kubernetes basics with minikube

kubernetes-basics

# Installation (Mac)

brew update; brew install minikube

minikube version
minikube start

# kubectl

kubectl version
kubectl cluster-info
kubectl get nodes

## Installing the web UI

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml
kubectl proxy
open http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/

minikube dashboard


## Create deployment from docker image (related 'docker build')

kubectl create deployment kubernetes-bootcamp --image=gcr.io/google-samples/kubernetes-bootcamp:v1
kubectl get deployments

## Expose cluster using the proxy (CTRL-C aborts proxy)

kubectl proxy
minicube ip

## Now you can access the private cluster network on localhost:8001

kubectl get pods
kubectl describe pods

## get logs from a comntainer in a pod 
kubectl logs 

## Get resources from a pod
kubectl get 

## Run command in a container in a pod
kubectl exec

## Start interactive shell
kubectl exec -ti $PODNAME bash

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

## Get pods by matching/selecting by label 

kubectl get pods -l run=kubernetes-bootcamp

## Set label on pod

kubectl label pod $POD_NAME app=v1

## Delete service by label

kubectl delete service -l run=kubernetes-bootcamp

# Scaling
# Scaling is the same as increasing the number of replicas in a deployment.

## get the replica set

kubectl get rs

## Scale to 4 replicas

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

# Rolling updates

## Upgrade deployment (set new image)

kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2

## Check status

kubectl rollout status deployments/kubernetes-bootcamp

## Roll back deployment

kubectl rollout undo deployments/kubernetes-bootcamp

# Related

## Building Docker images 
https://docs.docker.com/engine/reference/commandline/build/


# Read more (local docker deamon and deplyoments in minikube locally)

https://gist.github.com/kevin-smets/b91a34cea662d0c523968472a81788f7