https://bugzilla.redhat.com/show_bug.cgi?id=1184016
most, if not all of my systemd-units on a dozen of servers using
constructs like below to make the whole tree /var/lib readonly and the
needed subfolder RW which is now broken in Fedora 21 and kills all my setups
that is a *major regression* because this affects a lot of customized,
non-packaged systemd units all over the place
____________________________
ReadOnlyDirectories=/var/lib
ReadWriteDirectories=/var/lib/mysql
150120 13:44:01 [ERROR] Can't start server : Bind on unix socket:
Read-only file system
150120 13:44:01 [ERROR] Do you already have another mysqld server
running on socket: /var/lib/mysql/mysqld_dbmail.sock ?