Clustering Hazelcast on Kubernetes

I’ve had experience with clustering Hazelcast in Google Cloud Engine before, but right now, in the advent of containers, Kubernetes is becoming a standard for app/container orchestration and therefore my previous effort has become somewhat obsolete – unless you’re limited to VMs and have to use TCP-based clustering for Hazelcast, since multicast traffic may be blocked (it is on most cloud providers).

Given this, I’ve assembled a Dockerfile which will run a small app (hazelcast-kubernetes-bootstrapper) on boot. This app queries Kubernetes API to discover all nodes in the [Kubernetes] cluster that are acting as an Hazelcast node, retrieves their IP addresses, configures and instantiates Hazelcast with TCP configuration, accordingly.

Please test it and give me feedback. All you need is Docker and a Kubernetes cluster (I’ve tested it locally and in Google Container Engine).

More information, including step-by-step instructrion can be found at https://github.com/pires/hazelcast-kubernetes.

Cheers,
Paulo Pires

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