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 yml 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