Cheatsheet

List all objects created in cluster.

kubectl get all

Detele all objects created in cluster.

kubectl delete all --all --all-namespaces

Create a Pod Object using Standard Input

cat <<EOF | kubectl apply -f - apiVersion: v1 kind: Pod metadata: name: redis spec: containers: - name: redis-container image: redis123 EOF

Scale ReplicaSet

Option1) kubectl replace -f replicaset-scale.yaml
Option2) kubectl scale --replicas=6 -f replicaset.yaml
Option3) kubectl scale --replicas=6 replicaset myapp-replicaset

Scaffolding manifest files.

kubectl run --generator=run-pod/v1 nginx --image=nginx --dry-run=client -o yaml
kubectl create deployment --image=nginx nginx --dry-run=client -o yaml

set dev namespace as active context for the current context I am interacting in

kubectl config set-context $(kubectl config current-context) --namespace=dev

Deployments

Imperative Create

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

Services

Imperative Create

kubectl expose pod redis --port=6379 --name redis-service --dry-run=client -o yaml
kubectl create service clusterip redis --tcp=6379:6379 --dry-run=client -o yaml
kubectl expose pod nginx --port=80 --name nginx-service --type=NodePort --dry-run=client -o yaml
kubectl create service nodeport nginx --tcp=80:80 --node-port=30080 --dry-run=client -o yaml

ConfigMaps

Imperative Create

kubectl create configmap \ app-config --from-literal=APP_COLOR=blue \ --from-literal=APP_MOD=prod kubectl create configmap \ app-config --from-file=app_config.properties

Secrets

Imperative Create

kubectl create secret generic \ app-secret --from-literal=DB_HOST=mysql \ --from-literal=DB_USER=root \ --from-literal=DB_PASSWD=passrd

Taints

kubectl taint nodes node1 key=value:NoSchedule kubectl taint nodes ip-192-168-240-76.ec2.internal lifecycle=od:NoSchedule

ClusterRoles

kubectl create clusterrole foo --verb=get,list,watch --resource=rs.extensions --dry-run=client -o yaml > cr.yaml

ClusterRoleBinding

kubectl create clusterrolebinding foo --clusterrole=foo --user=bar --dry-run=client -o yaml > crb.yaml

api-groups

kubectl api-resources

Service Ingress

kubectl expose deployment -n ingress-space ingress-controller --type=NodePort --port=80 --name=ingress --dry-run -o yaml >ingress.yaml