Ralph on Kubernetes

ralph-kubernetes.yaml

#
# Note: this does not work right out of the box yet
# - required: manual run of `/var/local/ralph/docker-entrypoint.sh init` (maybe use initContainer)
# - required: manual run of `ralphctl collectstatic` to deploy static files to shared volume for nginx (maybe use lifecycle postStart)
#
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: ralph
  labels:
    app: ralph
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: ralph
    spec:
      containers:
      - name: ralph
        image: allegro/ralph:latest
        ports:
        - containerPort: 8000
        resources:
          requests:
            memory: "500Mi"
            cpu: "250m"
          limits:
            memory: "1Gi"
            cpu: "500m"
        env:
        - name: DATABASE_NAME
          value: 'ralph_ng'
        - name: DATABASE_USER
          value: 'ralph_ng'
        - name: DATABASE_PASSWORD
          value: 'ralph_ng'
        - name: DATABASE_HOST
          value: 'proxysql.default.svc.cluster.local'
        - name: DATABASE_PORT
          value: '3306'
        - name: REDIS_HOST
          value: '127.0.0.1'
        - name: REDIS_PORT
          value: '6379'
        - name: REDIS_DB
          value: '0'
        volumeMounts:
        - name: ralph-static-files
          mountPath: /usr/share/ralph/static
        - name: ralph-media-files
          mountPath: /var/local/ralph/media
      - name: ralph-nginx
        image: nginx
        ports:
        - containerPort: 80
        resources:
          requests:
            memory: "128Mi"
            cpu: "125m"
          limits:
            memory: "256Mi"
            cpu: "250m"
        volumeMounts:
        - name: ralph-nginx-config
          mountPath: /etc/nginx/conf.d/default.conf
          subPath: default.conf
        - name: ralph-static-files
          mountPath: /opt/static
        - name: ralph-media-files
          mountPath: /opt/media
      - name: ralph-redis
        image: redis:3.0
        resources:
          requests:
            memory: "128Mi"
            cpu: "125m"
          limits:
            memory: "256Mi"
            cpu: "250m"
      - name: ralph-inkpy
        image: allegro/inkpy:latest
        resources:
          requests:
            memory: "128Mi"
            cpu: "125m"
          limits:
            memory: "256Mi"
            cpu: "250m"
        env:
        - name: REDIS_HOST
          value: '127.0.0.1'
        - name: REDIS_PORT
          value: '6379'
        - name: REDIS_DB
          value: '0'
      restartPolicy: Always
      volumes:
      - name: ralph-nginx-config
        configMap:
          name: ralph-nginx-conf
      - name: ralph-static-files
        persistentVolumeClaim:
          claimName: ralph-static-files
      - name: ralph-media-files
        persistentVolumeClaim:
          claimName: ralph-media-files
---
apiVersion: v1
kind: Service
metadata:
  name: ralph
  labels:
    app: ralph
spec:
  ports:
  - name: ralph
    port: 8000
    targetPort: 8000
  selector:
    app: ralph
---
apiVersion: v1
kind: Service
metadata:
  name: ralph-nginx
  labels:
    app: ralph-nginx
spec:
  ports:
  - name: ralph-nginx
    port: 80
    targetPort: 80
  selector:
    app: ralph
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ralph-static-files
  labels:
    pvcname: ralph-static-files
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ralph-media-files
  labels:
    pvcname: ralph-media-files
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
---
apiVersion: v1
kind: ConfigMap
metadata: 
  name: ralph-nginx-conf
data:
  default.conf: |
    server {
        listen 80;
        server_name _;

        location /static {
            alias /opt/static;
            expires 1y;
            access_log off;
            add_header Pragma public;
            add_header Cache-Control "public";
        }

        location /media {
            alias /opt/media;
            add_header Content-disposition "attachment";
            access_log off;
        }

        location / {
            proxy_pass http://ralph:8000;

            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }
    }
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ralph
spec:
  rules:
  - host: CHANGEME
    http:
      paths:
      - path: /
        backend:
          serviceName: ralph-nginx
          servicePort: 80