerprint 90C8019E36C2E964
-      register: key_fingerprint
-      changed_when: false
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Download SHA256SUMS file
-      get_url:
-        url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/SHA256SUMS"
-        dest: "/tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS"
-        mode: '0644'
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Download SHA256SUMS.asc signature file
-      get_url:
-        url: "https://bitcoinknots.org/files/{{ bitcoin_version_major }}.x/{{ bitcoin_knots_version_short }}/SHA256SUMS.asc"
-        dest: "/tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS.asc"
-        mode: '0644'
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Verify PGP signature on SHA256SUMS file
-      command: gpg --verify /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS.asc /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS
-      register: sha256sums_verification
-      changed_when: false
-      failed_when: false  # Don't fail here - check for 'Good signature' in next task
-      when: not bitcoind_binary_exists.stat.exists
-
-
-    - name: Display SHA256SUMS verification result
-      debug:
-        msg: "{{ sha256sums_verification.stdout_lines + sha256sums_verification.stderr_lines }}"
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Fail if SHA256SUMS signature verification failed
-      fail:
-        msg: "SHA256SUMS signature verification failed. Aborting build."
-      when: not bitcoind_binary_exists.stat.exists and ('Good signature' not in sha256sums_verification.stdout and 'Good signature' not in sha256sums_verification.stderr)
-
-    - name: Remove any existing tarball to force fresh download
-      file:
-        path: /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
-        state: absent
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Download Bitcoin Knots source tarball
-      get_url:
-        url: "{{ bitcoin_source_tarball_url }}"
-        dest: "/tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz"
-        mode: '0644'
-        validate_certs: yes
-        force: yes
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Calculate SHA256 checksum of downloaded tarball
-      command: sha256sum /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
-      register: tarball_checksum
-      changed_when: false
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Extract expected checksum from SHA256SUMS file
-      shell: grep "bitcoin-{{ bitcoin_knots_version_short }}.tar.gz" /tmp/bitcoin-knots-{{ bitcoin_knots_version_short }}-SHA256SUMS | awk '{print $1}'
-      register: expected_checksum
-      changed_when: false
-      when: not bitcoind_binary_exists.stat.exists
-      failed_when: expected_checksum.stdout == ""
-
-    - name: Display checksum comparison
-      debug:
-        msg:
-          - "Expected: {{ expected_checksum.stdout | trim }}"
-          - "Actual: {{ tarball_checksum.stdout.split()[0] }}"
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Verify tarball checksum matches SHA256SUMS
-      fail:
-        msg: "Tarball checksum mismatch! Expected {{ expected_checksum.stdout | trim }}, got {{ tarball_checksum.stdout.split()[0] }}"
-      when: not bitcoind_binary_exists.stat.exists and expected_checksum.stdout | trim != tarball_checksum.stdout.split()[0]
-
-    - name: Remove existing source directory if it exists (to force fresh extraction)
-      file:
-        path: "{{ bitcoin_knots_source_dir }}"
-        state: absent
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Remove extracted directory if it exists (from previous runs)
-      file:
-        path: "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}"
-        state: absent
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Extract verified source tarball
-      unarchive:
-        src: /tmp/bitcoin-{{ bitcoin_knots_version_short }}.tar.gz
-        dest: "{{ bitcoin_knots_dir }}"
-        remote_src: yes
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Check if extracted directory exists
-      stat:
-        path: "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}"
-      register: extracted_dir_stat
-      changed_when: false
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Rename extracted directory to expected name
-      command: mv "{{ bitcoin_knots_dir }}/bitcoin-{{ bitcoin_knots_version_short }}" "{{ bitcoin_knots_source_dir }}"
-      when: not bitcoind_binary_exists.stat.exists and extracted_dir_stat.stat.exists
-
-    - name: Check if CMakeLists.txt exists
-      stat:
-        path: "{{ bitcoin_knots_source_dir }}/CMakeLists.txt"
-      register: cmake_exists
-      changed_when: false
-      when: not bitcoind_binary_exists.stat.exists
-
-    - name: Create CMake build directory
-      file:
-        path: "{{ bitcoin_knots_source_dir }}/build"
-        state: directory
-        mode: '0755'
-      when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
-
-    - name: Configure Bitcoin Knots build with CMake
-      command: >
-        cmake
-        -DCMAKE_INSTALL_PREFIX={{ bitcoin_build_prefix }}
-        -DBUILD_BITCOIN_WALLET=OFF
-        -DCMAKE_BUILD_TYPE=Release
-        -DWITH_ZMQ=ON
-        ..
