Kubernetes Cheat Sheet
This page contains a list of commonly used kubectl commands and flags.
Kubectl apply - Creating objects
# create resource(s)
kubectl apply -f ./my-manifest.yaml
# create from multiple files
kubectl apply -f ./my1.yaml -f ./my2.yaml
# create resource(s) in all manifest files in dir
kubectl apply -f ./dir
# create resource(s) from url
kubectl apply -f https://git.io/vPieo
# create a Job which prints "Hello World"
kubectl create job hello --image=busybox:1.28 -- echo "Hello World"
# create a CronJob that prints "Hello World" every minute
kubectl create cronjob hello --image=busybox:1.28 --schedule="*/1 * * * *" -- echo "Hello World"
Viewing the Resources
# Get commands with basic output
kubectl get services
kubectl get pods --all-namespaces
kubectl get pods -o wide
kubectl get deployment my-dep
kubectl get pods
kubectl get pod my-pod -o yaml # Describe commands with verbose output
kubectl describe nodes my-node
kubectl describe pods my-pod
# List Services Sorted by Name
kubectl get services --sort-by=.metadata.name
# List pods Sorted by Restart Count
kubectl get pods --sort-by='.status.containerStatuses[0].restartCount'
# List PersistentVolumes sorted by capacity
kubectl get pv --sort-by=.spec.capacity.storage
# Get the version label of all pods with label app=cassandra
kubectl get pods --selector=app=cassandra -o \
jsonpath='{.items[*].metadata.labels.version}'
# Retrieve the value of a key with dots, e.g. 'ca.crt'
kubectl get configmap myconfig \
-o jsonpath='{.data.ca\.crt}'
# Retrieve a base64 encoded value with dashes instead of underscores.
kubectl get secret my-secret --template='{{index .data "key-name-with-dashes"}}'
# Get all worker nodes (use a selector to exclude results that have a label
# named 'node-role.kubernetes.io/control-plane')
kubectl get node --selector='!node-role.kubernetes.io/control-plane'
# Get all running pods in the namespace
kubectl get pods --field-selector=status.phase=Running
# Get ExternalIPs of all nodes
kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="ExternalIP")].address}'# List all containerIDs of initContainer of all pods
# Helpful when cleaning up stopped containers, while avoiding removal of initContainers.
kubectl get pods --all-namespaces -o jsonpath='{range .items[*].status.initContainerStatuses[*]}{.containerID}{"\n"}{end}' | cut -d/ -f3# List Events sorted by timestamp
kubectl get events --sort-by=.metadata.creationTimestamp
# List all warning events
kubectl events --types=Warning
# Compares the current state of the cluster against the state that the cluster would be in if the manifest was applied.
kubectl diff -f ./my-manifest.yaml
# Get a deployment's status subresource
kubectl get deployment nginx-deployment --subresource=status
Updating resources
# Rolling update "www" containers of "frontend" deployment, updating the image
kubectl set image deployment/frontend www=image:v2 # Check the history of deployments including the revision
kubectl rollout history deployment/frontend # Rollback to the previous deployment
kubectl rollout undo deployment/frontend # Rollback to a specific revision
kubectl rollout undo deployment/frontend --to-revision=2 # Watch rolling update status of "frontend" deployment until completion
kubectl rollout status -w deployment/frontend # Rolling restart of the "frontend" deployment
kubectl rollout restart deployment/frontend # Force replace, delete and then re-create the resource. Will cause a service outage.
kubectl replace --force -f ./pod.json# Create a service for a replicated nginx, which serves on port 80 and connects to the containers on port 8000
kubectl expose rc nginx --port=80 --target-port=8000Editing resources
# Edit the deploy file
kubectl edit deploy deploy.yaml Scaling resources
# Scale a replicaset named 'foo' to 3
kubectl scale --replicas=3 rs/foo# Scale a resource specified in "foo.yaml" to 3
kubectl scale --replicas=3 -f foo.yaml # If the deployment named mysql's current size is 2, scale mysql to 3
kubectl scale --current-replicas=2 --replicas=3 deployment/mysql # Scale multiple replication controllers
kubectl scale --replicas=5 rc/foo rc/bar rc/baz Deleting resources
# Delete a pod using the type and name specified in pod.json
kubectl delete -f ./pod.json # Delete a pod with no grace period
kubectl delete pod unwanted --now # Delete pods and services with same names "baz" and "foo"
kubectl delete pod,service baz foo # Delete pods and services with label name=myLabel
kubectl delete pods,services -l name=myLabel # Delete all pods and services in namespace my-ns,
kubectl -n my-ns delete pod,svc --all # Delete all pods matching the awk pattern1 or pattern2
kubectl get pods -n mynamespace --no-headers=true | awk '/pattern1|pattern2/{print $1}' | xargs kubectl delete -n mynamespace podInteracting with running Pods
kubectl logs my-pod
kubectl logs -l name=myLabel
kubectl logs my-pod --previous
kubectl logs my-pod -c my-container
kubectl logs my-pod -c my-container --previous
kubectl logs -f my-pod
kubectl logs -f my-pod -c my-container
kubectl logs -f -l name=myLabel --all-containers # Show metrics for a given pod and its containers
kubectl top pod POD_NAME --containers
kubectl top pod POD_NAME --sort-by=cpu Interacting with Deployments and Services
kubectl logs deploy/my-deployment
kubectl logs deploy/my-deployment -c my-container # listen on local port 5000 and forward to port 5000 on Service backend
kubectl port-forward svc/my-service 5000 # listen on local port 5000 and forward to Service target port with name <my-service-port>
kubectl port-forward svc/my-service 5000:my-service-port # listen on local port 5000 and forward to port 6000 on a Pod created by <my-deployment>
kubectl port-forward deploy/my-deployment 5000:6000 # run command in first Pod and first container in Deployment (single- or multi-container cases)
kubectl exec deploy/my-deployment -- ls Interacting with Nodes and cluster
# Mark my-node as unschedulable
kubectl cordon my-node # Drain my-node in preparation for maintenance
kubectl drain my-node # Mark my-node as schedulable
kubectl uncordon my-node # Show metrics for a given node
kubectl top node my-node # Display addresses of the master and services
kubectl cluster-info # Dump current cluster state to stdout
kubectl cluster-info dump # Dump current cluster state to /path/to/cluster-state
kubectl cluster-info dump --output-directory=/path/to/cluster-state Source : https://kubernetes.io/docs/reference/kubectl/cheatsheet/#updating-resources