Kubernetes Commands CMDsheet

Cluster Management

kubectl cluster-info	Display endpoint information about the master and services in the cluster
kubectl version	Display the Kubernetes version running on the client and server
kubectl config view	Get the configuration of the cluster
kubectl api-resources	List the API resources that are available
kubectl api-versions	List the API versions that are available
kubectl get all –all-namespaces	List everything

Daemonsets(ds)

kubectl get daemonset	List one or more daemonsets
kubectl edit daemonset	Edit and update the definition of one or more daemonset
kubectl delete daemonset	Delete a daemonset
kubectl create daemonset	Create a new daemonset
kubectl rollout daemonset	Manage the rollout of a daemonset
kubectl describe ds -n	Display the detailed state of daemonsets within a namespace

Deployments(deploy)

kubectl get deployment	List one or more deployments
kubectl describe deployment	Display the detailed state of one or more deployments
kubectl edit deployment	Edit and update the definition of one or more deployment on the server
kubectl create deployment	Create one a new deployment
kubectl delete deployment	Delete deployments
kubectl rollout status deployment	See the rollout status of a deployment

• Options:

–image=image_name

Provide an image name

Events(ev)

kubectl get events	List recent events for all resources in the system
kubectl get events –field-selector type=Warning	List Warnings only
kubectl get events –field-selector involvedObject.kind!=Pod	List events but exclude Pod events
kubectl get events –field-selector involvedObject.kind=Node, involvedObject.name=	Pull events for a single node with a specific name
kubectl get events –field-selector type!=Normal	Filter out normal events from a list of events

Logs

kubectl logs	Print the logs for a pod
kubectl logs –since=1h	Print the logs for the last hour for a pod
kubectl logs –tail=20	Get the most recent 20 lines of logs
kubectl logs -f [-c <$container>]	Get logs from a service and optionally select which container
kubectl logs -f	Print the logs for a pod and follow new logs
kubectl logs -c	Print the logs for a container in a pod
kubectl logs pod.log	Output the logs for a pod into a file named ‘pod.log’
kubectl logs –previous	View the logs for a previously failed pod

kubetail

kubetail	Get logs for all pods named with pod_prefix
kubetail -s 5m	Include the most recent 5 minutes of logs

Manifest Files

kubectl apply -f manifest_file.yaml	Apply a configuration to an object by filename or stdin. Overrides the existing configuration.
kubectl create -f manifest_file.yaml	Create objects
kubectl create -f ./dir	Create objects in all manifest files in a directory
kubectl create -f ‘url’	Create objects from a URL
kubectl delete -f manifest_file.yaml	Delete an object

Namespaces(ns)

kubectl create namespace	Create namespace
kubectl get namespace	List one or more namespaces
kubectl delete namespace	Delete a namespace
kubectl describe namespace	Display the detailed state of one or more namespace
kubectl edit namespace	Edit and update the definition of a namespace
kubectl top namespace	Display Resource (CPU/Memory/Storage) usage for a namespace

Nodes(no)

kubectl taint node	Update the taints on one or more nodes
kubectl get node	List one or more nodes
kubectl delete node	Delete a node or multiple nodes
kubectl top node	Display Resource usage (CPU/Memory/Storage) for nodes
kubectl describe nodes | grep Allocated -A 5	Resource allocation per node
kubectl get pods -o wide | grep	Pods running on a node
kubectl annotate node	Annotate a node
kubectl cordon node	Mark a node as unschedulable
kubectl uncordon node	Mark node as schedulable
kubectl drain node	Drain a node in preparation for maintenance
kubectl label node	Add or update the labels of one or more nodes

Pods(po)

kubectl get pod	List one or more pod
kubectl delete pod	Delete a pod
kubectl describe pod	Display the detailed state of a pods
kubectl create pod	Create a pod
kubectl exec -c	Execute a command against a container in a pod
kubectl exec -it /bin/sh	Get interactive shell on a a single-container pod
kubectl top pod	Display Resource usage (CPU/Memory/Storage) for pods
kubectl annotate pod	Add or update the annotations of a pod
kubectl label pod	Add or update the label of a pod

Replication Controllers(rc)

kubectl get rc	List the replication controllers
kubectl get rc –namespace=””	List the replication controllers by namespace

ReplicaSets(rs)

kubectl get replicasets	List ReplicaSets
kubectl describe replicasets	Display the detailed state of one or more ReplicaSets
kubectl scale –replicas=[x]	Scale a ReplicaSet

Secrets

kubectl create secret	Create a secret
kubectl get secrets	List secrets
kubectl describe secrets	List details about secrets
kubectl delete secret	Delete a secret

Services(svc)

kubectl get services	List one or more services
kubectl describe services	Display the detailed state of a service
kubectl expose deployment [deployment_name]	Expose a replication controller, service, deployment or pod as a new Kubernetes service
kubectl edit services	Edit and update the definition of one or more services

Service Accounts(sa)

kubectl get serviceaccounts	List service accounts
kubectl describe serviceaccounts	Display the detailed state of one or more service accounts
kubectl replace serviceaccount	Replace a service account
kubectl delete serviceaccount	Delete a service account

StatefulSet(sts)

kubectl get statefulset	List StatefulSet
kubectl delete statefulset/[stateful_set_name] –cascade=false	Delete StatefulSet only (not pods)

Common Options

In Kubectl you can specify optional flags with commands. Here are some of the most common and useful ones.

-o	Output format	For example if you wanted to list all of the pods in ps output format with more information. kubectl get pods -o wide
-n	Shorthand for –namespace	For example, if you’d like to list all the Pods in a specific Namespace you would do this command: kubectl get pods -n=[namespace_name]
-f	Filename, directory, or URL to files to use to create a resource.	For example when creating a pod using data in a file named newpod.json. kubectl create -f ./newpod.json
-l	Selector to filter on, supports ‘=’, ‘==’, and ‘!=’.	Example:
-h	Help for kubectl	Example: kubectl get pods -h
–dry-run=client	Used to preview the changes without applying

Imperative Approach Commands

kubectl run my-first-pod –image stacksimplify/kubenginx:1.0.0	To create a pod
kubectl expose pod my-first-pod –type=LoadBalancer –port=80 –name=my-first-service	To create a service
kubectl create deployment my-deployment –image=nginx	To create a deployment

Declarative Approach Commands

kubectl apply -f deployment.yaml

To create a deployment

kubectl Filtering

To filter based on labels	k get pods –selector env=dev
	k get all –selector env=prod,bu=finance,tier=frontend