-      args:
-        chdir: "{{ bitcoin_knots_source_dir }}/build"
-      when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
-      register: configure_result
-      changed_when: true
-
-    - name: Verify CMake enabled ZMQ
-      shell: |
-        set -e
-        cd "{{ bitcoin_knots_source_dir }}/build"
-        cmake -LAH .. | grep -iE 'ZMQ|WITH_ZMQ|ENABLE_ZMQ|USE_ZMQ'
-      when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
-      register: zmq_check
-      changed_when: false
-
-    - name: Fail if CMakeLists.txt not found
-      fail:
-        msg: "CMakeLists.txt not found in {{ bitcoin_knots_source_dir }}. Cannot build Bitcoin Knots."
-      when: not bitcoind_binary_exists.stat.exists and not (cmake_exists.stat.exists | default(false))
-
-    - name: Build Bitcoin Knots with CMake (this may take 30-60+ minutes)
-      command: cmake --build . -j{{ bitcoin_build_jobs }}
-      args:
-        chdir: "{{ bitcoin_knots_source_dir }}/build"
-      when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
-      async: 3600
-      poll: 0
-      register: build_result
-      changed_when: true
-
-    - name: Check build status
-      async_status:
-        jid: "{{ build_result.ansible_job_id }}"
-      register: build_job_result
-      until: build_job_result.finished
-      retries: 120
-      delay: 60
-      when: not bitcoind_binary_exists.stat.exists and build_result.ansible_job_id is defined
-
-    - name: Fail if build failed
-      fail:
-        msg: "Bitcoin Knots build failed: {{ build_job_result.msg }}"
-      when: not bitcoind_binary_exists.stat.exists and build_result.ansible_job_id is defined and build_job_result.failed | default(false)
-
-    - name: Install Bitcoin Knots binaries
-      command: cmake --install .
-      args:
-        chdir: "{{ bitcoin_knots_source_dir }}/build"
-      when: not bitcoind_binary_exists.stat.exists and cmake_exists.stat.exists | default(false)
-      changed_when: true
-
-    - name: Verify bitcoind binary exists
-      stat:
-        path: "{{ bitcoin_build_prefix }}/bin/bitcoind"
-      register: bitcoind_installed
-      changed_when: false
-
-    - name: Verify bitcoin-cli binary exists
-      stat:
-        path: "{{ bitcoin_build_prefix }}/bin/bitcoin-cli"
-      register: bitcoin_cli_installed
-      changed_when: false
-
-    - name: Fail if binaries not found
-      fail:
-        msg: "Bitcoin Knots binaries not found after installation"
-      when: not bitcoind_installed.stat.exists or not bitcoin_cli_installed.stat.exists
-
-    - name: Create bitcoin.conf configuration file
-      copy:
-        dest: "{{ bitcoin_conf_dir }}/bitcoin.conf"
-        content: |
-          # Bitcoin Knots Configuration
-          # Generated by Ansible
-
-          # Data directory (blockchain storage)
-          datadir={{ bitcoin_large_data_dir }}
-
-          # RPC Configuration
-          server=1
-          rpcuser={{ bitcoin_rpc_user }}
-          rpcpassword={{ bitcoin_rpc_password }}
-          rpcbind={{ bitcoin_rpc_bind }}
-          rpcport={{ bitcoin_rpc_port }}
-          rpcallowip=0.0.0.0/0
-
-          # Network Configuration
-          listen=1
-          port={{ bitcoin_p2p_port }}
