I saw the post from January (https://blog.linode.com/2014/01/03/docker-on-linode/) where they announced support "out of the box" for Docker.

Today, I created a new Centos 6.5 linode and installed Docker (yum install docker-io).

However, when I start Docker, I get:

[root@linode docker]# service docker start
Starting cgconfig service: Error: cannot mount memory to /cgroup/memory: No such file or directory
/sbin/cgconfigparser; error loading /etc/cgconfig.conf: Cgroup mounting failed
Failed to parse /etc/cgconfig.conf [FAILED]
Starting docker: [ OK ]

Building from Dockerfile gives:

Uploading context 2.56 kB
Uploading context
Step 0 : from fedora
---> b7de3133ff98
Step 1 : run mkdir /usr/local/docker
---> Running in b2eb62150f97
lxc-start: cgroup is not mounted
lxc-start: Error setting devices.deny to a for lxc/b2eb62150f974c171b7f86e9d6f8576f6bad6cc83c447d8a4e1c448ddf5da773

lxc-start: failed to setup the cgroups for 'b2eb62150f974c171b7f86e9d6f8576f6bad6cc83c447d8a4e1c448ddf5da773'
lxc-start: failed to spawn 'b2eb62150f974c171b7f86e9d6f8576f6bad6cc83c447d8a4e1c448ddf5da773'
2014/04/26 17:45:19 The command [/bin/sh -c mkdir /usr/local/docker] returned a non-zero code: 255

Running lxc-checkconfig gives:
--- Namespaces ---
Namespaces: enabled
Utsname namespace: enabled
Ipc namespace: enabled
Pid namespace: enabled
User namespace: enabled
Network namespace: enabled
Multiple /dev/pts instances: enabled

--- Control groups ---
Cgroup: enabled
Cgroup namespace: required
Cgroup device: enabled
Cgroup sched: enabled
Cgroup cpu account: enabled
Cgroup memory controller: missing
Cgroup cpuset: enabled

--- Misc ---
Veth pair device: enabled
Macvlan: enabled
Vlan: enabled
File capabilities: enabled

My kernel: 3.13.7-x86_64-linode38

I'd rather not have to roll my own kernel, especially since its supposed to work.

Has anyone else had this problem?

For what it's worth, it works out-of-the-box with Ubuntu 14.04 with the same stock Linode kernel. (Indeed, "apt-get install docker.io" and it's there, no third-party repositories required.)

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I am experiencing this issue today on a fresh install with the latest image! Exact same error.

What version of Docker are you running? Given that Docker hasn't even used lxc for several updates, if you're still seeing this error you're running a very out-of-date version.

- Les

Confirmed, same issues like @warriorwiki.

I've installed 1.0.0-3.el6 from EPEL per the directions here. This is on a fresh install with a linode centos image from last week. I didn't modify anything relating to cgroups, just changed some ssh configs after creating it.
https://library.linode.com/containers/docker
https://blog.linode.com/2014/01/03/docker-on-linode/


cgconfig doesn't get parsed correctly....

sudo service docker start
Starting cgconfig service: Error: cannot mount memory to /cgroup/memory: No such file or directory
/sbin/cgconfigparser; error loading /etc/cgconfig.conf: Cgroup mounting failed
Failed to parse /etc/cgconfig.conf                         [FAILED]
Starting docker:                                      [  OK  ]

docker does start, but if i try to run anything

sudo docker run -i -t fedora /bin/bash
Unable to find image 'fedora' locally
Pulling repository fedora
3f2fed40e4b0: Download complete 
511136ea3c5a: Download complete 
fd241224e9cf: Download complete 
2014/07/08 12:23:31 Error: Cannot start container 9c341794c33de75809dc21137b71823e3cd30ac51aff2dde6684ed2873549881: mountpoint not found

so, yes, i agree that the issue is not with docker, per se, but with cgconfig on the default centos install. i know this is my instance to take care of... but the linode blog post (https://blog.linode.com/2014/01/03/docker-on-linode/) said that it supported docker "out of the box" which is a big plus for me. it appears that out of the box, cgconfig doesn't work and so docker cannot either.

note that cgroup memory management is strictly optional for docker. In fact, every other distro handles this correctly in their initscripts/packaging for docker.

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me | voltaireMC

@kbar has it right... by disabling cgroup memory management cgconfig starts correctly and docker runs an example container

you can do this by deleting the memory line from /etc/cgconfig.conf