Client-go: How to switch context

Created on 13 May 2017 · 8Comments · Source: kubernetes/client-go

I have searched everywhere and cannot figure out how to switch context in a configuration with multiple clusters.

Is there some way in code to be able to set the context that you want to use?

lifecyclrotten

Source

gamerscomplete

👍22

Most helpful comment

Try this

func buildConfigFromFlags(context, kubeconfigPath string) (*rest.Config, error) {
        return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
                &clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfigPath},
                &clientcmd.ConfigOverrides{
                        CurrentContext: context,
                }).ClientConfig()
}

ggaaooppeenngg on 6 Dec 2017

👍24 👎1

All 8 comments

Something like this?
https://github.com/kubernetes/kubernetes/blob/master/pkg/kubectl/cmd/config/use_context.go#L73

caesarxuchao on 1 Jun 2017

Try this

func buildConfigFromFlags(context, kubeconfigPath string) (*rest.Config, error) {
        return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
                &clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfigPath},
                &clientcmd.ConfigOverrides{
                        CurrentContext: context,
                }).ClientConfig()
}

ggaaooppeenngg on 6 Dec 2017

👍24 👎1

I came across this problem recently, I have multiple kubeconfig file, but I don't want to reload the files every time I change context. So I look in the client-go code and I do it this way.

config := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
           &clientcmd.ClientConfigLoadingRules{Precedence: kubeconfigFiles},
           &clientcmd.ConfigOverrides{})
clientapiConfig, err = config.RawConfig()  // save the result

// every time I need to change context do this
override := &clientcmd.ConfigOverrides{CurrentContext: contextName}
clientConfig := clientcmd.NewNonInteractiveClientConfig(clientapiConfig, override.CurrentContext, 
        override, &clientcmd.ClientConfigLoadingRules{})

It work for me, but not sure it's the right way.

daxzhuo on 3 Feb 2018

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

fejta-bot on 4 May 2018

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle rotten
/remove-lifecycle stale

fejta-bot on 3 Jun 2018

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/close

fejta-bot on 3 Jul 2018

the correct way goes through cmdclient.ModifyConfig, which takes care of config file locking etc...

here is my code:

func (k *K8s) SwitchContext(ctx string) (err error) {
    if k.RawConfig.Contexts[ctx] == nil {
        return fmt.Errorf("context %s doesn't exists", ctx)
    }
    k.RawConfig.CurrentContext = ctx
    err = clientcmd.ModifyConfig(clientcmd.NewDefaultPathOptions(), k.RawConfig, true)
    return
}