Basics for kubectl

kubectl_basics.sh

# Documentation: https://kubernetes.io/docs
#
# get kubernetes version and info
kubectl version

# get infor on pods
kubectl get pods
# get info on deployments
kubectl get deployments
kubectl describe deployments
# get info on replicas
kubectl get rs

# get POD name (if only one pod is there)
export POD_NAME=$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
# show environment variables
kubectl exec $POD_NAME env

# deployments
# the same command is used for "UPDATES!"
# simply change the parameters, version-numbers, etc and run the command again
kubectl apply -f <deployment.yml>

# whatch the pods for a specific app:
kubectl get pods -l app=<your_app>
# deployment Details
kubectl describe deployment <your_deployemnt>
# see service details
kubectl get svc <my-nginx>
kubectl describe svc <my-nginx>

# make available:
kubectl expose <deployment/my-nginx>

# delete deployment
kubectl delete deployment <deployment>

# open bash in the container
kubectl exec -it <pod> -- /bin/bash

# Port-Forwarding:
# port-forward <kind/name> <local-port>:<remove-port>
kubectl port-forward redis-master-765d459796-258hz 6379:6379
kubectl port-forward deployment/redis-master 6379:6379

# let kubernetes choose a random local port
kubectl port-forward deployment/redis-master :6379