-          maxconnections={{ bitcoin_max_connections }}
-
-          # Performance
-          dbcache={{ bitcoin_dbcache_mb }}
-
-          # Transaction Index (optional)
-          {% if bitcoin_enable_txindex %}
-          txindex=1
-          {% endif %}
-
-          # Logging (to journald via systemd)
-          logtimestamps=1
-          printtoconsole=1
-
-          # ZMQ Configuration
-          {% if bitcoin_zmq_enabled | default(false) %}
-          zmqpubrawblock={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_rawblock }}
-          zmqpubrawtx={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_rawtx }}
-          zmqpubhashblock={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_hashblock }}
-          zmqpubhashtx={{ bitcoin_zmq_bind }}:{{ bitcoin_zmq_port_hashtx }}
-          {% endif %}
-
-          # Security
-          disablewallet=1
-        owner: "{{ bitcoin_user }}"
-        group: "{{ bitcoin_group }}"
-        mode: '0640'
-      notify: Restart bitcoind
-
-    - name: Create systemd service file for bitcoind
-      copy:
-        dest: /etc/systemd/system/bitcoind.service
-        content: |
-          [Unit]
-          Description=Bitcoin Knots daemon
-          After=network.target
-
-          [Service]
-          Type=simple
-          User={{ bitcoin_user }}
-          Group={{ bitcoin_group }}
-          ExecStart={{ bitcoin_build_prefix }}/bin/bitcoind -conf={{ bitcoin_conf_dir }}/bitcoin.conf
-          Restart=always
-          RestartSec=10
-          TimeoutStopSec=600
-          StandardOutput=journal
-          StandardError=journal
-
-          [Install]
-          WantedBy=multi-user.target
-        owner: root
-        group: root
-        mode: '0644'
-      notify: Restart bitcoind
-
-    - name: Reload systemd daemon
-      systemd:
-        daemon_reload: yes
-
-    - name: Enable and start bitcoind service
-      systemd:
-        name: bitcoind
-        enabled: yes
-        state: started
-
-    - name: Wait for bitcoind RPC to be available
-      uri:
-        url: "http://{{ bitcoin_rpc_bind }}:{{ bitcoin_rpc_port }}"
-        method: POST
-        body_format: json
-        body:
-          jsonrpc: "1.0"
-          id: "healthcheck"
-          method: "getblockchaininfo"
-          params: []
-        user: "{{ bitcoin_rpc_user }}"
-        password: "{{ bitcoin_rpc_password }}"
-        status_code: 200
-        timeout: 10
-      register: rpc_check
-      until: rpc_check.status == 200
-      retries: 30
-      delay: 5
-      ignore_errors: yes
-
-    - name: Display RPC connection status
-      debug:
-        msg: "Bitcoin Knots RPC is {{ 'available' if rpc_check.status == 200 else 'not yet available' }}"
-
-    # ═════════════════════════════════════════════════════════════════════════
-    # DEPRECATED — Uptime Kuma was decommissioned on 2026-09-11.
-    #
-    # Every task below is inert: uptime_kuma_enabled is false in
-    # group_vars/all/main.yml, so they all skip and the deployment above still
-    # runs normally. Kept because the health-check logic is the durable part —
-    # when a replacement exists, rewire the push transport and flip the flag.
