Fix jailer --parent-cgroup parameter when no cgroups specified
#4309
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Type: Bug
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## main #4309 +/- ##
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- Coverage 81.59% 81.55% -0.04%
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JonathanWoollett-Light
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Dec 11, 2023
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I realized I should also amend the jailer.md documentation |
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This is to bring clarity while developing a new test. Signed-off-by: Pablo Barbáchano <[email protected]>
The fixture has information like the cgroups version available on the system and where it is mounted. In addition it has helper functions to create cgroups and move a PID into a cgroup. Signed-off-by: Pablo Barbáchano <[email protected]>
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xmarcalx
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Priority: High
If we specify `--parent-cgroup` without any `--cgroup` option, the jailer doesn't do anything, though a user specifying it could reasonably expect it to move the process under that cgroup. We could just error in that situation, and expect something else to launch the jailer process in a cgroup, but we risk breaking anybody that is already using it that way. Instead, we move the process to the `--parent-cgroup` since it's the most intuitive, although the specified `--parent-cgroup` is not a parent in that case. Link: firecracker-microvm#4287 Signed-off-by: Pablo Barbáchano <[email protected]>
Tests that --parent-cgroup without any cgroups moves Firecracker to the cgroup (cgroupsv2 only). Signed-off-by: Pablo Barbáchano <[email protected]>
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The described issue was fixed by firecracker-microvm#4309. Signed-off-by: Patrick Roy <[email protected]>
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The described issue was fixed by firecracker-microvm#4309. Signed-off-by: Patrick Roy <[email protected]>
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The described issue was fixed by firecracker-microvm#4309. Signed-off-by: Patrick Roy <[email protected]>
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The described issue was fixed by #4309. Signed-off-by: Patrick Roy <[email protected]>
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Changes
If we specify
--parent-cgroupwithout any--cgroupoption, the jailer doesn't do anything, though a user specifying it could reasonably expect it to move the process under that cgroup.We could just error in that situation, and expect something else to launch the jailer process in a cgroup, but we risk breaking anybody that is already using it that way.
Instead, we move the process to the
--parent-cgroupsince it's the most intuitive, although the specified--parent-cgroupis not a parent in that case.Closes: #4287
Reason
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CHANGELOG.md.TODOs link to an issue.rust-vmm.