Monday, October 06, 2014

JGroups and Docker

I've uploaded an image with JGroups and a few demos to DockerHub [2].

The image is based on Fedora 20 and contains JGroups, plus a few scripts which run a chat demo, a distributed lock demo and a distributed counter demo.

To run this, it's as simple as executing

docker run -it belaban/jgroups

This will drop you into a bash shell and you're ready to run any of the three demos.

Start multiple containers and you have a cluster in which you can try out things, e.g. a cluster node acquiring a lock, another node trying to acquire it and blocking, the first node crashing and the second node finally acquiring the lock etc.

Note that this currently runs a cluster on one physical box. I'll still need to investigate what needs to be done to run Docker containers on different hosts and cluster them [3].

The Dockerfile is at [1] and can be used to derive another image from it, or to build the image locally.

[1] https://github.com/belaban/jgroups-docker

[2] https://registry.hub.docker.com/u/belaban/jgroups/

[3] https://issues.jboss.org/browse/JGRP-1840

6 comments:

  1. Physical box means on single IP (single JVM). How can provide multiple IPs while using UDP.xml

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  2. You can run multiple JVMs on the same box, but spanning multiple boxes hasn't been done yet. I guess that's more a missing feature of Docker than JGroups though...

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    Replies
    1. My requirement is using multiple IPs on multiple boxes using JGroups. How can I achieve those configuration. Please guide me.
      Thanks

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    2. It will be great if you can provide me your email id.
      my email id - cmtripathi@gmail.com

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    3. Hi Bela,

      Can you please suggest using JGroups how to write and run same application in multiple boxes as cluster.

      Thanks in advance,
      Hemant

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  3. Chandra: belaban at yahoo dot com, but I suggest post to the JGroups mailing lists for questions on JGroups.

    Hemant: what do you mean ? I also suggest the mailing list rather than the blog for questions on JGroups.

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