Kubernetes: how to avoid duplicating env in multiple deployments?

kubernetes, kubernetes-helm

Solution

So I found a solution with Helm named templates: https://github.com/kubernetes/helm/blob/master/docs/chart_template_guide/named_templates.md

I created a file `templates/_env.yaml` with the following content:

{{ define "env" }}
            - name: NODE_ENV
              value: "{{ .Values.node_env }}"
            - name: BASEURL
              value: "{{ .Values.base_url }}"
            - name: REDIS_HOST
              valueFrom:
                secretKeyRef:
                  name: secret-redis
                  key: host
            - name: KUE_PREFIX
              value: "{{ .Values.kue_prefix }}"
            - name: DATABASE_NAME
              value: "{{ .Values.database_name }}"
            - name: DATABASE_HOST
              valueFrom:
                secretKeyRef:
                  name: secret-postgres
                  key: host
            - name: DATABASE_USER
              valueFrom:
                secretKeyRef:
                  name: secret-postgres
                  key: username
            - name: DATABASE_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: secret-postgres
                  key: password
            - name: AWS_KEY
              valueFrom:
                secretKeyRef:
                  name: secret-bucket
                  key: key
            - name: AWS_SECRET
              valueFrom:
                secretKeyRef:
                  name: secret-bucket
                  key: secret
            - name: AWS_S3_BUCKET
              valueFrom:
                secretKeyRef:
                  name: secret-bucket
                  key: bucket
            - name: AWS_S3_ENDPOINT
              value: "{{ .Values.s3_endpoint }}"
            - name: INSTAGRAM_CLIENT_ID
              valueFrom:
                secretKeyRef:
                  name: secret-instagram
                  key: clientID
{{ end }}

And here's how I use it in a `templates/deployment.yaml` files:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: somedeployment
  # ...
spec:
  template:
    # ...
    metadata:
      name: somedeployment
    spec:
      # ...
      containers:
        - name: container-name
          image: someimage
          # ...
          env:
            {{- template "env" . }}

Problem

Original source