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K8s Cheat-sheet

  • Switch from minikube to gcloud and back:

    You can switch from local (minikube) to gcloud and back with:
kubectl config use-context CONTEXT_NAME
to list all contexts:
kubectl config get-contexts

  • List namespaces:

    kubectl get namespaces

  • Create namespace:

    kubectl create namespace <namespace name>

  • Delete namespace:

    kubectl delete namespaces <namespace name>

  • Get name of the current namespace:

    kubectl config view --minify --output 'jsonpath={..namespace}'; echo

  • Change the current namespace:

    kubectl config set-context --current --namespace=<NAME>

  • Minikube, reuse docker daemon:

    eval $(minikube docker-env)

  • Minkube dahsboard:

    minkube dashboard

  • Create new deployment object:

    kubectl create deployment app-name --image=divukman/app-name

  • Delete deployment:

    kubectl delete deployment app-image

  • Get deployments on cluster:

    kubect get deployments

  • Get pods:

    kubectl get pods

  • Expose a deployment with a service

    kubectl expose deployment deployment-name --type=LoadBalancer --port=8080

  • Get services:

    kubectl get services

  • Minikube only: Return URL to connect to the service:

    minikube service service-name

  • Scale deployment:

    kubectl scale deployment/deployment-name --replicas=3

  • Update deployment:

    kubectl set image deployment/deployment-name container_name=divukman/app-name:tag

  • Check deployment rollout status:

    kubectl rollout status deployment/deployment-name

  • Rollback deployment:

    kubectl rollout undo deployment/deployment-name
kubectl rollout undo deployment/deployment-name --to-revision=N

  • View deployment rollout history:

    kubectl rollout history deployment/deployment-name
kubectl rollout history deployment/deployment-name --revision=N

  • Delete service:

    kubectl delete service service-name

  • Delete deployment:

    kubectl delete deployment deployment-name

  • Create configmap

    • Create a new configmap named my-config with keys for each file in folder bar
    kubectl create configmap my-config --from-file=path/to/bar
    • Create a new configmap named my-config with specified keys instead of names on disk
    kubectl create configmap my-config --from-file=ssh-privatekey=~/.ssh/id_rsa --from-file=ssh-publickey=~/.ssh/id_rsa.pub
    • Create a new configMap named my-config with key1=config1 and key2=config2
    kubectl create configmap my-config --from-literal=key1=config1 --from-literal=key2=config2

  • Create a resource in a namespace:

    kubectl apply -f pod.yaml --namespace=test

  • Delete a resource in a namespace:

    kubectl delete -f pod.yaml --namespace=test

  • Create CronJob:

    kubectl create -f https://k8s.io/examples/application/job/cronjob.yaml

  • Get jobs:

    kubectl get jobs --watch

  • Delete cron job:

    kubectl delete cronjob hello

  • Dump pod logs (stdout):

    kubectl logs my-pod

Helm

  • Create a helm chart

    helm create hello-world

  • Lint, verify that your chart follows best practices

    helm lint

  • Dry run

    helm install --dry-run --debug

  • Package the chart to be able to distribute manually or through public or private chart repositories

    helm package ./hello-world
Successfully packaged chart and saved it to: \hello-world\hello-world-0.1.0.tgz

  • Auth:

    • Create service account with Artifact Registry role, create JSON key.
    cat /path/to/key/my_sa_key.json | helm registry login -u _json_key --password-stdin https://europe-west2-docker.pkg.dev

  • Push packaged artifact to Artifact Registry

    helm push my-chart-0.1.0.tgz oci://LOCATION-docker.pkg.dev/PROJECT/REPOSITORY