gluster/consolidated

Three things to know about this role:

It consolidates the gluster/server and gluster/client roles.
It gets gluster working on F25 and F26.
It requires a ton of open ports on the hosts for gluster peer probe to work. See inventory/group_vars/odcs-backend for an example.

Our older gluster/server and gluster/client roles only seemed to work for el7. The advice from #gluster was to use the gluster_volume ansible module instead of configuring the .vol file directly ourselves. That is what this role does.