Helm supports extra env, volumes and volume mounts for externaldns

[abaguas]

Externaldns requires internet access to configure DNS records. In order to run it behind a proxy one needs to configure the proxy address using environment variables and to mount a volume containing the proxy CA certificate.
This can now be configured using the externaldns.extraEnv, externaldns.extraVolumes and externaldns.extraVolumeMounts variables. Here is an example:

externaldns:
  extraEnv:
  - name: HTTPS_PROXY
    value: http://proxy.example.com:8080
  extraVolumes:
  - name: ca-bundle
    secret:
      secretName: ca-proxy
  extraVolumeMounts:
  - name: ca-bundle
    mountPath: /etc/ssl/certs
    readOnly: true

[ytsarev]

@abaguas that is great, thank you so much for this contribution!

I find your example for PR description extremely useful:

externaldns:
  extraEnv:
  - name: HTTPS_PROXY
    value: http://proxy.example.com:8080
  extraVolumes:
  - name: ca-bundle
    secret:
      secretName: ca-proxy
  extraVolumeMounts:
  - name: ca-bundle
    mountPath: /etc/ssl/certs
    readOnly: true

Can you please add this example to documentation?

It can be a simple proxy.md file to add too docs just mentioning this example with title Running k8gb behind a proxy or similar.

Thanks!

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[abaguas]

@abaguas that is great, thank you so much for this contribution!

I find your example for PR description extremely useful:

externaldns:
  extraEnv:
  - name: HTTPS_PROXY
    value: http://proxy.example.com:8080
  extraVolumes:
  - name: ca-bundle
    secret:
      secretName: ca-proxy
  extraVolumeMounts:
  - name: ca-bundle
    mountPath: /etc/ssl/certs
    readOnly: true

Can you please add this example to documentation?

It can be a simple proxy.md file to add too docs just mentioning this example with title Running k8gb behind a proxy or similar.

Thanks!

Thank you @ytsarev. Done!

[ytsarev]

Amazing! Thanks a lot for the contribution!