oci: make sure cgroupns is enabled if supported#4003
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Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
| return fmt.Sprintf("unix://%s", tracingSocketPath) | ||
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| func cgroupNamespaceSupported() bool { |
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Moby, containerd, etc. disables cgroup namespace on cgroup v1 regardless to kernel version/config.
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Where is this done? In Runc code I see it checks ns existence for both cgroup versions.
https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L268
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Iiuc this means privileged containers get host cgroups on v1? Is this what you mean and we should replicate it for --security=insecure. I don't quite see how it makes sense though to have different behaviour for privileged containers based on group versions.
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Also see these consts in moby https://github.com/moby/moby/blob/462d6ef826861fad021fb565c0481fb61d2db6bc/daemon/config/config_linux.go#L23-L27 now used in https://github.com/moby/moby/blob/462d6ef826861fad021fb565c0481fb61d2db6bc/daemon/config/config_linux.go#L189-L193. So if not v2 then always set host mode.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
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@AkihiroSuda Merging for v0.12 rc2. Lmk if you think any follow-ups are needed. |
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LGTM |
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This is not set by default by containerd default spec but needed for the cgroup mounts to be scoped to the ID by runc.
closes #3985