This post contains a list of command to remember some basic operations for Kubernetes. It's not about explaining what Kubernetes is or how to use it, this is more about having a quick reference of useful commands you can use in your K8 clusters.
List info
// list replica sets
kubectl get rs
// list pods
kubectl get pods
// get running services (kubernetes and hw NodePort in the example)
kubectl get services
// more get commands
Kubectl get all
Kubectl get DEPLOY_NAME
Kubectl get DEPLOY_NAME -o yaml
// list deployments
kubectl get deployments
Basic commands
//logs
kubectl logs [pod name]
//get inside a pod
Kubectl exec -it [pod name] /bin/bash
// check if port is exposed for specific deployment
Kubectl expose deployment NAME --type=NodePort
// modify port
Kubectl expose deployment NAME --type=NodePort --port=80
Labels
// list labels
kubectl get pods --show-labels
// add label
kubectl label [pod name] [label]
kubectl label [pod name] [label] --overwrite
e.g.
kubectl label my-pod env=development
// remove label (add - at the end)
kubectl label [pod name] [label]-
// filter by label
kubectl get pods --selector [label-filter]
### examples:
kubectl get pods --selector env=production
// negate
kubectl get pods --selector env!=production
//version range
kubectl get pods -l 'release-version in (1.0, 2.0)' —show-labels
kubectl get pods -l 'release-version not in (1.0, 2.0)' —show-labels
// delete pods by label
kubectl delete pods -l 'state=disabled'
Deployments
// create deployment
kubectl create deployment NAME —image=DOCKER_IMAGE
// list deployments
kubectl get deployments
// change docker image for deployment
kubectl set image deployment/NAME CONTAINER_NAME=IMAGE
// history for deployments
kubectl rollout history deployment/NAME
// rever deployment
kubectl rollout undo deployment/NAME
kubectl rollout undo deployment/NAME —to-revision=X (base on history info)
// get deployment info
Kubectl describe deployment NAME
Image credits:
