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Friday, March 27, 2015

Weekly Kubernetes Community Hangout Notes - March 27 2015

Every week the Kubernetes contributing community meet virtually over Google Hangouts. We want anyone who's interested to know what's discussed in this forum.

Agenda:
- Andy - demo remote execution and port forwarding
- Quinton - Cluster federation - Postponed
- Clayton - UI code sharing and collaboration around Kubernetes

Notes from meeting:
1. Andy from RedHat:
  • Demo remote execution
    • kubectl exec -p $POD -- $CMD
    • Makes a connection to the master as proxy, figures out which node the pod is on, proxies connection to kubelet, which does the interesting bit.  via nsenter.
    • Multiplexed streaming over HTTP using SPDY
    • Also interactive mode:
      • kubectl exec -p $POD -it -- bash -il
    • Assumes first container.  Can use -c $CONTAINER to pick a particular one.
    • If have gdb pre-installed in container, then can interactively attach it to running process
      • backtrace, symbol tbles, print, etc.  Most things you can do with gdb.
    • Can also with careful flag crafting run rsync over this or set up sshd inside container.
    • Some feedback via chat:
      • UI feedback: things like kubectl log do not take a -p/-c they just expect it to be there.....
        • right
        • i think we would remove -p eventually
        • we were just trying to be cautious because we knew we needed to support CLI args afterwards
        • and everyone gets that wrong the first time
      • -- is hard
        • cobra had bugs with it
        • but that's what we support
        • also we want to bypass shell args in some cases
  • Andy also demoed port forwarding
    • kubectl port-forward -p $POD $LOCALPORT:$REMOTEPORT &
    • localhost% http :$LOCALPORT
  • nsenter vs. docker exec
    • want to inject a binary under control of the host, similar to pre-start hooks
    • socat, nsenter, whatever the pre-start hook needs
  • would be nice to blog post on this
    • how to use it.  or even a screencast?
    • we have a youtube channel and a blog for kubernetes.io
  • version of nginx in wheezy is too old to support needed master-proxy functionality
    • but wheezy-backports seems to have an ok version, so we should pull that in.
2. Clayton: where are we wrt a community organization for e.g. kubernetes UI components?
  • google-containers-ui IRC channel, mailing list.
  • Tim: google-containers prefix is historical, should just do “kubernetes-ui”
  • also want to put design resources in, and bower expects its own repo.
  • General agreement
3. Brian Grant:
  • Testing v1beta3, getting that ready to go in.
  • Paul working on changes to commandline stuff.
  • Early to mid next week, try to enable v1beta3 by default?
  • For any other changes, file issue and CC thockin.
4. General consensus that 30 minutes is better than 60

  • Shouldn’t artificially try to extend just to fill time.

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