mjramesh/kubernetes-cheat-sheet

kubernetes commands for easy reference

kubernetes-cheat-sheet

Basic commands

To find kubectl version

kubectl version

To list kubectl cluster information

kubectl cluster-info

To view nodes in the cluster

kubectl get nodes

To run app with kubernetes

kubectl run <appname> --image=<imagelocation> --p <portno>

To list deployments

kubectl get deployments

To list pods

kubectl get pods

To view containers and their details in the pod

kubectl describe pods

To list services

kubectl get services

To expose a service

kubectl expose

To view the label

kubectl describe deployment

To delete the service

kubectl delete service

Deployments

Deployment without YAML manifest:

kubectl create deployment <name> --image= <image>

Scale deployments:

kubectl scale deployment <deployment> --replicas=<number>

Rollout status:

kubectl rollout status deployment <deployment>

Rollout re-start:

kubectl rollout restart deployment <deployment>

Rollout history:

kubectl rollout history deployment <deployment>

Undo rollout:

kubectl rollout undo deploy <deployment> --to revision= <revision>

Services

Creating a service without a YAML manifest:

kubectl expose pod/deployment <name> --port x --target-port x

Showing labels:

kubectl get services --show-labels

Pods:

To execute command on pod

kubectl exec -ti $POD_NAME curl www.google.com

Provision a pod:

kubectl run <pod-name> --image=<image-name>--restart=Never

Commands to a running container:

kubectl exec -ti <pod-name> <command>

Specify a container:

kubectl exec -ti <pod-name> -c <container> sh

Secrets:

Creating a secret without a YAML manifest:

kubectl create secret generic <name> --from-literal=<key>=<value>

kubectl create secret generic <name> --from-file=key=./file.txt

Querying secret values via the CLI:

kubectl get secret <secret-name> -o jsonpath=”{.data.<key-name>}”

Contexts:

Get list of contexts

kubectl config get-contexts

Get the current context

kubectl config current-context <context-name>

Switch to current context

kubectl config use-context <context-name>

Logs

Print the logs for a pod

kubectl logs <pod_name>

Print the logs for the last hour for a pod

kubectl logs --since=1h <pod_name>

Print the logs for a container in a pod

kubectl logs -c <container_name> <pod_name>

View the logs for a previously failed pod

kubectl logs --previous <pod_name>

Events

List recent events for all resources in the system

kubectl get events

List Warnings only

kubectl get events --field-selector type=Warning

List events but exclude Pod events

kubectl get events --field-selector involvedObject.kind!=Pod

ReplicaSets

List ReplicaSets

kubectl get replicasets

Display the detailed state of one or more ReplicaSets

kubectl describe replicasets <replicaset_name>

Scale a ReplicaSet

kubectl scale --replicas=[count]

#Services

List one or more services

kubectl get services

Display the detailed state of a service

kubectl describe services

Expose a replication controller, service, deployment or pod as a new Kubernetes service

kubectl expose deployment [deployment_name]

Edit and update the definition of one or more services

kubectl edit services