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

[Fajar A. Nugraha]

Have you ever start lxc on that host succesfully before? Or is this a
first attempt?

IIRC on my centos 6.6:
- I need newer kernel. Went with kernel ml
(http://elrepo.org/linux/kernel/el6/x86_64/RPMS/) which had 4.4 back
then.
It had /sys/fs/cgroup, so I can mount tmpfs there (with fstab), and
mount cgroups on top of it with cgconfig. I can't remember whether lxc
works when it was mounted on /cgroup, but it works correctly with
/sys/fs/cgroup
- For each cgroup, I need cgroup.clone_children=1 on
/etc/cgconfig.conf. Otherwise I can't start the container (forgot the
exact error message, something about "resource" or "quota", I think)
- lxc-net (the one that creates lxcbr0) would fail to start with
original centos kernel. It works fine with 4.4 though.
- need to install lxcfs as well

That was with 2.0.0-rc5, haven't had time to upgrade yet.

-- 
Fajar

On Thu, Apr 21, 2016 at 7:54 AM, F Dave <feldavic at gmail.com> wrote:
> Turns out that it was cgroup was mounted under /cgroup, so I was able to
> 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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