Fixed RabbitMQ directory ownership issues

Dockerfile

@@ -2,7 +2,8 @@ FROM rabbitmq:3.5.3-management
 MAINTAINER Dimitris Kapanidis [email protected]
 
 COPY rabbitmq-cluster /usr/local/bin/
+COPY pre-entrypoint.sh /
 
 EXPOSE 5672 15672 25672 4369 9100 9101 9102 9103 9104 9105
-USER rabbitmq
+ENTRYPOINT ["/pre-entrypoint.sh"]
 CMD ["rabbitmq-cluster"]

captain.yml

@@ -1,3 +1,3 @@
-build:
-  images:
-    Dockerfile: harbur/rabbitmq-cluster
+rabbitmq-cluster:
+  build: Dockerfile
+  image: harbur/rabbitmq-cluster

pre-entrypoint.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+mkdir -p /var/lib/rabbitmq
+
+if [ "$ERLANG_COOKIE" ]; then
+    cookieFile='/var/lib/rabbitmq/.erlang.cookie'
+    if [ -e "$cookieFile" ]; then
+        if [ "$(cat "$cookieFile" 2>/dev/null)" != "$ERLANG_COOKIE" ]; then
+            echo >&2
+            echo >&2 "warning: $cookieFile contents do not match ERLANG_COOKIE"
+            echo >&2
+        fi
+    else
+        echo "$ERLANG_COOKIE" > "$cookieFile"
+        chmod 600 "$cookieFile"
+        chown rabbitmq "$cookieFile"
+    fi
+fi
+
+chown rabbitmq:rabbitmq /var/lib/rabbitmq
+exec gosu rabbitmq ./docker-entrypoint.sh "$@"

rabbitmq-cluster

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-echo $ERLANG_COOKIE > /var/lib/rabbitmq/.erlang.cookie
-chmod 700 /var/lib/rabbitmq/.erlang.cookie
-
 hostname=`hostname`
 RABBITMQ_NODENAME=${RABBITMQ_NODENAME:-rabbit}