Failed to mount cgroup at /sys/fs/cgroup/systemd: Permission denied

[srkunze]

What am I missing here? Using Ubuntu 14.04.

lxc-test is a Ubuntu 15.10 container.

root@host:~# lxc-ls -f
NAME      STATE    IPV4  IPV6  AUTOSTART  
----------------------------------------
lxc-test  STOPPED  -     -     NO         
root@host:~# lxc-start -n lxc-test 
Failed to mount cgroup at /sys/fs/cgroup/systemd: Permission denied
systemd 225 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN)
Detected virtualization lxc.
Detected architecture x86-64.

Welcome to Ubuntu 15.10!

Set hostname to <lxc-test>.
Failed to install release agent, ignoring: No such file or directory
Failed to create root cgroup hierarchy: No such file or directory
Failed to allocate manager object: No such file or directory
[!!!!!!] Failed to allocate manager object, freezing.

[stgraber]

Ubuntu 14.04 has LXC 1.0.7 which doesn't support running systemd inside the container.

You can install the LXC 1.1.4 backport available in trusty-backports which should fix that (enabled backports in /etc/apt/sources.list, then apt-get update, then apt-get -t trusty-backports install lxc) or use the stable LXC PPA at ppa:ubuntu-lxc/stable

Anyway, not a bug, that's why we released LXC 1.1 :)

[srkunze]

Alright. Thanks for the very quick response. Let me see if I can get this running.

[srkunze]

@stgraber Can I use the container created with lxc 1.0.7?

[stgraber]

Yeah, it should be fine. LXC shouldn't have changed anything inside the generated rootfs.

[dann1]

hello I had the same problem and I installed lxc 1.1.5, then the containers fail to start again but the terminal says somthing else: "lxc-start: lxc_start.cc: main: 344 The container failed to start" , I've used containers with no problem on debian 8.2 but I'm trying to run them on ubuntu 14.04, after an apparently successful lxc-create I try to start it using lxc-start -n name but terminal shows the previous error

[hallyn]

When reporting failures, please show the output of

lxc-start -n -F -l trace -o /dev/stdout

and the package versions for lxc, cgmanager, and lxcfs.