April 2018
Intermediate to advanced
468 pages
14h 34m
English
Content preview from Mastering Kubernetes - Second Edition
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Leader election for your application
Leader election can be very useful for your application too, but it is notoriously difficult to implement. Luckily, Kubernetes comes to the rescue. There is a documented procedure for supporting leader election for your application through the leader-elector container from Google. The basic concept is to use the Kubernetes endpoints combined with ResourceVersion and Annotations. When you couple this container as a sidecar in your application pod, you get leader-election capabilities in a very streamlined fashion.
Let's run the leader-elector container with three pods and an election called election:
> kubectl run leader-elector --image=gcr.io/google_containers/leader-elector:0.5 --replicas=3 -- --election=election ...
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