Useful Commands for Kubernetes

Cheatsheets

https://linuxacademy.com/site-content/uploads/2019/04/Kubernetes-Cheat-Sheet_07182019.pdf?x87162

General Commands

• Retrieve Kubernetes version

kubectl version

• Retrieve information about Kubernetes cluster

kubectl cluster-info

• Retrieve status of Kubernetes components

kubectl get componentstatuses

• Retrieve all Kubernetes resources in default namespace

kubectl get all

Infrastructure

• Retrieve Kubernetes node (host on which the cluster is deployed)

kubectl get nodes -o wide

Role Based Access Control (RBAC) Authorization

• Retrieve Kubernetes roles at cluster level

kubectl get clusterroles

• Retrieve Kubernetes role bindings at cluster level

kubectl get clusterrolebindings

• Retrieve Kubernetes roles at namespace level

kubectl get roles

• Retrieve Kubernetes role bindings at namespace level of all namespaces

kubectl get rolebindings -all-namespaces

• Retrieve description of a Kubernetes role binding at cluster level

kubectl describe clusterrolebinding cluster-admin

Running Containers

• Retrieve Kubernetes pods

kubectl get pods -o wide

kubectl get pods -n kube-system

• Retrieve Kubernetes replication controllers

kubectl get rc -o wide

• Retrieve Kubernetes deployments

kubectl get deployments -o wide

kubectl get deployments -o wide

• Retrieve Kubernetes services

kubectl get services -o wide

• Run a command into a running pod

kubectl exec –it <pod_name> -- /bin/sh

Manually Login to an external Kubernetes Cluster

https://blog.christianposta.com/kubernetes/logging-into-a-kubernetes-cluster-with-kubectl

kubectl config set-credentials <USER_ENTRY> --username=<USERNAME> --password=<PASSWORD> 
kubectl config set-cluster <CLUSTER_NAME> --insecure-skip-tls-verify=true --server=https://<IP_OF_KUBERNETES_API> 
kubectl config set-context <CONTEXT_NAME> --user=<USER_ENTRY> --namespace=<NAMESPACE> --cluster=<CLUSTER_NAME> 
kubectl config use-context <CONTEXT_NAME>