Hi all,
i'm planning to realize the following scenario.
I have a Xen VM with Sles 10 and Postgresql 8.3 and would likje to
upgrade to Sles 11 and Postgres 9.
This step i don't think it will be a problem.
But know i would like to make this VM high available.
My first idea was to create a second VM. This vm get the same
configuration as the master system and some tools work to synchronize
both servers. But the realisation of HA it's more complex as i think.
I read something about DRBD, Wal-Files, 2x rsync, Slony, PGPool 2. I saw
that other tools also works. But it's unclear what the best solution is
for a HA System with 2 VMs, which are running on different servers. If
the first server crashs the other server can run the secondary instance.
Both servers should indenpendent run.
My first meaning was from this articles which i read, that i should use
PGPool 2 in combination with DRBD and Heartbeat, but without practical
relevance.
Who did you realize your HA System?
What solution would you prefer in my situation?
best regards
Benjamin