Monday, 21 November 2011

Understanding HTTP plug-in failover in a clustered environment

This is another of my "file it away because I know it'll be useful in about 5 minutes time" links: -


Problem(Abstract)

After setting up the HTTP plug-in for load balancing in a clustered IBM® WebSphere® environment, the HTTP plug-in is not performing failover in a timely manner or at all when a cluster member becomes unavailable.

Cause

In most cases, the preceding behavior is observed because of a misunderstanding of how HTTP plug-in failover works or might be due to an improper configuration. Also, the type of Web server (multi-threaded versus single threaded) being used can affect this behaviour.

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Note to self - use kubectl to query images in a pod or deployment

In both cases, we use JSON ... For a deployment, we can do this: - kubectl get deployment foobar --namespace snafu --output jsonpath="{...