-    #
-    # What was being monitored: archive/uptime_kuma/MONITORS.md
-    # ═════════════════════════════════════════════════════════════════════════
-    - name: Create Bitcoin Knots health check and push script
-      when: uptime_kuma_enabled | default(false)
-      copy:
-        dest: /usr/local/bin/bitcoin-knots-healthcheck-push.sh
-        content: |
-          #!/bin/bash
-          #
-          # Bitcoin Knots Health Check and Push to Uptime Kuma
-          # Checks if bitcoind RPC is responding and pushes status to Uptime Kuma
-          #
-
-          RPC_HOST="{{ bitcoin_rpc_bind }}"
-          RPC_PORT={{ bitcoin_rpc_port }}
-          RPC_USER="{{ bitcoin_rpc_user }}"
-          RPC_PASSWORD="{{ bitcoin_rpc_password }}"
-          UPTIME_KUMA_PUSH_URL="${UPTIME_KUMA_PUSH_URL}"
-
-          # Check if bitcoind RPC is responding
-          check_bitcoind() {
-              local response
-              response=$(curl -s --max-time 30 \
-                  --user "${RPC_USER}:${RPC_PASSWORD}" \
-                  --data-binary '{"jsonrpc":"1.0","id":"healthcheck","method":"getblockchaininfo","params":[]}' \
-                  --header 'Content-Type: application/json' \
-                  "http://${RPC_HOST}:${RPC_PORT}" 2>&1)
-              
-              if [ $? -eq 0 ]; then
-                  # Check if response contains a non-null error
-                  # Successful responses have "error": null, failures have "error": {...}
-                  if echo "$response" | grep -q '"error":null\|"error": null'; then
-                      return 0
-                  else
-                      return 1
-                  fi
-              else
-                  return 1
-              fi
-          }
-
-          # Push status to Uptime Kuma
-          push_to_uptime_kuma() {
-              local status=$1
-              local msg=$2
-              
-              if [ -z "$UPTIME_KUMA_PUSH_URL" ]; then
-                  echo "ERROR: UPTIME_KUMA_PUSH_URL not set"
-                  return 1
-              fi
-              
-              # URL encode spaces in message
-              local encoded_msg="${msg// /%20}"
-              
-              if ! curl -s --max-time 10 --retry 2 -o /dev/null \
-                  "${UPTIME_KUMA_PUSH_URL}?status=${status}&msg=${encoded_msg}&ping="; then
-                  echo "ERROR: Failed to push to Uptime Kuma"
-                  return 1
-              fi
-          }
-
-          # Main health check
-          if check_bitcoind; then
-              push_to_uptime_kuma "up" "OK"
-              exit 0
-          else
-              push_to_uptime_kuma "down" "bitcoind RPC not responding"
-              exit 1
-          fi
-        owner: root
-        group: root
-        mode: '0755'
-
-    - name: Install curl for health check script
-      apt:
-        name: curl
-        state: present
-
-    - name: Create systemd timer for Bitcoin Knots health check
-      copy:
-        dest: /etc/systemd/system/bitcoin-knots-healthcheck.timer
-        content: |
-          [Unit]
-          Description=Bitcoin Knots Health Check Timer
-          Requires=bitcoind.service
-
-          [Timer]
-          OnBootSec=1min
-          OnUnitActiveSec=1min
-          Persistent=true
-
-          [Install]
-          WantedBy=timers.target
-        owner: root
-        group: root
-        mode: '0644'
-
-    - name: Create systemd service for Bitcoin Knots health check
-      when: uptime_kuma_enabled | default(false)
-      copy:
-        dest: /etc/systemd/system/bitcoin-knots-healthcheck.service
-        content: |
-          [Unit]
-          Description=Bitcoin Knots Health Check and Push to Uptime Kuma
-          After=network.target bitcoind.service
-
-          [Service]
-          Type=oneshot
-          User=root
-          ExecStart=/usr/local/bin/bitcoin-knots-healthcheck-push.sh
-          Environment=UPTIME_KUMA_PUSH_URL=
-          StandardOutput=journal
-          StandardError=journal
-
-          [Install]
-          WantedBy=multi-user.target
-        owner: root
-        group: root
-        mode: '0644'
-
-    - name: Reload systemd daemon for health check
-      systemd:
-        daemon_reload: yes
-
-    - name: Enable and start Bitcoin Knots health check timer
-      systemd:
-        name: bitcoin-knots-healthcheck.timer
-        enabled: yes
-        state: started
-
-    - name: Create Uptime Kuma push monitor setup script for Bitcoin Knots
-      when: uptime_kuma_enabled | default(false)
-      delegate_to: localhost
-      become: no
-      copy:
-        dest: /tmp/setup_bitcoin_knots_monitor.py
-        content: |
-          #!/usr/bin/env python3
-          import sys
-          import traceback
-          import yaml
-          from uptime_kuma_api import UptimeKumaApi, MonitorType
-          
-          try:
-              # Load configs
