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bgrant0607's profile
Brian Grant
Brian Grant
Brian Grant
@bgrant0607

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Brian Grant

@bgrant0607

Google Cloud. Kubernetes Steering Committee emeritus, K8s SIG Architecture co-Chair emeritus, CNCF TOC member emeritus

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github.com/bgrant0607
Joined June 2014

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    1. Tim Hockin‏ @thockin 27 Apr 2017
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      Interesting failure mode I have seen a few times now: App runs in Docker on laptop, OOMs in #kubernetes. Turns out to be ...

      3 replies 21 retweets 53 likes
    2. Tim Hockin‏ @thockin 27 Apr 2017
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      Replying to @thockin

      ... code that scales usage per-core or per-GB. It detects many cores (more than laptop) via /proc/cpuinfo, and tries to use them, but ...

      4 replies 0 retweets 8 likes
    3. Tim Hockin‏ @thockin 27 Apr 2017
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      Replying to @thockin

      ... the container is limited to less-than-all the cores on the machine, so it blows up. Lesson: ...

      1 reply 0 retweets 5 likes
    4. Tim Hockin‏ @thockin 27 Apr 2017
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      Replying to @thockin

      ... how to probe "available" resources is necessarily different from inside containers. This is under-recognized and under-developed ...

      4 replies 6 retweets 18 likes
    5. Tim Hockin‏ @thockin 27 Apr 2017
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      Replying to @thockin

      ... We need new tools & techniques to learn what you can ACTUALLY use in your container, rather than what the machine has installed.

      4 replies 0 retweets 18 likes
    6. cpuguy83‏ @cpuguy83 27 Apr 2017
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      Replying to @thockin

      And unfortunately not necessarily that easy unless the container is setup in a particular way (e.g. read access to cgroup)

      2 replies 0 retweets 3 likes
    7. Tim Hockin‏ @thockin 27 Apr 2017
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      Replying to @cpuguy83

      True. Without cgroup namespaces, having them mounted inside the container is an info leak at best, and possibly a security/isolation problem

      1 reply 0 retweets 2 likes
    8. Tim Hockin‏ @thockin 27 Apr 2017
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      Replying to @thockin @cpuguy83

      One thing #kubernetes does is let you map resource limits to env vars and virtual files.

      2 replies 0 retweets 3 likes
    9. Brian Grant‏ @bgrant0607 27 Apr 2017
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      Replying to @thockin @cpuguy83

      Original issue: https://issues.k8s.io/9473 

      1 reply 0 retweets 0 likes
      Brian Grant‏ @bgrant0607 27 Apr 2017
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      Replying to @bgrant0607 @thockin @cpuguy83

      Original original issue: https://github.com/kubernetes/kubernetes/issues/386#issuecomment-57265558 …

      11:17 AM - 27 Apr 2017
      0 replies 0 retweets 0 likes

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