Run docker in ubuntu live disk

Question

I was wondering if it's possible to install and run Docker in a Ubuntu 14.04 USB Live-Disk.

I'm trying it with a 8GB USB, 4 GB for installation and 4 GB for persisted storage, but I keep getting errors when running the containers (no problem in pulling them).

Here is my Docker version:

$ sudo docker version Client version: 1.6.2 Client API version: 1.18 Go version (client): go1.4.2 Git commit (client): 7c8fca2 OS/Arch (client): linux/amd64 Server version: 1.6.2 Server API version: 1.18 Go version (server): go1.4.2 Git commit (server): 7c8fca2 OS/Arch (server): linux/amd64 

And the current error I'm getting when running a docker container is:

[8] System error: mountpoint for cpu not found  

OBS: Sometimes the error is that the cpuset or that the devices were not found.

The kernel of the live-disk that I'm using is:

$ uname -r 3.13.0-32-generic 

If the Ubuntu live disk is not the best live-disk to run Docker, are there any other alternatives that have some GUI with it, not just a simple terminal to run docker?

I'm saying this because I'm trying to introduce Docker to my parents, but they don't want to install a linux in their PCs, and so I need some simple graphic interface to write down the Dockerfile, open a browser, etc...

---

UPDATE

I saw that during the install there was a error when setting up the cgroup-lite dependency initctl: Unknown job: cgroup-lite. Also I read that some ubuntu need to install apparmor so that the docker installation works properly.

So I installed it and reinstalled docker (cgroup-lite installed with no problem then), and now I'm getting this when running the sudo docker -d

INFO[0000] +job serveapi(unix:///var/run/docker.sock)    INFO[0000] Listening for HTTP on unix (/var/run/docker.sock)  INFO[0000] +job init_networkdriver()                     INFO[0000] -job init_networkdriver() = OK (0)            WARN[0004] Your kernel does not support cgroup swap limit.  INFO[0004] Loading containers: start.                    ...... INFO[0004] Loading containers: done.                     INFO[0004] docker daemon: 1.6.2 7c8fca2; execdriver: native-0.2; graphdriver: aufs  INFO[0004] +job acceptconnections()                      INFO[0004] -job acceptconnections() = OK (0)             INFO[0004] Daemon has completed initialization  

And when trying to run a container I receive>

ERRO[0125] HTTP Error: statusCode=500 Cannot start container 90875e79dec37cec41a67aac235b81f0fc17c4e011cd6e5368a4b29336587f5b:  [8] System error: permission denied 

Not sure about the kernel not supporting cgroup, but if so, then is it possible to update the kernel in the livedisk (persisting it?) ?

Answer 1

I've managed to make this work by changing the Docker storage to devicemapper instead of AUFS.

If your system doesn't use Systemd

You just have to change /etc/default/docker to have this in it:

DOCKER_OPTS="--storage-driver=devicemapper" 

If your system uses Systemd

See this answer and add --storage-driver=devicemapper at the end of the docker start command.

I've manage to make the containers run ok with this, but I prefer using AUFS.

I realized that the partition was not using aufs by default, but something like caw or cow (can't remember now).

I also tried to make it work using AUFS using the union=aufs flag in grub, but when running the docker daemon I get a FATA[0000] Shutting down daemon due to errors: error intializing graphdriver: backing file system is unsupported for this graph driver, that looks related to https://github.com/docker/docker/issues/7321

I'll leave my answer here, since it is a workaround for this problem, but if anyone manage to make this work using AUFS it would be, in my opinion, a better answer.

Answer 2

You want to tell the Docker daemon to store the data related to your containers on the persistent storage.

By default the docker daemon put those data into /var/lib/docker. You can change that location with the --graph docker daemon option