-              with open('/tmp/ansible_config.yml', 'r') as f:
-                  config = yaml.safe_load(f)
-              
-              url = config['uptime_kuma_url']
-              username = config['username']
-              password = config['password']
-              monitor_name = config['monitor_name']
-              
-              # Connect to Uptime Kuma
-              api = UptimeKumaApi(url, timeout=30)
-              api.login(username, password)
-              
-              # Get all monitors
-              monitors = api.get_monitors()
-              
-              # Find or create "services" group
-              group = next((m for m in monitors if m.get('name') == 'services' and m.get('type') == 'group'), None)
-              if not group:
-                  group_result = api.add_monitor(type='group', name='services')
-                  # Refresh to get the group with id
-                  monitors = api.get_monitors()
-                  group = next((m for m in monitors if m.get('name') == 'services' and m.get('type') == 'group'), None)
-              
-              # Check if monitor already exists
-              existing_monitor = None
-              for monitor in monitors:
-                  if monitor.get('name') == monitor_name:
-                      existing_monitor = monitor
-                      break
-              
-              # Get ntfy notification ID
-              notifications = api.get_notifications()
-              ntfy_notification_id = None
-              for notif in notifications:
-                  if notif.get('type') == 'ntfy':
-                      ntfy_notification_id = notif.get('id')
-                      break
-              
-              if existing_monitor:
-                  print(f"Monitor '{monitor_name}' already exists (ID: {existing_monitor['id']})")
-                  push_token = existing_monitor.get('pushToken') or existing_monitor.get('push_token')
-                  if not push_token:
-                      raise ValueError("Could not find push token for monitor")
-                  push_url = f"{url}/api/push/{push_token}"
-                  print(f"Push URL: {push_url}")
-              else:
-                  print(f"Creating push monitor '{monitor_name}'...")
-                  api.add_monitor(
-                      type=MonitorType.PUSH,
-                      name=monitor_name,
-                      parent=group['id'],
-                      interval=60,
-                      maxretries=3,
-                      retryInterval=60,
-                      notificationIDList={ntfy_notification_id: True} if ntfy_notification_id else {}
-                  )
-                  monitors = api.get_monitors()
-                  new_monitor = next((m for m in monitors if m.get('name') == monitor_name), None)
-                  if new_monitor:
-                      push_token = new_monitor.get('pushToken') or new_monitor.get('push_token')
-                      if not push_token:
-                          raise ValueError("Could not find push token for new monitor")
-                      push_url = f"{url}/api/push/{push_token}"
-                      print(f"Push URL: {push_url}")
-              
-              api.disconnect()
-              print("SUCCESS")
-              
-          except Exception as e:
-              error_msg = str(e) if str(e) else repr(e)
-              print(f"ERROR: {error_msg}", file=sys.stderr)
-              traceback.print_exc(file=sys.stderr)
-              sys.exit(1)
-        mode: '0755'
-
-    - name: Create temporary config for monitor setup
-      when: uptime_kuma_enabled | default(false)
-      delegate_to: localhost
-      become: no
-      copy:
-        dest: /tmp/ansible_config.yml
-        content: |
-          uptime_kuma_url: "{{ uptime_kuma_api_url }}"
-          username: "{{ uptime_kuma_username }}"
-          password: "{{ uptime_kuma_password }}"
-          monitor_name: "Bitcoin Knots"
-        mode: '0644'
-
-    - name: Run Uptime Kuma push monitor setup
-      when: uptime_kuma_enabled | default(false)
-      command: python3 /tmp/setup_bitcoin_knots_monitor.py
-      delegate_to: localhost
-      become: no
-      register: monitor_setup
-      changed_when: "'SUCCESS' in monitor_setup.stdout"
-      ignore_errors: yes
-
-    - name: Extract push URL from monitor setup output
-      set_fact:
-        uptime_kuma_push_url: "{{ monitor_setup.stdout | regex_search('Push URL: (https?://[^\\s]+)', '\\1') | first | default('') }}"
-      delegate_to: localhost
-      become: no
-      when: monitor_setup.stdout is defined
-
-    - name: Display extracted push URL
-      debug:
-        msg: "Uptime Kuma Push URL: {{ uptime_kuma_push_url }}"
-      when: uptime_kuma_push_url | default('') != ''
-
-    - name: Set push URL in systemd service environment
-      lineinfile:
-        path: /etc/systemd/system/bitcoin-knots-healthcheck.service
