diff --git a/.env.example b/.env.example
index fff8812b..4cc1a336 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,6 @@
+# docker image tag (latest, nightly)
+TAG=latest
+
 # set timezone to get correct log timestamp
 TZ=ETC/UTC
 
@@ -47,8 +50,12 @@ GODOXY_API_ADDR=127.0.0.1:8888
 # Frontend listening port
 GODOXY_FRONTEND_PORT=3000
 
-# Prometheus Metrics
-GODOXY_PROMETHEUS_ENABLED=true
+# Frontend aliases (subdomains / FQDNs, e.g. godoxy, godoxy.domain.com)
+GODOXY_FRONTEND_ALIASES=godoxy
+
+# Docker socket
+# /var/run/podman/podman.sock for podman
+DOCKER_SOCKET=/var/run/docker.sock
 
 # Debug mode
 GODOXY_DEBUG=false
\ No newline at end of file
diff --git a/compose.example.yml b/compose.example.yml
index b3ad32c7..acb49e3d 100755
--- a/compose.example.yml
+++ b/compose.example.yml
@@ -1,7 +1,7 @@
 ---
 services:
   frontend:
-    image: ghcr.io/yusing/godoxy-frontend:latest
+    image: ghcr.io/yusing/godoxy-frontend:${TAG:-latest}
     container_name: godoxy-frontend
     restart: unless-stopped
     network_mode: host # do not change this
@@ -13,7 +13,7 @@ services:
 
     # modify below to fit your needs
     labels:
-      proxy.aliases: godoxy
+      proxy.aliases: ${GODOXY_FRONTEND_ALIASES:-godoxy}
       proxy.godoxy.port: ${GODOXY_FRONTEND_PORT:-3000}
       # proxy.godoxy.middlewares.cidr_whitelist: |
       #   status: 403
@@ -24,13 +24,13 @@ services:
       #     - 192.168.0.0/16
       #     - 172.16.0.0/12
   app:
-    image: ghcr.io/yusing/godoxy:latest
+    image: ghcr.io/yusing/godoxy:${TAG:-latest}
     container_name: godoxy
     restart: always
     network_mode: host # do not change this
     env_file: .env
     volumes:
-      - /var/run/docker.sock:/var/run/docker.sock
+      - ${DOCKER_SOCKET:-/var/run/docker.sock}:/var/run/docker.sock
       - ./config:/app/config
       - ./logs:/app/logs
       - ./error_pages:/app/error_pages