Using kubectl to manage multi clusters

The Kubernetes command-line tool, kubectl, allows you to run commands against Kubernetes clusters. You can use kubectl to deploy applications, inspect and manage cluster resources, and view logs. For more information including a complete list of kubectl operations, see the kubectl documentation.

In this tutorial, I want to share with you how to connect to multi Kubernetes Cluster by using kubectl on a computer.

For configuration, kubectl looks for a file named config in the $HOME/.kube directory. To show current configuration, you run command:

kubectl config view 

Result:

apiVersion: v1 clusters: - cluster: certificate-authority-data: DATA+OMITTED server: https://192.168.1.50:6443 name: cluster-one.me contexts: - context: cluster: cluster-one.me user: khoidn name: cluster-one.me current-context: cluster-one.me kind: Config preferences: {} users: - name: osbkca user: client-certificate-data: REDACTED client-key-data: REDACTED 

In above configuration, we have one cluster cluster-one.me. If you have another cluster cluster-second.me with file config at ~/.kube/cluster-second.config . Use the following commands to merge configuration files.

export KUBECONFIG=~/.kube/config:~/.kube/cluster-second.config kubectl config view --flatten > ~/.kube/config_temp mv ~/.kube/config_temp ~/.kube/config 

Now you run kubectl config get-contexts to see the differences.

CURRENT NAME CLUSTER AUTHINFO NAMESPACE * cluster-one.me cluster-one.me osbkca cluster-second.me cluster-sencond.me osbkca 

You can switch context of kubectl with the command kubeclt config use-context cluster-sencond.me

Wooow! Enjoy it. More info