-        regexp: '^Environment=UPTIME_KUMA_PUSH_URL='
-        line: "Environment=UPTIME_KUMA_PUSH_URL={{ uptime_kuma_push_url }}"
-        state: present
-        insertafter: '^\[Service\]'
-      when: uptime_kuma_push_url | default('') != ''
-
-    - name: Reload systemd daemon after push URL update
-      systemd:
-        daemon_reload: yes
-      when: uptime_kuma_push_url | default('') != ''
-
-    - name: Restart health check timer to pick up new environment
-      systemd:
-        name: bitcoin-knots-healthcheck.timer
-        state: restarted
-      when: uptime_kuma_push_url | default('') != ''
-
-    - name: Clean up temporary files
-      when: uptime_kuma_enabled | default(false)
-      delegate_to: localhost
-      become: no
-      file:
-        path: "{{ item }}"
-        state: absent
-      loop:
-        - /tmp/setup_bitcoin_knots_monitor.py
-        - /tmp/ansible_config.yml
-
-  handlers:
-    - name: Restart bitcoind
-      when: uptime_kuma_enabled | default(false)
-      systemd:
-        name: bitcoind
-        state: restarted
-
 
 - name: Setup public Bitcoin P2P forwarding on the edge host
   hosts: edge
@@ -746,12 +26,6 @@
   vars_files:
     - ../../infra_vars.yml
     - ../../services_config.yml
-    - ../../infra_secrets.yml
-    - ./bitcoin_knots_vars.yml
-  vars:
-    bitcoin_tailscale_hostname: "knots-box"
-    uptime_kuma_api_url: "https://{{ subdomains.uptime_kuma }}.{{ root_domain }}"
-
   tasks:
     - name: Expose Bitcoin P2P through a socket proxy
       ansible.builtin.include_role:
@@ -759,134 +33,9 @@
       vars:
         socket_proxy_name: bitcoin-p2p
         socket_proxy_description: "Bitcoin P2P"
-        socket_proxy_listen_port: "{{ bitcoin_p2p_port }}"
+        socket_proxy_listen_port: "{{ service_settings.bitcoin.p2p_port }}"
-        socket_proxy_upstream_host: "{{ bitcoin_tailscale_hostname }}"
+        socket_proxy_upstream_host: "{{ service_settings.bitcoin.tailscale_hostname }}"
-        # These four were added by hand on vipy and were NOT in this playbook;
-        # writing the unit without them would have dropped FreeBind, which lets
-        # the socket bind before the address is up.
         socket_proxy_documentation: "https://github.com/bitcoin/bitcoin"
         socket_proxy_free_bind: true
         socket_proxy_timeout_stop_sec: 5
         socket_proxy_log_to_journal: true
-
-    - name: Display public endpoint
-      when: uptime_kuma_enabled | default(false)
-      debug:
-        msg: "Bitcoin P2P public endpoint: {{ ansible_host }}:{{ bitcoin_p2p_port }}"
-
-    # ===========================================
-    # Uptime Kuma TCP Monitor for Public P2P
-    # ===========================================
-    - name: Create Uptime Kuma TCP monitor setup script for Bitcoin P2P
-      when: uptime_kuma_enabled | default(false)
-      delegate_to: localhost
-      become: no
-      copy:
-        dest: /tmp/setup_bitcoin_p2p_tcp_monitor.py
-        content: |
-          #!/usr/bin/env python3
-          import sys
-          import traceback
-          import yaml
-          from uptime_kuma_api import UptimeKumaApi, MonitorType
-
-          try:
-              with open('/tmp/ansible_bitcoin_p2p_config.yml', 'r') as f:
-                  config = yaml.safe_load(f)
-
-              url = config['uptime_kuma_url']
-              username = config['username']
-              password = config['password']
-              monitor_host = config['monitor_host']
-              monitor_port = config['monitor_port']
-              monitor_name = config['monitor_name']
-
-              api = UptimeKumaApi(url, timeout=30)
-              api.login(username, password)
-
-              monitors = api.get_monitors()
-
-              # Find or create "services" group
-              group = next((m for m in monitors if m.get('name') == 'services' and m.get('type') == 'group'), None)
-              if not group:
-                  api.add_monitor(type='group', name='services')
-                  monitors = api.get_monitors()
-                  group = next((m for m in monitors if m.get('name') == 'services' and m.get('type') == 'group'), None)
-
-              # Check if monitor already exists
-              existing = next((m for m in monitors if m.get('name') == monitor_name), None)
-
-              # Get ntfy notification ID
-              notifications = api.get_notifications()
-              ntfy_notification_id = None
-              for notif in notifications:
-                  if notif.get('type') == 'ntfy':
-                      ntfy_notification_id = notif.get('id')
-                      break
-
-              if existing:
-                  print(f"Monitor '{monitor_name}' already exists (ID: {existing['id']})")
-                  print("Skipping - monitor already configured")
-              else:
-                  print(f"Creating TCP monitor '{monitor_name}'...")
