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

[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
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> 2026-09-13 18:13:40 +02:00			`[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`