Using RABBITMQ_ERLANG_COOKIE to resolve "Cookie file /var/lib/rabbitmq/.erlang.cookie must be accessible by owner only"

Author: ramonsmits

.env

@@ -1,3 +1,4 @@
 RABBITMQ_DEFAULT_USER=guest
 RABBITMQ_DEFAULT_PASS=guest
-RABBITMQ_DEFAULT_VHOST=/
+RABBITMQ_DEFAULT_VHOST=/
+RABBITMQ_ERLANG_COOKIE=12345

.erlang.cookie

@@ -2,9 +2,6 @@
 
 set -e
 
-# Change .erlang.cookie permission
-chmod 400 /var/lib/rabbitmq/.erlang.cookie
-
 # Get hostname from enviromant variable
 HOSTNAME=`env hostname`
 echo "Starting RabbitMQ Server For host: " $HOSTNAME

cluster-entrypoint.sh

@@ -7,8 +7,8 @@ services:
       - RABBITMQ_DEFAULT_USER=${RABBITMQ_DEFAULT_USER}
       - RABBITMQ_DEFAULT_PASS=${RABBITMQ_DEFAULT_PASS}
       - RABBITMQ_DEFAULT_VHOST=${RABBITMQ_DEFAULT_VHOST}
+      - RABBITMQ_ERLANG_COOKIE=${RABBITMQ_ERLANG_COOKIE}
     volumes:
-      - ./.erlang.cookie:/var/lib/rabbitmq/.erlang.cookie
       - ./cluster-entrypoint.sh:/usr/local/bin/cluster-entrypoint.sh
     entrypoint: /usr/local/bin/cluster-entrypoint.sh
 
@@ -19,8 +19,8 @@ services:
       - rabbitmq1
     environment:
       - JOIN_CLUSTER_HOST=rabbitmq1
+      - RABBITMQ_ERLANG_COOKIE=${RABBITMQ_ERLANG_COOKIE}
     volumes:
-      - ./.erlang.cookie:/var/lib/rabbitmq/.erlang.cookie
       - ./cluster-entrypoint.sh:/usr/local/bin/cluster-entrypoint.sh
     entrypoint: /usr/local/bin/cluster-entrypoint.sh
 
@@ -31,8 +31,8 @@ services:
       - rabbitmq1
     environment:
       - JOIN_CLUSTER_HOST=rabbitmq1
+      - RABBITMQ_ERLANG_COOKIE=${RABBITMQ_ERLANG_COOKIE}
     volumes:
-      - ./.erlang.cookie:/var/lib/rabbitmq/.erlang.cookie
       - ./cluster-entrypoint.sh:/usr/local/bin/cluster-entrypoint.sh
     entrypoint: /usr/local/bin/cluster-entrypoint.sh