untuk memudahkan deploy ke kubernetes maka di sini memakai Helm (package manager untuk kubernetes) dan di sini juga memakai Minikube untuk menjalankan cluster.

How to Install Helm

$ wget https://get.helm.sh/helm-v3.12.0-linux-amd64.tar.gz
$ tar -zxvf helm-v3.12.0-linux-amd64.tar.gz
$ sudo mv linux-amd64/helm /usr/local/bin/helm
$ helm
The Kubernetes package manager

Common actions for Helm:

- helm search:    search for charts
- helm pull:      download a chart to your local directory to view
- helm install:   upload the chart to Kubernetes
- helm list:      list releases of charts

........

Deploy

create folder helm, next create file values.yml & secrets.yml di dalam folder helm.

helm/values.yml

php:
  repository: "cehamot/rssejahterapp"
  tag: "8"
  fpmEnabled: false
  envVars:
    - name: APP_ENV
      value: production
    - name: APP_DEBUG
      value: false
    - name: DB_PORT
      value: 3306
    - name: DB_HOST
      value: localhost

helm/secrets.yml

mysql:
  rootPassword: "secret123"
  user: dani
  password: "secret123"
  database: db_rssejahtera

php:
  envVars:
    - name: APP_KEY
      value: "base64:V0xAWsrcyAPMY1+kgysAWm2ptVSA11+UAu78o/MqDjI="
    - name: DB_DATABASE
      value: db_rssejahtera
    - name: DB_USERNAME
      value: dani
    - name: DB_PASSWORD
      value: "secret123"

selanjutnya secrets.yml di tambahkan ke .dockerignore & .gitignore

echo '/helm/secrets.yml' >> ./.dockerignore && echo '/helm/secrets.yml' >> ./.gitignore

tambahkan Repo LAMP (Linux, Apache, Mysql, PHP).

$ minikube start
$ helm repo add lamp https://lead4good.github.io/lamp-helm-repository
$ helm install rssejahteraapp -f helm/values.yml -f helm/secrets.yml lamp/lamp
$ minikube service rssejahteraapp-lamp --url

migrate database

$ kubectl exec **nama pods** -- php artisan migrate:fresh --seed --force

untuk upgrade dapat menggunakan command, namun di file helm/values.yml dirubah dahulu tag nya.

$ nano helm/values.yaml
$ helm upgrade rssejahteraapp lamp/lamp -f helm/values.yml -f helm/secrets.yml

Rollback

$ helm history rssejahteraapp

and then

$ helm rollback rssejahteraapp 1

Scale

Scale Up

$ kubectl get deployments
$ kubectl scale --replicas 2 deployments/rssejahteraapp-lamp

delete salah satu pod, agar terlihat akan mereplica kembali pod yang sudah di delete.

Scale down

$ kubectl scale --replicas 1 deployments/rssejahteraapp-lamp

Autoscaling

untuk autoscaling create hpa.yml

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: rssejahteraapp-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: rssejahteraapp-lamp
  minReplicas: 1
  maxReplicas: 4
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 60

$ kubectl apply -f helm/hpa.yml

terlihat pods autoscalling.

$ helm delete rssejahteraapp

$ minikube stop