Mount a tmpfs at /dev/shm into containers without an init system which would normally set up a shared memory filesystem. This satisfies the OCI Runtime Spec [0], which specifies that the following should be made available in the container: /proc proc /sys sysfs /dev/pts devpts /dev/shm tmpfs
The reason the mount is added conditionally is to avoid interfering with init systems: systemd correctly detects an existing /dev/shm, but OpenRC mounts it even if already present, resulting in duplicate mounts. [0] https://github.com/opencontainers/runtime-spec/blob/fd25dd34a06b/config-linux.md#default-filesystems Signed-off-by: Filip Schauer <[email protected]> --- src/PVE/LXC.pm | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm index de54a0d..e5ff3a1 100644 --- a/src/PVE/LXC.pm +++ b/src/PVE/LXC.pm @@ -756,6 +756,11 @@ sub update_lxc_config { $raw .= "lxc.mount.auto = sys:mixed\n"; } + if (defined($conf->{entrypoint}) && $conf->{entrypoint} ne '/sbin/init') { + # Mount /dev/shm tmpfs into the container, if no init system runs to set it up. + $raw .= "lxc.mount.entry = shm dev/shm tmpfs rw,nosuid,nodev,create=dir 0 0\n"; + } + PVE::LXC::Config->foreach_passthrough_device( $conf, sub { -- 2.47.3 _______________________________________________ pve-devel mailing list [email protected] https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
