Play kubernetes with minikube

This document describes how to use minikube on a Mac.

Full Documentation

• Yaml: https://www.mirantis.com/blog/introduction-to-yaml-creating-a-kubernetes-deployment/
  Google documentation is available at: http://kubernetes.io/docs/getting-started-guides/minikube/

• API spec: https://kubernetes.io/docs/api-reference/v1.6/.

• Practice: https://imhotepio.github.io/learnk8s, based on minikube and k8s 1.5.

Prerequisites:

Docker v17.04.0 Kubernetes CLI v1.6.1

MiniKube v0.16.0 Postgresql v9.6.2 : you may need it to follow the examples.

Install Docker:

brew install docker      

verify:

docker version   
docker info    

Install Kubectl:

brew install kubectl

verify:

 kubectl version

Tips:

cd /usr/local/bin  
ln -s ku kubectl

Install Minikube:

 brew install Caskroom/cask/minikube

Start Minikube:

brew install docker-machine-driver-xhyve
sudo chown root:wheel $(brew --prefix)/opt/docker-machine-driver-xhyve/bin/docker-machine-driver-xhyve
sudo chmod u+s $(brew --prefix)/opt/docker-machine-driver-xhyve/bin/docker-machine-driver-xhyve

Start:

minikube start --cpus 2 --memory 2048 --vm-driver xhyve

Find IP address of Minikube

minikube ip
192.168.218.152

Check the services of Minikube:

minikube service list

Access UI in browser

minikube dashboard
Opening kubernetes dashboard in default browser...

SSH to Minikube

minikube ssh

See Kubernetes logs

minikube logs -f $POD_ID

Stop Minikube

minikube stop
Stopping local Kubernetes cluster...
Machine stopped.

Tips before following the examples:

• get/watch information:

    kubectl get po,svc,deploy 
    kubectl get po,svc,deploy  -o wide
    kubectl get po --watch
  

• secrets environment value should be encoded with Base64.

• must enable heapster if you want to use auto scaling. And it will take serveral minutes to work.

    minikube addons enable heapster
  

• check status of the pod:

    kubectl get po
  

• check the log:

    kubectl logs -f POD_ID
  

• If deploy was used, you can not delete pod

    kubectl delete po $POD_ID"
  

  you should use:

    kubectl delete deploy $DEPLOY_ID
  

How to use the yaml file:

kubectl create -f $NAME.yml
kubectl delete -f $NAME.yml

Example1: services and pod

lab_pod.yml lab_service.yml lab_service_and_pod.yml

Example2: secrets

deploy sequence: secret, db lab_secrets_secret.yml
lab_secrets_db.yml

Example3: auto scaling.

kubectl get hpa   

lab_auto_scale.yml

Example4: Probe

lab_probe.yml

Example5: persistant volume.

lab_pvc.yml

Example6: UI–API–DB, a small project

deploy sequence: db, api, ui lab_monitor_db.yml
lab_monitor_api.yml
lab_monitor_ui.yml