Step one install docker, and start the daemon.
dnf install docker systemctl start docker
Also it is a good idea to create a docker group and add the user to it. That way docker commands can be run without sudo.
sudo groupadd docker sudo usermod -aG docker melkor
The next step is to pull a docker image with centos 6.
docker pull centos:6
Then I started a container with bash.
docker run -it centos:6 bash
The 'it' make it an interactive terminal.
After that has run you'll be in a docker container and you can start installing dependencies. Once that was finished I used
docker commit awesome_williams fidelity:alpha
Now I have a docker image that I can develop ruby on rails apps.
To start a container with a port open.
docker run -p 4000:4000 -it fidelity:alpha bash
We can mirror a directory when we start our container can use the -v/--volume option.
SELinux has some issue with this so I also had to include the command:
chcon -Rt svirt_sandbox_file_t host_dir
After that my docker container would run with a directory visible on the host and container.
docker run -t -i -v $(pwd):/home/user/host-caffe -p 8080:22 ubuntu-caffe-cuda:0.2 bash
Then I use docker restart and docker attach to get back into the container, though. I haven't figured out if I can keep ssh running. I might have to add that to the docker image somehow.