[lxc-users] lxc-start fails with "no systemd controller mountpoint found"

[Serge Hallyn]

Quoting F Dave (feldavic at gmail.com):
> Turns out that it was cgroup was mounted under /cgroup, so I was able to

Yes the point of the cgfsng driver was to simplify the cgroup code by
requiring now-standard cgroup mountpoints, rather than searching the
system for cgroup mounts.  So $controller must be mounted under
/sys/fs/cgroup/$controller.

THe bug (which should be fixed in git head) was that cgfsng was not
failing over to cgfs.c when it did not find the required mountpoints
where it expected them.

> create the folder there and mount it. However the container shows the same
> error:
> 
> [root at devhost fs]# mount -t cgroup -o none,name=systemd cgroup
> /cgroup/systemd/
> 
> [root at devhost fs]# grep cg /proc/mounts
> cgroup /cgroup/cpuset cgroup rw,relatime,cpuset 0 0
> cgroup /cgroup/cpu cgroup rw,relatime,cpu 0 0
> cgroup /cgroup/cpuacct cgroup rw,relatime,cpuacct 0 0
> cgroup /cgroup/memory cgroup rw,relatime,memory 0 0
> cgroup /cgroup/devices cgroup rw,relatime,devices 0 0
> cgroup /cgroup/freezer cgroup rw,relatime,freezer 0 0
> cgroup /cgroup/net_cls cgroup rw,relatime,net_cls 0 0
> cgroup /cgroup/blkio cgroup rw,relatime,blkio 0 0
> cgroup /cgroup/systemd cgroup rw,relatime,name=systemd 0 0
> 
> [root at devhost fs]# lxc-start -F -n node2
> lxc-start: cgfsng.c: all_controllers_found: 431 no systemd controller
> mountpoint found
> lxc-start: start.c: lxc_spawn: 1079 failed initializing cgroup support
> lxc-start: start.c: __lxc_start: 1329 failed to spawn 'node2'
> lxc-start: lxc_start.c: main: 344 The container failed to start.
> lxc-start: lxc_start.c: main: 348 Additional information can be obtained by
> setting the --logfile and --logpriority options.
> 
> 
> On Thu, Apr 21, 2016 at 11:38 AM, F Dave <feldavic at gmail.com> wrote:
> 
> > I cloned the master branch and rebuilt it. Did 'make uninstall' for the
> > previous lxc-2.0.0 and installed new version. However it still throws the
> > same error. Also tried to create the systemd folder:
> >
> > [root at devhost lxc]# mkdir -p /sys/fs/cgroup/systemd
> > mkdir: cannot create directory `/sys/fs/cgroup/systemd': No such file or
> > directory
> >
> > [root at devhost lxc]# ll /sys/fs/cgroup/
> > total 0
> >
> > [root at devhost lxc]# ll /sys/fs/
> > total 0
> > drwxr-xr-x. 2 root root 0 Apr 21 07:07 btrfs
> > drwxr-xr-x. 2 root root 0 Apr 20 09:07 cgroup
> > drwxr-xr-x. 4 root root 0 Apr 21 07:07 ext4
> > drwxr-xr-x. 2 root root 0 Apr 21 07:07 selinux
> >
> >
> > On Thu, Apr 21, 2016 at 9:14 AM, Serge Hallyn <serge.hallyn at ubuntu.com>
> > wrote:
> >
> >> > cgfsng.c:all_controllers_found:431 - no systemd controller mountpoint
> >> found
> >> > lxc-start: cgfsng.c: all_controllers_found: 431 no systemd controller
> >> > mountpoint found
> >>
> >> This is known.  You can either run from git head to get the patch which
> >> fixes this, or just make sure to have a name=systemd cgroup controller
> >> mounted on the host.
> >> _______________________________________________
> >> lxc-users mailing list
> >> lxc-users at lists.linuxcontainers.org
> >> http://lists.linuxcontainers.org/listinfo/lxc-users
> >
> >
> >

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