Adding arrays as Kubernetes environment variables

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You can inject your entire application.conf with a mechanism of ConfigMaps:

apiVersion: v1
kind: ConfigMap
metatada:
  name: app-config
data:
  application.conf: |
    play.cache.redis {
      # enable cluster mode
      source: cluster
      # nodes are defined as a sequence of objects:
      cluster:  [
        {
          # required string, defining a host the node is running on
          host:        localhost
          # required integer, defining a port the node is running on
          port:        6379
          # optional string, defines a password to use
          password:    null
        }
      ]
    }

and then mount it directly to your container:

apiVersion: v1
kind: Pod
metadata:
  name: ....
spec:
  containers:
    - name: ...
      image: ...
      volumeMounts:
      - name: config-volume
        mountPath: /etc/config
  volumes:
    - name: config-volume
      configMap:
        name: app-config

The app can access it then at /etc/config/application.conf.

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Jonathan Perry
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Jonathan Perry

Currently working as a Software Engineer working mainly in Javascript / Mobile aspects (JS at work, mobile for fun, occasionally)

Updated on September 14, 2022

Comments

  • Jonathan Perry
    Jonathan Perry over 1 year

    I'm working on a Java Play project, and in my application.conf file I have a Redis cluster set-up that receives an array of Redis server nodes.

    Now, I want to inject that value in Kubernetes deployment as an environment variable and can't find the right syntax to do so.

    My current application.conf looks something like this:

    play.cache.redis {
      # enable cluster mode
      source: cluster
    
      # nodes are defined as a sequence of objects:
      cluster:  [
        {
          # required string, defining a host the node is running on
          host:        localhost
          # required integer, defining a port the node is running on
          port:        6379
          # optional string, defines a password to use
          password:    null
        }
      ]
    }
    

    Can someone please tell me how to pass the play.cache.redis.cluster variable to a Kubernetes deployment so it stays like this?