Documentation: Add details on running standalone cc-oci-runtime

[mcastelino]

Tested on Ubuntu 16.04

https://github.com/opencontainers/runc#creating-an-oci-bundle

• Create the rootfs for the bundle

mkdir $HOME/mycontainer
cd $HOME/mycontainer
sudo docker pull busybox
sudo docker export $(sudo docker create busybox) | tar -C rootfs -xvf -

• Create the spec file config.json for the bundle runc spec

Note: You may need to build runc https://github.com/opencontainers/runc#building if you do not have it on your system.

• Start the container

name=foo
pidfile=/tmp/cor.pid
logfile=/tmp/cor.log
bundle_dir=$HOME/mycontainer/

sudo cc-oci-runtime -d --log "$logfile" --log-format json create --bundle "$bundle_dir" --console $(tty) --pid-file "$pidfile" "$name"
sudo cc-oci-runtime --log "$logfile" --log-format json start "$name"

[jodh-intel]

#272, which fixes #265, will now auto-create a bundle (with a few caveats).