Cluster Introspection
kubectl get services # List all services kubectl get pods # List all pods kubectl get nodes -w # Watch nodes continuously kubectl version # Get version information kubectl cluster-info # Get cluster information kubectl config view # Get the configuration kubectl describe node <node> # Output information about a node
Pod and Container Introspection
kubectl get pods # List the current pods kubectl describe pod <name> # Describe pod <name> kubectl get rc # List the replication controllers kubectl get rc --namespace="<namespace>" # List the replication controllers in <namespace> kubectl describe rc <name> # Describe replication controller <name> kubectl get svc # List the services kubectl describe svc <name> # Describe service <name>
Interacting with Pods
kubectl run <name> --image=<image-name> # Launch a pod called <name>
# using image <image-name>
kubectl create -f <manifest.yaml> # Create a service described
# in <manifest.yaml>
kubectl scale --replicas=<count> rc <name> # Scale replication controller
# <name> to <count> instances
kubectl expose rc <name> --port=<external> --target-port=<internal> # Map port <external> to
# port <internal> on replication
# controller <name>
Stopping Kubernetes
kubectl delete pod <name> # Delete pod <name> kubectl delete rc <name> # Delete replication controller <name> kubectl delete svc <name> # Delete service <name> kubectl drain <n> --delete-local-data --force --ignore-daemonsets # Stop all pods on <n> kubectl delete node <name> # Remove <node> from the cluster
Debugging
kubectl exec <service> <command> [-c <$container>] # execute <command> on <service>, optionally
# selecting container <$container>
kubectl logs -f <name> [-c <$container>] # Get logs from service <name>, optionally
# selecting container <$container>
watch -n 2 cat /var/log/kublet.log # Watch the Kublet logs
kubectl top node # Show metrics for nodes
kubectl top pod # Show metrics for pods
Administration
kubeadm init # Initialize your master node kubeadm join --token <token> <master-ip>:<master-port> # Join a node to your Kubernetes cluster kubectl create namespace <namespace> # Create namespace <name> kubectl taint nodes --all node-role.kubernetes.io/master- # Allow Kubernetes master nodes to run pods kubeadm reset # Reset current state kubectl get secrets # List all secrets
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