Kubernetes Command Cheat Sheet

Quick cheat sheet, which can be used for daily basis work with Kubernetes.

Commands for Pods

• Pod List

kubectl get pods
kubectl get pods -o wide
kubectl get pods -n kube-system // namespace
kubectl get pods --selector app = app1, env = prod // label filtering
kubectl get pods --all-namespaces

• Pod Status

kubectl describe pod pod-name

• Create Pod

kubectl run pod-name --image nginx

• Edit Pod

kubectl edit under sub-name
kubectl get under pod-name -o yaml> pod.yaml

• Create Pod with yml files

kubectl create -f pod-difinition.yml
kubectl apply -f pod-difinition.yml

• Delete Pod

kubectl delete under sub-name

Commands for ReplicaSet

• Get Replicaset

kubectl get replicaset

• Delete Replicaset

kubectl delete replicaset replicaset-name

• Scale

kubectl replace -f replicaset-definition.yml
kubectl scale --replicas=6 -f replicaset-definition.yml
kubectl scale --replicas=6 replicaset myapp-replicaset

• Generate Deployment file

kubectl create deployment --image=nginx nginx --replicas=6 --dry-run -o yaml > deployment.yaml

Commands for Namespaces

• Get Pods from namespace

kubectl get pods --namespace=develop
kubectl get pods --all-namespaces

• Change default namespace

kubelctl config set-context $(kubectl config current-context) --namespace=develop

Scheduling

• Taints / Tolerations -Node

kubectl taint nodes node3 app=red:NoSchedule
// The settings on the YAML side are as follows
spec:
 tolerations:
  - key: "app"
    operator: "Equal"
    value: "blue"
    effect: "NoSchedule"

• Remove Taints

kubectl taint nodes node3 app=red:NoSchedule-

• Node Slector | Label Nodes

kubectl label nodes node-name label-key=label-name
// The settings on the YAML side are as follows
spec:
  nodeSelector:
    label-key: label-name

• Node Affinity

apiVersion: v1
kind: Pod
metadata:
  name: with-pod-affinity
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
          - matchExpressions:
            - key: security
              operator: In
              values:
              - S1
  containers:
  - name: with-pod-affinity
    image: k8s.gcr.io/pause:2.0

• Get Events

kubectl get events | grep schedule

• Get Logs

kubectl get logs | grep schedule