Minikubeで同一ポッド内にPostgreSQLとKanboardを配置する(local永続ボリューム使用)

Kanboardはタスク管理をおこなうPHP製のソフトウェアです。Minikubeで同一ポッド内にPostgreSQLとKanboardを配置するには、以下の手順を実行します。PostgreSQLとKanboardのデータはlocal永続ボリュームに保存します。

実行手順

1. KanboardとPostgreSQLデータ格納用ディレクトリを作成
以下のコマンドでKanboardとPostgreSQLデータ格納用ディレクトリを作成します。

minikube ssh

sudo mkdir -p /var/pgdata
sudo mkdir -p /var/kanboard_data
sudo mkdir -p /var/kanboard_plugins
sudo mkdir -p /var/kanboard_ssl

exit

2. local永続ボリュームの作成
以下のコマンドでlocal永続ボリュームを作成します。
※PostgreSQLデータ用

cat << EOF > local-pg-pv.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-pg-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  local:
    path: /var/pgdata
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - minikube
EOF

kubectl apply -f ./local-pg-pv.yml

※Kanboardデータ用

cat << EOF > local-kanboard-data-pv.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-kanboard-data-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  local:
    path: /var/kanboard_data
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - minikube
EOF

kubectl apply -f ./local-kanboard-data-pv.yml

※Kanboardプラグイン用

cat << EOF > local-kanboard-plugins-pv.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-kanboard-plugins-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  local:
    path: /var/kanboard_data
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - minikube
EOF

kubectl apply -f ./local-kanboard-plugins-pv.yml

※KanboardのSSL用

cat << EOF > local-kanboard-ssl-pv.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-kanboard-ssl-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  local:
    path: /var/kanboard_ssl
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - minikube
EOF

kubectl apply -f ./local-kanboard-ssl-pv.yml

3. 永続ボリューム要求の作成
以下のコマンドで永続ボリューム要求を作成します。
※PostgreSQLデータ用

cat << EOF > local-pg-pvc.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: local-pg-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: local-storage
  resources:
    requests:
      storage: 5Gi
  volumeName: local-pg-pv
EOF

kubectl apply -f ./local-pg-pvc.yml

※Kanboardデータ用

cat << EOF > local-kanboard-data-pvc.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: local-kanboard-data-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: local-storage
  resources:
    requests:
      storage: 5Gi
  volumeName: local-kanboard-data-pv
EOF

kubectl apply -f ./local-kanboard-data-pvc.yml

※Kanboardプラグイン用

cat << EOF > local-kanboard-plugins-pvc.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: local-kanboard-plugins-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: local-storage
  resources:
    requests:
      storage: 5Gi
  volumeName: local-kanboard-plugins-pv
EOF

kubectl apply -f ./local-kanboard-plugins-pvc.yml

※KanboardのSSL用

cat << EOF > local-kanboard-ssl-pvc.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: local-kanboard-ssl-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: local-storage
  resources:
    requests:
      storage: 5Gi
  volumeName: local-kanboard-ssl-pv
EOF

kubectl apply -f ./local-kanboard-ssl-pvc.yml

4. KanboardとPostgreSQLのDeploymentの作成
以下のコマンドでkanboardとpostgresqlを含むポッドと作成したlocal永続ボリュームを使用するDeploymentを作成します。

cat << EOF > kanboard-pg-deployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kanboard-pg-deployment
  labels:
    app: kanboard-pg
spec:
  replicas: 1
  selector:
    matchLabels:
      app: kanboard-pg
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: kanboard-pg
    spec:
      containers:
      - name: mypg
        image: postgres:14-alpine
        env:
        - name: POSTGRES_DB
          value: kanboard
        - name: POSTGRES_USER
          value: kanboard
        - name: POSTGRES_PASSWORD
          value: kanboard
        ports:
        - containerPort: 5432
        volumeMounts:
        - name: pg-data
          mountPath: /var/lib/postgresql/data
      - name: kanboard
        image: kanboard/kanboard:latest
        env:
        - name: DATABASE_URL
          value: postgres://kanboard:kanboard@127.0.0.1:5432/kanboard
        ports:
        - containerPort: 80
          name: http
        - containerPort: 443
          name: https
        volumeMounts:
        - name: kanboard-data
          mountPath: /var/www/app/data
        - name: kanboard-plugins
          mountPath: /var/www/app/plugins
        - name: kanboard-ssl
          mountPath: /etc/nginx/ssl
      volumes:
      - name: pg-data
        persistentVolumeClaim:
          claimName: local-pg-pvc
      - name: kanboard-data
        persistentVolumeClaim:
          claimName: local-kanboard-data-pvc
      - name: kanboard-plugins
        persistentVolumeClaim:
          claimName: local-kanboard-plugins-pvc
      - name: kanboard-ssl
        persistentVolumeClaim:
          claimName: local-kanboard-ssl-pvc
EOF

kubectl apply -f ./kanboard-pg-deployment.yml

5. KanboardとPostgreSQLのサービスの作成
以下のコマンドでサービスを作成します。

cat << EOF > kanboard-pg-service.yml
apiVersion: v1
kind: Service
metadata:
  name: kanboard-pg-service
spec:
  selector:
    app: kanboard-pg
  ports:
  - name: http
    protocol: TCP
    port: 8080
    targetPort: 80
  - name: https
    protocol: TCP
    port: 443
    targetPort: 8443
  - name: db
    protocol: TCP
    port: 3306
    targetPort: 3306
EOF

kubectl apply -f ./kanboard-pg-service.yml

6. Port-Fowardingで外部からアクセスできるようにする

kubectl port-forward --address 0.0.0.0 service/kanboard-pg-service 8080:8080 3306:3306

ブラウザから以下のURLからKanboardにアクセスします。
http://<MinikubeをインストールしたホストのIP>:8080/

初期ログインはユーザadmin、パスワードadminでログインしてください。