Nodes
kubectl get no
# retrieve a list of all nodes in the current cluster
kubectl get no -o wide
# retrieve a list of all nodes in the current cluster with additional
details such as the node's IP address and role
kubectl describe no
# retrieve detailed node information
kubectl get no -o yaml
# retrieve a list of all nodes in the current cluster in YAML
format
kubectl get node --selector=label-name
# retrieve a list of all nodes with the specified label
kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="ExternalIP")].address}'
# retrieve a list of all node external IP addresses
kubectl top node <node-name>
# display resource usage statistics for a specific node
Pods
kubectl get po
# get a list of pods
kubectl get po -o wide
# get a wide view of pods, including Node and IP
kubectl describe po
# describe all the pods in the current namespace
kubectl get po --show-labels
# get list of pods with labels
kubectl get po -l app=<app-name>
# get list of pods with label "app" equal to <app-name>
kubectl get po -o yaml
# get yaml definition of all the pods in the current namespace
kubectl get pod <pod-name> -o yaml --export > myoffline.yaml
# save yaml definition of the specific pod in the file
kubectl get pods --field-selector=status.phase=Running
# get list of pods with the status "Running"
Adding Resources
Creating A Pod
kubectl create -f <name.of.file>
# create resources from a file
kubectl apply -f <name.of.file>
# apply changes from a file
kubectl run <pod-name> --image=nginx --restart=Never
# run a single instance of an nginx container using "run-pod/v1"
generator
Creating A Service
kubectl create svc nodeport <svc-name> --tcp=8080
# create a NodePort service that exposes TCP port 8080 on the
nodes and maps it to port 80 in the pods
Creating A Deployment
kubectl create -f <name.of.file>
# create resources from a file
kubectl apply -f <name.of.file>
# apply changes from a file
kubectl create deploy <deploy-name> --image=nginx
# create a deployment with nginx container
Interactive Pod
kubectl run <pod-name> --image=busybox --rm -it --restart=Never -- <sh>
# run a temporary busybox container, open an interactive shell and
delete it when it exits
Output YAML to A File
kubectl create deploy <deploy-name> --image=nginx --dry-run -o yaml > deploy.yaml
# create a deployment with an nginx container in YAML format
without creating the resources
kubectl get po <pod-name> -o yaml --export > pod.yaml
# get a pod and output the configuration to a file in YAML format,
ignoring cluster-specific information
Changing Resource Attributes
Taint
kubectl taint <node-name> <taint-name>
# add taint to a node
Labels
kubectl label <node-name> disktype=ssd
# add label to a node
kubectl label <pod-name> env=prod
# add label to a pod
Cordon/Uncordon
kubectl cordon <node-name>
# mark a node as unschedulable
kubectl uncordon <node-name>
# mark a node as schedulable
Drain
kubectl drain <node-name>
# drain a node in preparation for maintenance
Nodes
kubectl delete node <node-name>
# delete a node from the cluster
kubectl edit node <node-name>
# edit a node's configuration
Namespaces
kubectl delete ns <namespace-name>
# delete a namespace
kubectl edit ns <namespace-name>
# edit a namespace's configuration
Deployments
kubectl delete deploy <deploy-name>
# delete a deployment
kubectl edit deploy <deploy-name>
# edit a deployment's configuration
kubectl get roles --all-namespaces kubectl expose deployment <deploy-name> --port=80 --type=NodePort
# expose deployment as a NodePort service
kubectl scale deploy <deploy-name> --replicas=5
# scale a deployment to 5 replicas
Pods
kubectl delete pod <pod-name>
# delete a pod
kubectl edit pod <pod-name>
# edit a pod's configuration
Viewing Resource Information
Secrets
kubectl get secrets
# display a list of secrets in the current namespace
kubectl get secrets --all-namespaces
# display a list of secrets in all namespaces
kubectl get secrets -o yaml
# display the secrets in the current namespace in YAML
format
ConfigMaps
kubectl get cm
# display a list of config maps in the current namespace
kubectl get cm --all-namespaces
# display a list of config maps in all namespaces
kubectl get cm --all-namespaces -o yaml
