Hi Mal,
I run a Apache2 webserver and Postfix as per the virtual mailhost
guide...
For resilience I would like to have two gentoo boxes doing these tasks
for load balancing / redundancy - how can this be achieved? Is there a
tool that will allow replication of the config files / mysql stuff to
allow the boxes to basically be a cluster ?
Thats not so easy to answer. Different solutions exists, each with pros
and cons. It also depends heavily on the professional grad your solution
should be.
You can solve this at different Levels: Hardware, OS, application.
Hardware is expensive. OS far from perfect (i.e. openssi, openmosix).
Applications must be cluster aware, moast aren't.
Do you mean http://www.gentoo.org/doc/en/virt-mail-howto.xml? If so you
have to manage a bunch of apps: postfix, mysql, cyrus, apache.
Just some keywords:
easy with postfix: DNS round robin (solution inside DNS Server, nearly
all MTAs are aware of this)
mysql: not "multi master" ready, just redundancy "master->slave", try
postgres
apache: behaves in sens of "read only" -> LVS
cyrus: moast difficult part (shared storage/CFS,???) ->
NAS|SAN+CFS+LVS+?dono?
Cluster/HA is a complex area. Perhaps you want a simple not so perfect
solotion? Try periodicaly rsynced standby with manual switch over.
Sascha.
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