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multiple replication scenarios questions
- To: OpenLDAP Software <firstname.lastname@example.org>
- Subject: multiple replication scenarios questions
- From: Guillaume Rousse <Guillaume.Rousse@inria.fr>
- Date: Wed, 13 Jan 2010 10:09:38 +0100
- User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:184.108.40.206) Gecko/20100110 Mandriva/3.0-7mdv2010.1 (2010.1) Thunderbird/3.0
I had a look at section 18 of the admin manual, as I was trying to
figure difference between scenarios 18.2.2 (N-way multi-master) and
18.2.3 (mirror mode). Whereas the descriptions of both scenarios are
quite clear, given examples configuration are quite confusing (at least
First, they are quite hard to compare, as the first one uses LDIF
syntax, whereas the second uses the classical file configuration syntax.
Second, they both use the same directives:
- a different serverId for each nodes
- mirrormode on for each nodes
- syncrepl directives for each nodes
The only difference being than for multi-master, each node has syncrepl
directives for each nodes (including himself), whereas for mirrror mode,
each node only has syncrepl directives for other nodes. But it's hard to
figure if that's because of the replication scenario, or just because in
the first case, the configuration has to be identical everyhwere given
that it's replicated automatically.
So, what is supposed to be different at configuration level between
those two scenarios ?
Additonal question: doesn't a classical single-master + multiple slaves
scenarios, where each slave use chain overlay to automatically forward
all changes to the master, also achieve exactly what is described in the
mirror mode description ?
BOFH excuse #248:
Too much radiation coming from the soil.