# display the config maps in all namespaces in yaml format
Ingress
kubectl get ing
# display a list of ingresses in the current namespace
kubectl get ing --all-namespaces
# display list of all ingresses in all namespaces
PersistentVolume
kubectl get pvc
# display list of persistent volume claims in the current
namespace
kubectl describe pvc
# display detailed information about the persistent volume claims
in the cluster
StorageClass
kubectl get sc
# display list of all storage classes in the cluster
kubectl get sc -o yaml
# display the storage classes in yaml format
API Call
kubectl get --raw /apis/metrics.k8s.io/
# get raw json data for the metrics API
Cluster Info
kubectl config
# view and modify kubeconfig files
kubectl cluster-info
# display information about the kubernetes cluster
kubectl get componentstatuses
# get the status of the various components in the kubernetes
cluster
Viewing Resource Information
Events
kubectl get events
# display list of events in the current namespace
kubectl get events -n kube-system
# display list of events in the kube-system namespace
kubectl get events -w
# watch for new events in the current namespace
Logs
kubectl logs <pod-name>
# display logs of the specified pod
kubectl logs --since=1h <pod-name>
# display the logs of a pod for the past 1 hour
kubectl logs -tail=20 <pod-name>
# display the last 20 lines for the logs for a pod
kubectl logs -f -c <container-name> <pod-name>
# follow the logs for a specific container in the pod
kubectl logs <pod-name> > pod.log
# save the logs for a pod to a file
Service Accounts
kubectl get sa
# display a list of service accounts in the current
namespace
kubectl get sa -o yaml
# display a list of service accounts in yaml format
kubectl get serviceaccount default -o yaml
# save the "default" service account in the yaml format to a
file
kubectl replace serviceaccount default -f sa.yaml
# replace the contents of the "default" service account with the
contents of a yaml file
ReplicaSets
kubectl get rs
# display a list of all replica sets in the current
namespace
kubectl describe rs
# display detailed information about replica sets in the current
namespace
kubectl get rs -o wide
# display a list of replica sets in the current namespace with
additional details
kubectl get rs -o yaml
# display the replica sets in the current namespace in yaml
format
Multiple Resources
kubectl get svc,po
# display list of services and pods in the current
namespace
kubectl get deploy,no
# display list of deployments and nodes in the current
namespace
kubectl get all
# display list of all resources in the current namespace
kubectl get all --all-namespaces
# display list of all resources in all namespaces
Viewing Resource Information
Namespaces
kubectl get ns
# display a list of all namespaces in the current cluster
kubectl get ns -o yaml
# display the namespaces in the cluster in yaml format
kubectl describe ns
# display detailed information about a namespace in the
cluster
Deployments
kubectl get deploy
# display list of all deployments in the current namespace
kubectl describe deploy
# display detailed information about deployments in the current
namespace
kubectl get deploy -o wide
# display list of deployments in the current namespace with
additional details
kubectl get deploy -o yaml
# display the deployments in the current namespace in yaml
format
Services
kubectl get svc
# display a list of all services in the current namespace
kubectl describe svc
# display detailed information about services in the current
namespace
kubectl get svc -o wide
# display a detailed list of services about the current namespace
with additional details
kubectl get svc -o yaml
# display the services in the current namespace in yaml
format
kubectl get svc --show-labels
# display a list of services in the current namespace including
their labels
Real-Time Monitoring
kubectl top pod <pod-name>
# display real-time CPU and memory usage for a specific pod
kubectl top node <node-name>
# display real-time CPU and memory usage for a specific
node
Roles
kubectl get roles --all-namespaces
# display a list of all roles in all namespaces
kubectl get roles --all-namespaces -o yaml
# display the roles in all namespaces in YAML format
