[Tracker] Live Container Updates #305
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Related discussion: https://groups.google.com/a/opencontainers.org/forum/#!topic/dev/mWZVREVL9T8 |
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Cross referencing earlier discussion in #17.
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wking
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Aug 24, 2016
Since [1] we've required runtimes to error out if a configuration joins an existing namespace and adjusts it somehow (e.g. joining an existing UTC namespace and setting 'hostname', [2]). However, the wording from [1] (which survives untouched in the current master) only talked about "when a path is specified". I see two possible approaches for internal consistency: a. Lift the OCI restriction and allow join-and-tweak [3] where the kernel supports it. When we landed the current restriction, the main issues seemed to be "we don't have a clear use-case for join and tweak" [4] (although see [5]) and "this is a foot gun [6,7]" (I'd rather leave policy to higher-level config linters). b. Extend the OCI restriction to all cases where the runtime does not create a new namespace. Besides the already covered "namespace entry exists and includes 'path'", we'd also want to forbid configs that were missing the relevant namespace(s) entirely (in which case the container inherits the host namespace(s)). I'm partial to (a) in the long run, but (b) is less of a shift from the current spec and likely a better choice for a pending 1.0. This commit implements (b). It also makes it explicit that not listing a namespace type will cause the container to inherit the runtime namespace of that type. [1]: opencontainers#158 Subject: Clarify behavior around namespaces paths [2]: opencontainers#214 Subject: config: Require a new UTS namespace for config.json's hostname [3]: opencontainers#158 (comment) [4]: opencontainers#158 (comment) [5]: opencontainers#305 Subject: [Tracker] Live Container Updates [6]: opencontainers#158 (comment) [7]: opencontainers#537 (comment) Subject: [linux] Tweaking host namespaces? Signed-off-by: W. Trevor King <wking@tremily.us>
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https://github.com/opencontainers/specs/blob/master/ROADMAP.md#live-container-updates
This needs to be an optional feature.
and per the life-cycle discussions, this is left to the operator where hooks that would happen after the "start" action of the container.
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