Controller auto-update

Question

Controller auto-update

olix0r opened this issue 6 years ago · comments

In order to closely track a release train (especially edge), it would be nice to have an auto-update operator that is responsible for watching the version-check api and replacing linkerd controller pods (possibly after some user ack).

Furthermore, this may motivate changing the inject flow to make the controller process the YAML. With auto-inject, and the general desire to have cluster-wide policy, like skip-port whitelists, profile domain policy, etc. This would also reduce the logic related to auto-inject.

It would ideally also update itself in a way that allowed it to ensure the new updater is healthy before closing gracefully (i.e., not bluntly overwriting its own kubernetes resource).

Oliver Gould · Answer 1 · Sat Dec 15 2018 04:58:52 GMT+0800 (China Standard Time)

@brianredbeard We spoke at KubeCon and you mentioned that you had some advice on this issue. Would love any input you might have.

Thomas Rampelberg · Answer 2 · Thu Jan 03 2019 06:18:07 GMT+0800 (China Standard Time)

I'm really interested in this issue for edge builds.

Sumukha Pk · Answer 3 · Sat Mar 02 2019 11:24:11 GMT+0800 (China Standard Time)

Hello people! I saw this under the GSoC projects list and Im interested. Currently building linkerd. Can I know how to reproduce the above issue?

Thomas Rampelberg · Answer 4 · Wed Mar 06 2019 04:23:29 GMT+0800 (China Standard Time)

@SUMUKHA-PK what do you mean by reproducing the issue?

Sumukha Pk · Answer 5 · Wed Mar 06 2019 09:54:48 GMT+0800 (China Standard Time)

I wanted to know about any current implementations/the module where the implementation must be done actually.

Thomas Rampelberg · Answer 6 · Thu Mar 07 2019 02:05:01 GMT+0800 (China Standard Time)

There's nothing that exists so far, it would end up being a completely separate component of the control plane. Probably a Deployment with a single replica that polls version.json, checks the control plane version and then starts to update it. A naive solution would be something that pulls down the new version of the linkerd CLI, applies the YAML from install to the cluster and then does something similar for the pods that have been injected.

Abdullah Mustaqeem · Answer 7 · Sat Mar 30 2019 03:01:21 GMT+0800 (China Standard Time)

This is a very interesting project for me. I want to work on it in GSoC.

Thomas Rampelberg · Answer 8 · Sat Mar 30 2019 03:04:42 GMT+0800 (China Standard Time)

Great! Please drop into linkerd slack, we've got a #gsoc channel there. You'll want to start thinking through implementation details for the application and getting to know us a little better by tackling some issues. To get to know the code a little better, take a look at some of the controller and cli issues in particular.