Notes made during initial trial of Kubernetes minkube

php-hello-world-kubernetes-notes.md

Notes on first trial of Kubernetes

Using minikube makes it easy to install a single server Kubernetes cluster for local testing/development.

Resources

• php-hello-world.yml
• php-hello-world.svc.yml

References

• https://github.com/kubernetes/minikube
• https://kubernetes.io/docs/user-guide/prereqs/
• https://kubernetes.io/docs/tutorials/
• https://kubernetes.io/docs/user-guide/deployments/
• https://kubernetes.io/docs/user-guide/services/
• https://kubernetes.io/docs/user-guide/docker-cli-to-kubectl/

Install kubectl - OSX

Ref: https://kubernetes.io/docs/user-guide/prereqs/

Switch to bash if necessary.

$ bash

Download and install the latest stable release.

$ curl -#LO https://storage.googleapis.com/kubernetes-release/release/$(
    curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt
  )/bin/darwin/amd64/kubectl \
  && install kubectl /usr/local/bin/kubectl

Install minikube - OSX

$ curl -#Lo minikube \
  https://storage.googleapis.com/minikube/releases/v0.17.1/minikube-darwin-amd64 \
  && install minikube /usr/local/bin/minikube

Configure to use VirtualBox by default.

$ minikube config set vm-driver virtualbox

Install xhyve driver (an optional alternative to VirtualBox)

This step is optional. Skip this if intending to use the virtualbox vm driver.

$ brew install docker-machine-driver-xhyve

Start up minkube

Note: This will take some time

$ minikube start

OR, if using xhyve.

$ minikube start --vm-driver=xhyve

Discover minikube IP address

$ minikube ip

OR

$ kubectl cluster-info

Access the Kubernetes Dashboard

$ minikube dashboard

Setup a Deployment

Note: Will take some time pulling images.

$ kubectl create -f php-hello-world.yml --record

How to Delete a Deployment

$ kubectl delete -f php-hello-world.yml

Setup a Service

$ kubectl create -f php-hello-world.svc.yml

Show info on the deployment

$ kubectl get deployment php-hello-world

Scale up from 1 to 3 pods

$ kubectl scale --current-replicas=1 --replicas=3 deployment/php-hello-world

List pods

$ kubectl get pods --show-labels

Check deployment rollout status

$ kubectl rollout status deployment/php-hello-world

Discover Service URL endpoint(s)

$ minikube service php-hello-world --url

Given a pod name, run an interactive bash session

$ kubectl exec -it {pod-name} bash

Updating a deployment

Ref: https://kubernetes.io/docs/user-guide/deployments/#updating-a-deployment

To update the image named php-hello-world to use the tag jdeathe/centos-ssh-apache-php:2.1.1.

$ kubectl set image deployment/php-hello-world php-hello-world=jdeathe/centos-ssh-apache-php:2.1.1

Alternatively, edit the deployment to be applied on save.

$ kubectl edit deployment/php-hello-world