Hi Christoph, Does your solution endure a reboot of the host?
I ran into a similar (or identical) issue that I solved by placing these two lines in a /etc/local.d/local.start script on the host: mkdir -p /sys/fs/cgroup/systemd mount -t cgroup -o none,name=systemd systemd /sys/fs/cgroup/systemd If memory serves me, the mount point is not preserved when a reboot occurs. I am working with centos7 on gentoo host. Regards, -Johnson Christoph Lechleitner wrote: > Hi everybody! > > After this cost me an afternoon I thought I should share the solution > here ;-) > > We are running multiple LXC hosts with Debian jessie resp. stretch, > using sysv-init over systemd in the host system. > > 99% of the guest systems are Debian too, but we also have guests with > CentOS 6 and 7 (one each) for development. > > After upgrading the host system from Debian Jessie (with kernel 4.0.x > from jessie-backports) to Debian stretch with kernel 4.9.65-3+deb9u2 > (includes KAISER patches AKA KPTI against meltdown), our CentOS 7 guest > were half broken. > > The container still started up, but every attempt to use any systemctl > command in the container fails with over missing D-Bus connection: > > # LANG="C" systemctl -a > Failed to get D-Bus connection: No such file or directory > --- SNIP --- > > After more research, we found the following at the beginning resp. end > of the regarding lxc.console log file: > > Failed to mount cgroup at /sys/fs/cgroup/systemd: Operation not permitted > [...] > Cannot determine cgroup we are running in: No such file or directory > Failed to allocate manager object: No such file or directory > [!!!!!!] Failed to allocate manager object, freezing. > --- SNIP --- > > The solution, based on > https://github.com/debops/ansible-lxc/issues/15#issuecomment-274751896 > was to create and mount /sys/fs/cgroup/systemd in the host system, like > this: > > # create /sys/fs/cgroup/systemd > mkdir -p /sys/fs/cgroup/systemd > chmod 0555 > > # adapt /etc/fstab part 1, we had the 1st line for years > cgroup /sys/fs/cgroup cgroup defaults 0 0 > > # adapt /etc/fstab part 2, this is new, and "none," was crucial! > systemd /sys/fs/cgroup/systemd cgroup > none,name=systemd,x-mount.mkdir=0555 0 0 > > # mount those cgroup mountpoints if not yet mounted > mount |grep "/sys/fs/cgroup " || mount /sys/fs/cgroup > mount |grep "/sys/fs/cgroup/systemd " || mount /sys/fs/cgroup/systemd > > # (re)start CentOS 7 guest(s) > > # voila > > > Hope this safes someone else some time ... > > > Regards, > > Christoph > > _______________________________________________ lxc-users mailing list [email protected] http://lists.linuxcontainers.org/listinfo/lxc-users
