To be able to set your cluster you can do as follow:

kubectl config set-cluster k8s-cluster --server=${CLUSTER} [--insecure-skip-tls-verify=true] 

• --server=${CLUSTER} where ${CLUSTER} is your cluster adress
• --insecure-skip-tls-verify=true is used if you are using http over https

Then you need to set your context ( depending on your kubernetes configuration

kubectl config set-context k8s-context --cluster=k8s-cluster --namespace=${NS}

• --namespace=${NS} to specify the default namespace ( which skips the -n while typing kubectl commands for that namespace )

If you are using a RBAC, you might need to specify your user and pass your connection token or your login password:

For this advanced usage you can see the docs https://kubernetes.io/docs/reference/kubectl/cheatsheet/#kubectl-context-and-configuration

Now and finally to use your context you only have to:

kubectl config use-context ${USER}