Grafana returns 401 on direct image render link from the image renderer

What happened: Following the instruction on https://grafana.com/docs/grafana/latest/administration/image_rendering/#remote-rendering-service . Image Renderer throws error on unauthorized access to grafana.

What you expected to happen: Image Renderer should be able to call grafana for direct rendered image

How to reproduce it (as minimally and precisely as possible): Following the instruction on https://grafana.com/docs/grafana/latest/administration/image_rendering/#remote-rendering-service

Anything else we need to know?:

Environment:

• Grafana Image Renderer version: latest
• Grafana version: 6.5.3
• Installed plugin or remote renderer service: As a service on a container
• OS Grafana Image Renderer is installed on: container
• User OS & Browser: Mac OS / Chrome
• Others:

1/21/2020 4:48:04 PM{"level":"info","message":"Render request received', 'url', http://grafana:3000/d-solo/N4gOslEWk/grafana-alert-troubleshooting?orgId=1&panelId=2&render=1"}

1/21/2020 4:48:04 PM{"0":"msg","1":"Failed to load resource: the server responded with a status of 401 (Unauthorized)","2":"url","3":"http://grafana:3000/d-solo/N4gOslEWk/grafana-alert-troubleshooting?orgId=1&panelId=2&render=1","4":"line","6":"column","level":"error","message":"Browser console error"}

[erkiesken]

We also ran into this, there’s a Grafana deployment with 2 pods in k8s for us, and Grafana renderer as separate deployment. And GF_RENDERING_CALLBACK_URL is using a k8s Service, so might hit one of the 2 Grafana pods, sometimes failing sometimes succeeding. Would be nice to have support for this setup too.

[marefr]

Closed by https://github.com/grafana/grafana/pull/22031 and will be included in Grafana v6.7.0. You’ll need to configure rendering callback url in Grafana to be able for renderer to callback into public/load balancer url.