MeetingMinutes: 2015 07 22

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Discussion Notes

https://plus.google.com/u/0/events/cqbpkdlj4gnalm2mfn1e7gog408

Topics to discuss:

• hooks (mrunalp)
• join cgroups by pid (mrunalp)
• subcontianers (vmarmol)
• os/arch (mrunalp)
• container updates(vmarmol)
• app classes (vmarmol)
• cgroup subgroups (philips)

Attendees:

• Alexander Morozov
• Brandon Philips
• Daniel Dao
• Mrunal Patel
• Tianon Gravi
• Victor Marmol
• Vishnu Kannan
• Vincent Batts

Minutes:

• hooks
  • https://github.com/opencontainers/specs/pull/34
  • root path is of the container
• https://github.com/opencontainers/specs/issues/41
  • config.json where state is stored conflates mutable, immutable and host specific information
• SubContainers
  • https://github.com/opencontainers/specs/issues/66
  • follow-up on kernel cgroup namespaces
    • https://lkml.org/lkml/2014/10/13/456
    • no activity since 10/2014
  • TODO(philips) following up with nested cgroups
  • CRIU issues with subcgroups - vish
• Subcontainers
  • same as subcgroups
• container updates
  • https://github.com/opencontainers/specs/issues/17
  • vmarmol -
  • we should support them
  • What should be included? rootfs, maybe, but resources (e.g. cgroups, rlimits, sysctl)
  • Possibly a bind mount after container is running (e.g. for batch jobs)
• OS/Arch
  • https://github.com/opencontainers/specs/issues/39
  • philips -
  • x86 and arm are understood
  • wait until there an overwhelming number of requests, then at a byteorder field
  • but don’t worry about it now
• join cgroups by pid - mrunalp
  • https://github.com/opencontainers/specs/issues/68
  • mrunalp to make an issue for state hierarchy
• consistent hashing - philips
  • serializing state for hashing and transport (e.g. with protobuf)
  • this is dependent on config.json having conflated with host and config
  • philips to make an issue for separating this json apart
    • where host.json is not hashed, but config.json would be
  • difference of container asks (hashed) and runtime actualization (not-hashed)
• regularity of meetings - mrunalp
  • weekly or bi-weekly?
  • we’ll do weekly for now

Topics to discuss next time:

• app classes - vmarmol