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This article introduces you how to start K8S source code analysis, the content is very detailed, interested friends can refer to, hope to be helpful to you.

The process of starting Controller Manager is relatively simple, mainly by starting each controllers in turn.

The startup code is in / cmd/kube-controller-manager/app/controllermanager.go, and the core is the Run method:

/ / Run runs the CMServer. This should never exit.

Func Run (s * options.CMServer) error {

/ / 1. Verify CM configuration

If err: = s.Validate (KnownControllers (), ControllersDisabledByDefault.List ()); err! = nil {

Return err

}

....

KubeClient, leaderElectionClient, kubeconfig, err: = createClients (s)

If err! = nil {

Return err

}

Go startHTTP (s)

Recorder: = createRecorder (kubeClient)

/ / 2. Create controllers startup logic. Run is the function that is really used to start controllers

Run: = func (stop

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