Modernized Koel config

koel/.env.example

@@ -12,7 +12,7 @@ DB_HOST=db
 DB_PORT=3306
 DB_DATABASE=koel
 DB_USERNAME=koel
-DB_PASSWORD=changeme
+DB_PASSWORD=koel
 
 # A random 32-char string. You can leave this empty if use php artisan koel:init.
 APP_KEY=

koel/docker-compose.yml

@@ -1,14 +1,22 @@
-version: '3.5'
+version: '2.4'
 
 services:
     app:
+        # This repository sadly only has a 'latest' flag
         image: 'hyzual/koel:latest'
         restart: 'always'
 
+        healthcheck:
+            test: 'curl -f localhost:80 || exit 1'
+            interval: '1m'
+            timeout: '10s'
+            retries: 3
+            start_period: '10s'
         depends_on:
-            - 'db'
+            db:
-        labels:
+                # Haven't found a good MySQL healthcheck yet
-            - 'com.centurylinklabs.watchtower.enable=true'
+                condition: 'service_started'
+
         networks:
             - 'default'
             - 'nginx'
@@ -18,17 +26,15 @@ services:
             - 'music:/music'
     
     db:
-        image: 'mysql:8'
+        image: 'mysql:8.0.24'
         restart: 'always'
         command: '--default-authentication-plugin=mysql_native_password'
 
         environment:
             - 'MYSQL_DATABASE=koel'
-            - 'MYSQL_PASSWORD=$DB_PASSWORD'
+            - 'MYSQL_USER=koel'
-            - 'MYSQL_ROOT_PASSWORD=$DB_PASSWORD'
+            - 'MYSQL_PASSWORD=koel'
-            - 'MYSQL_USER=$DB_USERNAME'
+            - 'MYSQL_RANDOM_ROOT_PASSWORD=yes'
-        labels:
-            - 'com.centurylinklabs.watchtower.enable=true'
         volumes:
             - 'db-data:/var/lib/mysql'