Comment 5 for bug 1430796

As this charm is based on one of my teams (percona-cluster), I'll comment on:

I: config.yaml: option root-password has no default value
I: config.yaml: option source has no default value
I: config.yaml: option sst-password has no default value
I: config.yaml: option access-network has no default value
I: config.yaml: option vip has no default value

right now, its not possible to generate passwords (root and sst) in cluster services without avoiding horrid race conditions; leadership election will help us in this respect, but for now the safest way to assure that the same password is used across all units is to provide it via config, for which we must *not* provide defaults for security reasons.

'source': optional - PPA or suchlike.

'access-network': optional network to use for access to MySQL

'vip': environment specific configuration for clustering using HA cluster - again no sane default.

These all exist in the parent charm, so I would ack them for galera-cluster as well.