-                  api.add_monitor(
-                      type=MonitorType.PORT,
-                      name=monitor_name,
-                      hostname=monitor_host,
-                      port=monitor_port,
-                      parent=group['id'],
-                      interval=60,
-                      maxretries=3,
-                      retryInterval=60,
-                      notificationIDList={ntfy_notification_id: True} if ntfy_notification_id else {}
-                  )
-
-              api.disconnect()
-              print("SUCCESS")
-
-          except Exception as e:
-              print(f"ERROR: {str(e)}", file=sys.stderr)
-              traceback.print_exc(file=sys.stderr)
-              sys.exit(1)
-        mode: '0755'
-
-    - name: Create temporary config for TCP monitor setup
-      when: uptime_kuma_enabled | default(false)
-      delegate_to: localhost
-      become: no
-      copy:
-        dest: /tmp/ansible_bitcoin_p2p_config.yml
-        content: |
-          uptime_kuma_url: "{{ uptime_kuma_api_url }}"
-          username: "{{ uptime_kuma_username }}"
-          password: "{{ uptime_kuma_password }}"
-          monitor_host: "{{ ansible_host }}"
-          monitor_port: {{ bitcoin_p2p_port }}
-          monitor_name: "Bitcoin Knots P2P Public"
-        mode: '0644'
-
-    - name: Run Uptime Kuma TCP monitor setup
-      when: uptime_kuma_enabled | default(false)
-      command: python3 /tmp/setup_bitcoin_p2p_tcp_monitor.py
-      delegate_to: localhost
-      become: no
-      register: tcp_monitor_setup
-      changed_when: "'SUCCESS' in tcp_monitor_setup.stdout"
-      ignore_errors: yes
-
-    - name: Display TCP monitor setup output
-      debug:
-        msg: "{{ tcp_monitor_setup.stdout_lines }}"
-      when: tcp_monitor_setup.stdout is defined
-
-    - name: Clean up TCP monitor temporary files
-      when: uptime_kuma_enabled | default(false)
-      delegate_to: localhost
-      become: no
-      file:
-        path: "{{ item }}"
-        state: absent
-      loop:
-        - /tmp/setup_bitcoin_p2p_tcp_monitor.py
-        - /tmp/ansible_bitcoin_p2p_config.yml
-

ansible/services_config.yml

@@ -46,6 +46,12 @@ service_settings:
     # from the edge host. A role default cannot serve the second play, so it
     # lives here rather than in roles/mempool/defaults.
     frontend_port: 8080
+  bitcoin:
+    # The P2P port is needed on two hosts: the bitcoin_knots role deploys the
+    # node on knots-box, and the socket-proxy play publishes the port from the
+    # edge host. A role default cannot reach that second play.
+    p2p_port: 8333
+    tailscale_hostname: knots-box
   fulcrum:
     # Same shape as mempool: the fulcrum role deploys on fulcrum-box, and the
     # socket-proxy play publishes the SSL port from the edge host. A role default