Kubernetes commands from tutorial https://kubernetes.io/docs/tutorials

setup (optional)

sudo minikube start --vm-driver=none
sudo minikube stop
sudo minikube delete -p minikube

sudo mv /root/.kube /root/.minikube $HOME
sudo chown -R $USER $HOME/.kube $HOME/.minikube
vi $HOME/.kube/config

check cluster

minikube version
minikube ip
kubectl version
kubectl cluster-info

run pod

kubectl run kubernetes-bootcamp --image=gcr.io/google-samples/kubernetes-bootcamp:v1 --port=8080
kubectl run hello-minikube --image=k8s.gcr.io/echoserver:1.10 --port=8080

kubectl get pods
kubectl get deployments

export POD_NAME=$(kubectl get pods -o go-template \
--template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
echo POD_NAME=$POD_NAME

access to running pod

kubectl exec -it $POD_NAME env
kubectl exec -it $POD_NAME curl http://localhost:8080
kubectl exec -it $POD_NAME bash

create service (expose pod)

kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 8080
kubectl get services 
kubectl describe services/kubernetes-bootcamp

access outside cluster

export NODE_PORT=$(kubectl get services/kubernetes-bootcamp \
-o go-template='{{(index .spec.ports 0).nodePort}}')
echo NODE_PORT=$NODE_PORT
curl $(minikube ip):$NODE_PORT

get by label

kubectl describe services 
kubectl get deployments -l run=kubernetes-bootcamp
kubectl get pods -l run=kubernetes-bootcamp
kubectl get services -l run=kubernetes-bootcamp

label a pod

kubectl label pod $POD_NAME app=v1
kubectl get pods -l app=v1
kubectl get services -l app=v1 # not labeled

scale-up pods

kubectl scale deployments/kubernetes-bootcamp --replicas=4
kubectl get deployments
kubectl get pods -o wide

see load balancing

curl $(minikube ip):$NODE_PORT # requests are served at different pods
curl $(minikube ip):$NODE_PORT
curl $(minikube ip):$NODE_PORT
curl $(minikube ip):$NODE_PORT

roll upgrade

kubectl set image deployments/kubernetes-bootcamp \
kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2
kubectl get pods # see changes
kubectl get pods
kubectl get pods

kubectl rollout status deployments/kubernetes-bootcamp # confirm rollout with latest image version

roll back

kubectl set image deployments/kubernetes-bootcamp \
kubernetes-bootcamp=gcr.io/google-samples/kubernetes-bootcamp:v10
kubectl get pods # see problem
kubectl rollout undo deployments/kubernetes-bootcamp # roll back to previous image version
kubectl get pods

remove service

kubectl delete service -l run=kubernetes-bootcamp
kubectl get services
curl $(minikube ip):$NODE_PORT
kubectl exec -it $POD_NAME curl localhost:8080