Instructions on calibre-web.

calibre-web/docker-compose.yaml

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+version: "2.1"
+services:
+  calibre-web:
+    image: lscr.io/linuxserver/calibre-web:0.6.19
+    container_name: calibre-web
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - TZ=Europe/Madrid
+      - DOCKER_MODS=linuxserver/mods:universal-calibre #optional
+      - OAUTHLIB_RELAX_TOKEN_SCOPE=1 #optional
+    volumes:
+      - ${ROOT_PATH}/config:/config
+      - ${ROOT_PATH}/books:/books
+    ports:
+      - 8083:8083
+    restart: unless-stopped

calibre-web/readme.md

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+# Calibre-web
+
+- You can install with the attached docker-compose. You will only need to add a `.env` file to inform of the 
+  `ROOT_PATH` where the volumes should be mounted in the host.
+- Calibre-web is initially suposed to be a layer on top of an existing calibre installation. Because of that, the 
+  container does not initialize a books library on its own. This prevents the service from working properly (you will
+  get stuck in the first screen, being asked for a config and getting an error message constantly). To overcome this,
+  you simply need to drop an empty calibre database in the `/books` path in the container. A file you can use goes 
+  along with this readme file.
+- By default, you can't upload books through the web UI. You need to go to 
+ `Admin > Edit Basic Configuration > Feature Configuration > Enable Uploads`. After that, permission needs to be given
+  to every user who should be allowed to upload books.
+- The app allows OPDS connections from ebooks. To set it up, pass to the ebook the web URL with `/opds` at the end.
+- Books can easily exceed the default max upload size allowed by nginx. To increase it, you simply need to put the 
+  following directive under nginx's reverse proxy section for calibre: `client_max_body_size <your megabytes choice>M;`