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

Deployments(deploy)

kubectl get deployment	List one or more deployments
kubectl describe deployment <deployment_name>	Display the detailed state of one or more deployments
kubectl edit deployment <deployment_name>	Edit and update the definition of one or more deployment on the server
kubectl create deployment <deployment_name>	Create one a new deployment
kubectl delete deployment <deployment_name>	Delete deployments
kubectl rollout status deployment <deployment_name>	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=<node_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 <pod_name>	Print the logs for a pod
kubectl logs --since=1h <pod_name>	Print the logs for the last hour for a pod
kubectl logs --tail=20 <pod_name>	Get the most recent 20 lines of logs
kubectl logs -f <service_name> [-c <$container>]	Get logs from a service and optionally select which container
kubectl logs -f <pod_name>	Print the logs for a pod and follow new logs
kubectl logs -c <container_name> <pod_name>	Print the logs for a container in a pod
kubectl logs <pod_name> pod.log	Output the logs for a pod into a file named ‘pod.log’
kubectl logs --previous <pod_name>	View the logs for a previously failed pod

kubetail

kubetail <pod_prefix>	Get logs for all pods named with pod_prefix
kubetail <pod_prefix> -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 <namespace_name>	Create namespace
kubectl get namespace <namespace_name>	List one or more namespaces
kubectl delete namespace <namespace_name>	Delete a namespace
kubectl describe namespace <namespace_name>	Display the detailed state of one or more namespace
kubectl edit namespace <namespace_name>	Edit and update the definition of a namespace
kubectl top namespace <namespace_name>	Display Resource (CPU/Memory/Storage) usage for a namespace

Nodes(no)

kubectl taint node <node_name>	Update the taints on one or more nodes
kubectl get node	List one or more nodes
kubectl delete node <node_name>	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 <node_name>	Pods running on a node
kubectl annotate node <node_name>	Annotate a node
kubectl cordon node <node_name>	Mark a node as unschedulable
kubectl uncordon node <node_name>	Mark node as schedulable
kubectl drain node <node_name>	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 <pod_name>	Delete a pod
kubectl describe pod <pod_name>	Display the detailed state of a pods
kubectl create pod <pod_name>	Create a pod
kubectl exec <pod_name> -c <container_name> <command>	Execute a command against a container in a pod
kubectl exec -it <pod_name> /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 <pod_name> <annotation>	Add or update the annotations of a pod
kubectl label pod <pod_name>	Add or update the label of a pod

Replication Controllers(rc)

kubectl get rc	List the replication controllers
kubectl get rc --namespace=”<namespace_name>”	List the replication controllers by namespace

ReplicaSets(rs)

kubectl get replicasets	List ReplicaSets
kubectl describe replicasets <replicaset_name>	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 <secret_name>	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 <service_account_name>	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.

Parameter	Description	Example
-o	Output format. Options include wide, json, yaml, etc.	kubectl get pods -o wide
-n	Shorthand for --namespace. Specifies the namespace for the command.	kubectl get pods -n [namespace_name]
-f	Filename, directory, or URL to files to create, delete, or update resources.	kubectl apply -f ./newpod.yaml
-l	Selector to filter resources based on labels. Supports =, ==, and !=.	kubectl get pods -l app=nginx
-h	Help for the command. Displays usage instructions and options.	kubectl get pods -h
--dry-run=client	Preview the changes without applying them.	kubectl apply -f ./deployment.yaml --dry-run=client
--all	Operate on all resources of a specific type in all namespaces.	kubectl delete pods --all
--context	Specify the Kubernetes context to use for the command.	kubectl get pods --context=my-cluster-context
--watch	Watch for changes to a resource and stream updates to the terminal.	kubectl get pods --watch
--field-selector	Filter resources based on specific fields.	kubectl get pods --field-selector=status.phase=Running
--sort-by	Sort resources by a specific field.	kubectl get pods --sort-by=.metadata.name
--force	Force the action, such as deleting a resource without graceful termination.	kubectl delete pod mypod --force
--kubeconfig	Specify a custom kubeconfig file to use for the command.	kubectl get pods --kubeconfig=/path/to/kubeconfig
--output=jsonpath	Customize the output by specifying a JSONPath expression.	kubectl get pods -o jsonpath='{.items[*].metadata.name}'
--timeout	Time to wait for a command to complete.	kubectl wait --for=condition=ready pod mypod --timeout=30s
--all-namespaces	Operate on all namespaces for the command.	kubectl get pods --all-namespaces
--as	Impersonate a specific user for the command.	kubectl get pods --as=admin
--token	Specify a Bearer Token for authentication.	kubectl get pods --token=abcdef123456
--limit	Limit the number of resources returned.	kubectl get pods --limit=5

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

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