Failover-HA-Setup

[Doug Barton]

Ulrich Spoerlein wrote:

> Only two options remain: modify existing mysql-server script (bad idea,
> will be overwritten on update) or go through a proxy script which
> "transforms" start|stop -> onestart|onestop
> 
> You could also alter the environment of heartbeat (it's really just a
> bunch of poorly written shell scripts) and set mysql_enable=YES there,
> but that'd be just as fragile as rewriting the existing mysql-server
> script.

Yeah, I thin we're definitely in territory that is not covered by the
boot scripts as written here.

This thread has got me thinking though, how useful would something
like 'foo_enable=conditional' be? What I'm thinking is that you could
define a script in foo_condition that rc.d would run. We could either
do a straight yes/no, where if the script exits successfully (exit
code 0) then we run the service, and if it fails (non-zero exit code)
we don't. OR, we could have the script return the argument we want to
feed that service's startup script.

I think that may have some utility here, what do y'all think?


Doug

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