https://quicktasks.ismael.casimpan.com/tags/kubectl/Recent content in kubectl on IT QuicktasksHugo -- gohugo.ioCopyright © 2018–2022, Ismael Casimpan Jr.; All Rights ReservedSun, 28 Jun 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/change-default-cluster-in-kubernetes/Sun, 28 Jun 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/change-default-cluster-in-kubernetes/ If you have more than one cluster as illustrated in https://ismael.casimpan.com/quicktasks-k8s/list-nodes-in-kubernetes/, you can change it using command: 1kubectl config use-context <cluster_name_here> Use this command to verify the change: 1kubectl config get-contextshttps://quicktasks.ismael.casimpan.com/post/cluster-list-in-kubernetes/Sun, 28 Jun 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/cluster-list-in-kubernetes/ If you have a lot of kubernetes cluster, you will see the following: 1user@example:~$ kubectl config get-contexts 2CURRENT NAME CLUSTER AUTHINFO NAMESPACE 3* do-nyc1-kubernetes-tutorial do-nyc1-kubernetes-tutorial do-nyc1-kubernetes-tutorial-admin 4do-nyc3-infra do-nyc3-infra do-nyc3-infra-admin 5do-nyc2-devinfra do-nyc2-devinfra do-nyc2-devinfra-admin The one with asterisk (do-nyc1-kubernetes-tutorial) is your current cluster. So "kubectl" commands without specified cluster will default to it.https://quicktasks.ismael.casimpan.com/post/list-nodes-in-kubernetes/Sun, 28 Jun 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/list-nodes-in-kubernetes/ 1user@example:~$ kubectl get nodes 2NAME STATUS ROLES AGE VERSION 3pool-78osxtl1e3-3f4qg Ready <none> 72m v1.17.5 4pool-78osxtl1e3-3f4qw Ready <none> 71m v1.17.5https://quicktasks.ismael.casimpan.com/post/connection-to-server-refused/Sat, 27 Jun 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/connection-to-server-refused/ When you see similar error as below: 1user@example:~$ kubectl get nodes 2The connection to the server localhost:8080 was refused - did you specify the right host or port? Check for the "$KUBECONFIG" if set and "kubectl config view" output. Chances are, both are empty like below: 1user@example:~$ echo $KUBECONFIG 1user@example:~$ kubectl config view 2apiVersion: v1 3clusters: null 4contexts: null 5current-context: "" 6kind: Config 7preferences: {} 8users: null In this example, we're using the DOKS or DigitalOcean Managed Kubernetes.