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client-go/examples/leader-election/README.md
Mengjiang Bao c51c673cf8 chore(*): update election example (#82821) 
* feat(*): simplify leader election example

* chore(*): fix with comment

* chore(*): add os.exit

* chore(*): fix typo

Kubernetes-commit: 1185012da65edf802f22aff24141c0466a2a3ac8
2019-10-14 07:06:53 +00:00

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Leader Election Example

This example demonstrates how to use the leader election package.

Running

Run the following three commands in separate terminals. Each terminal needs a unique id.

# first terminal
go run main.go -kubeconfig=/path/to/kubeconfig -logtostderr=true -lease-lock-name=example -lease-lock-namespace=default -id=1

# second terminal
go run main.go -kubeconfig=/path/to/kubeconfig -logtostderr=true -lease-lock-name=example -lease-lock-namespace=default -id=2

# third terminal
go run main.go -kubeconfig=/path/to/kubeconfig -logtostderr=true -lease-lock-name=example -lease-lock-namespace=default -id=3

You can ignore the -kubeconfig flag if you are running these commands in the Kubernetes cluster.

Now kill the existing leader. You will see from the terminal outputs that one of the remaining two processes will be elected as the new leader.