[atomic-devel] docker-1.11 handling of runc and containerd.

[Daniel J Walsh]

In docker-1.11 docker is going to be using a new daemon, containerd, as 
well as runc.  However docker is forcing a link between containerd and 
runc.  During the building of docker, docker is actually pulling the 
containerd and runc packages currently installed on the box and check 
summing them.  Then docker refuses to run unless these exact versions of 
containerd and runc are installed on the box.  Docker does change the 
name of these executables to docker-containerd and docker-runc.

As we look to package these tools for Fedora, Centos and RHEL, we have 
to decide whether or not we want to package multiple versions of runc so 
that we can develop these at different rates or lock the versions 
together as docker wants.  We could patch out the checksum check and 
rely on rpm to make sure the current version of docker has a late enough 
version of containerd and runc, to be supported.

Not sure what the policies of Fedora and Centos to have multiple 
versions of basically the same executable installed on the system at once.

Dan