Testing F21 and Juno today I saw an error where neutron-server came
up
before mariadb was fully ready to accept connections. See [1]. Starting
neutron-server again (after mariadb was up) worked fine.
https://bugzilla.redhat.com/show_bug.cgi?id=1144181
There is an upstream patch in progress for oslo.db which I'll include
in RDO rpm until oslo.db release with the fix is available.
Cheers,
Alan