How to run Hazelcast 3.11 with a group (cluster) name from Docker?

How do I run Hazelcast 3.11 version with a group name? In later versions there's an environment variable for that HZ_CLUSTERNAME but in 3.11 I can't find anything like it in documentation. This is how I'm trying to launch Hazelcast

docker run \
    -itd \
    --network hazelcast-network \
    --rm \
    -e HZ_CLUSTERNAME=default_groupname \
    -p 5701:5701 hazelcast/hazelcast:3.11.4

Also I tried to launch it like this

docker run \
    -itd \
    --network hazelcast-network \
    --rm \
    -v "$(pwd)"/hazelcastconf/:/mnt \
    -p 5701:5701 hazelcast/hazelcast:3.11.4 \
    java -Dhazelcast.config=/mnt/hazelcast.xml

with config as follows

<hazelcast xmlns="http://www.hazelcast.com/schema/config" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.hazelcast.com/schema/config http://www.hazelcast.com/schema/config/hazelcast-config-3.11.xsd">
    <group>
        <name>default_groupname</name>
    </group>
    <network>
        <port auto-increment="true" port-count="100">5701</port>
        <join>
            <multicast enabled="false"></multicast>
        </join>
    </network>
    <map name="sessions">
        <time-to-live-seconds>1000</time-to-live-seconds>
    </map>
</hazelcast>

Is there a way to properly set group name while launching it in Docker?

Solution

The configuration overriding was added in Hazelcast 4.1 (according to the Release Notes). Details on its usage are in the Reference Manual.

I suggest upgrading your Hazelcast version. If you don't want to upgrade or can't there is still a way to proceed with the problem in Hazelcast 3.11.z

The way to go is mapping a custom configuration file as the volume into the container as you've guessed.

One possible solution is to map the config file directly into the Hazelcast installation directory ("/opt/hazelcast").

docker run ... \
 -v "$(pwd)/hazelcastconf/hazelcast.xml:/opt/hazelcast/hazelcast.xml" \
 hazelcast/hazelcast:3.11.4

Or you can define the custom path in the JAVA_OPTS environment variable:

docker run ... \
 -v "$(pwd)/hazelcastconf:/mnt" \
 -e JAVA_OPTS=-Dhazelcast.config=/mnt/hazelcast.xml \
 hazelcast/hazelcast:3.11.4

The start command (CMD) in the Docker image changed over time and it's better to not touch it. ;)