Kubernetes SIG/Meetings/2023-06-27

Attendees: Brian King Ben Tullis Alexandros Kosiaris Stef Dunlap Andrew Otto Ryan Kemper

Agenda:

• Introductions for new members (if any)
• SIG administrivia:
  • Alex won’t be running these meetings in September-November.
  • Alex still has a TODO to make a draft policy the helm decision. Page will be https://wikitech.wikimedia.org/wiki/Kubernetes/Upstream_Helm_charts_policy

• Misc:
  • [Stef] Magic trick: KEDA HTTP autoscaler
    • Immediate use case: Running out of resources in staging, silly because the deployments are barely used.  Would like to scale down to nothing when not in use.
    • KEDA is an k8s autoscaler
    • KEDA-HTTP autoscaler  not for production, experimental
    • If no resources allocated, KEDA-HTTP will pause incoming HTTP request as it spawns resources
    • AW Gitlab Bot from gerrit patch.  
      • Creates link to Environment: aw-930161.wmcloud.org, which will spin up MW using that patch.
      • https://gitlab.wikimedia.org/repos/abstract-wiki/aw-ci-chart/-/blob/main/templates/wikifunctions.yaml
    • AO: can we use this pattern to deploy other things from CI?
      • Stef: yes, but if you don’t need scale down to 0, you might just be able to make CI do an actual temporary deployment.
    • AK: how does it work?
      • https://github.com/kedacore/http-add-on/blob/main/docs/design.md#architecture-overview
    • BK: do we have any auto scaling at WMF now?
      • AK: not really, we do have one use case: video scaling. When lots of work, we just throttle.
  • BK: alternate container runtimes?
    • AK: looked a bit, looking at containerd as a side project.  Feels very close to docker, mostly.  It has namespaces?  Might be making an OKR for the next quarter.  Want to use gadvisor(?) for wikifunctions.
  • AK: I am going on sabbatical starting sept. 8.  Janis will be replacing me as meeting leader.
• Topic: <no specific topic was discussed>