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docs: add comment about requiring the mount hierarchy to be mounted MS_SHARED

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This has been tripping up container manager people. let's document this
explicitly.

(Note that the container interface could really use some updates, i.e.
it was written before a time where cgroup namespacing was a thing. But I
am too lazy to fix that now, so let's just add this once facet.)
This commit is contained in:
Lennart Poettering
2025-11-01 22:21:32 +01:00
committed by Luca Boccassi
parent ee3cd7890d
commit 32f4e30be5
1 changed files with 6 additions and 0 deletions
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6
docs/CONTAINER_INTERFACE.md
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@@ -86,6 +86,12 @@ manager, please consider supporting the following interfaces.
confuse systemd and the admin, but also prevent your implementation from confuse systemd and the admin, but also prevent your implementation from
being "stackable". being "stackable".
8. The mount hierarchy of the container should be mounted `MS_SHARED` before
invoking `systemd` as PID 1. Things will break at various places if this is
not done. Note that of course it's OK if the mounts are first marked
`MS_PRIVATE`/`MS_SLAVE` (to disconnect propagation at least partially) as
long as they are remounted `MS_SHARED` before `systemd` is invoked.
## Environment Variables ## Environment Variables
1. To allow systemd (and other programs) to identify that it is executed within 1. To allow systemd (and other programs) to identify that it is executed within