Re: High availability

[Dmitriy Kirhlarov <dimma@higis.ru>]

Taymour A. El Erian wrote:
> Hi,
>
> I have been searching for a long time to find a solution to give me 
> high availability on the writing. We have 2 ldap servers running as 
> multi master (I know it is not considered a good thing and it is very 
> old 2.0.x), this way if one is down the other will accept writes 
> (add/modify/delete). If we do the normal single master multiple 
> slaves, we will get more performance and high availability for reads 
> but if the master is down no updates. Also, we can not separate writes 
> from reads and we can not use referrals (not all applications we have 
> can chase referrals). I though of having a standby master and use 
> heartbeat but it doesnt look like a stable solution, any ideas ? maybe 
> shared disk ?

For openldap 2.{2,3}.x you can use ggated+gmirror+carp (on freebsd) or 
heartbeat + mirror with drdb (on linux). It should work.

For openldap 2.4 two-node multi-master solution declared, afaik, but 
currently 2.4 is alpha.

WBR.
Dmitriy