dns.env file did not work out, env_file: element not being read before dns: element. Using folder-specific .env files instead, seems to be loaded before dns: element. Also move other values to the env files for better password privacy.

Config/Nextcloud/.env.example

@@ -0,0 +1,26 @@
+# Environment file for Nextcloud stack.
+
+## Nextcloud ##
+
+PHP_UPLOAD_LIMIT=5G
+
+## MySQL ##
+
+MYSQL_HOST=db
+MYSQL_DATABASE=nextcloud
+MYSQL_ROOT_PASSWORD=ChangeMe
+MYSQL_USER=nc
+MYSQL_PASSWORD=changeme
+
+## REDIS ##
+
+REDIS_HOST=redis
+REDIS_HOST_PASSWORD=someredispassword
+
+## Other ##
+
+# If you have both Nextcloud and OnlyOffice on the same internal network you
+#   will likely want to set this to an internal DNS server. Some routers will
+#   drop traffic if an internal IP tries to communicate with the WAN IP, causing
+#   the curl to OnlyOffice's /healthcheck to fail. Do the same in both configs.
+DNS=192.168.1.1

Config/Nextcloud/docker-compose.yml

@@ -16,17 +16,12 @@ services:
     command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
     volumes:
       - ../../Volumes/Nextcloud/mariadb:/var/lib/mysql
-    environment:
-      - MYSQL_ROOT_PASSWORD=ChangeMe
-      - MYSQL_DATABASE=nextcloud
-      - MYSQL_USER=nc
-      - MYSQL_PASSWORD=changeme
 
   redis:
     container_name: nc-redis
     image: redis
     restart: always
-    command: redis-server --requirepass someredispassword
+    command: redis-server --requirepass $REDIS_HOST_PASSWORD
 
   app:
     container_name: nc-app
@@ -39,16 +34,5 @@ services:
       - redis
     volumes:
       - ../../Volumes/Nextcloud/nextcloud:/var/www/html
-    env_file:
-      - ../../dns.env
-    environment:
-      - MYSQL_DATABASE=nextcloud
-      - MYSQL_USER=nc
-      - MYSQL_PASSWORD=changeme
-      - MYSQL_HOST=db
-      - PHP_UPLOAD_LIMIT=5G
-      - REDIS_HOST=redis
-      - REDIS_HOST_PASSWORD=someredispassword
     dns:
-      - "$DNS1"
-      - "$DNS2"
+      - "$DNS"