Allow configuration through environment variables

[spawnia]

I am currently setting up Sentry Relay in our Kubernetes cluster. Passing the configuration as a file works fine, but is relatively verbose.

kind: Deployment
spec:
  template:
    spec:
      containers:
        - name: relay
          image: getsentry/relay
          volumeMounts:
            - mountPath: /work/.relay
              name: relay
      volumes:
        - name: relay
          configMap:
            name: relay
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: relay
data:
  config.yml: |
    relay:
      mode: proxy

It would be nice if I could pass the configuration values as environment variables instead.

kind: Deployment
spec:
  template:
    spec:
      containers:
        - name: relay
          image: getsentry/relay
          env:
            - name: RELAY_MODE
              value: proxy

Such a configuration style is common practice among many other Docker images i have used.

[RaduW]

Relay already supports setting common configuration parameters with either command line arguments or environment variables.
Please have a look at:
https://github.com/getsentry/relay/blob/master/relay/src/cli.rs#L53-L91
in order to see how to do that through either command line arguments or environment variables.

[spawnia]

Thank you for the quick answer. How would i specify the mode with that?

[RaduW]

Mode is unfortunately not one of the configurations you can specify through command line or environment variables.
The default mode is managed if you need a different mode you would need to provide a configuration file.