New recipe: Nextcloud with MariaDB.

.recipes/nextcloud_mariadb/docker-compose.yml

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+# Nextcloud Server (stable) with MariaDB LTS
+#
+services:
+  # https://hub.docker.com/_/nextcloud
+  # https://github.com/docker-library/docs/tree/master/nextcloud
+  # https://github.com/nextcloud/server
+  nextcloud:
+    image: nextcloud:stable-apache
+    # Database must be accessible.
+    depends_on:
+      database:
+        condition: service_started
+    restart: unless-stopped
+    # Take a look the possible public port collision.
+    ports:
+      - 8201:80
+    links:
+      - database
+    volumes:
+      # Needs R/O UID:GID 33:33 (www-data:www-data).
+      - ./storage/volumes/nextcloud_init_d:/docker-entrypoint-hooks.d:ro
+      # Needs R/W UID:GID 33:33 (www-data:www-data).
+      - ./storage/volumes/nextcloud_html:/var/www/html
+      - ./storage/volumes/nextcloud_data:/wtkclouddata
+    environment:
+      MYSQL_HOST: database
+      MYSQL_DATABASE: nextcloud
+      MYSQL_USER: nextcloud
+      # Same as in MariaDB's configuration.
+      MYSQL_PASSWORD: secret-1
+      NEXTCLOUD_ADMIN_USER: admin
+      # E.g. https://www.avast.com/random-password-generator
+      NEXTCLOUD_ADMIN_PASSWORD: secret-3
+      # Fill in according to local settings.
+      #NEXTCLOUD_TRUSTED_DOMAINS: example.com, cloud.example.com
+      # These are required behind a reverse proxy.
+      APACHE_DISABLE_REWRITE_IP: 1
+      # Feel free to adapt to your Docker environment.
+      TRUSTED_PROXIES: 172.16.0.0/12
+      # If you force https on the reverse proxy (which is recommended).
+      #OVERWRITEPROTOCOL: https
+      # Optional context path.
+      #OVERWRITEWEBROOT: /nextcloud
+      # PHP settings.
+      PHP_MEMORY_LIMIT: 1024M
+      PHP_UPLOAD_LIMIT: 1024M
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    labels:
+      com.centurylinklabs.watchtower.enable: true
+  #
+  # https://hub.docker.com/_/mariadb
+  database:
+    image: mariadb:lts
+    restart: unless-stopped
+    # Only for migration or debugging.
+    #ports:
+    # - 3306:3306
+    volumes:
+      # Needs R/W UID:GID 999:999.
+      - ./storage/volumes/mysql:/var/lib/mysql
+      # Needs read UID 999.
+      - ./storage/volumes/mysql_conf_d:/etc/mysql/conf.d
+      - ./storage/volumes/mysql_init_d:/docker-entrypoint-initdb.d
+    environment:
+      MARIADB_AUTO_UPGRADE: "1"
+      MARIADB_INITDB_SKIP_TZINFO: "1"
+      MYSQL_DATABASE: nextcloud
+      MYSQL_USER: nextcloud
+      # E.g. https://www.avast.com/random-password-generator
+      MYSQL_PASSWORD: secret-1
+      MYSQL_ROOT_PASSWORD: secret-2
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    labels:
+      com.centurylinklabs.watchtower.enable: true