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How to bootstrap in mirror mode with cn=config
- To: <firstname.lastname@example.org>
- Subject: How to bootstrap in mirror mode with cn=config
- From: "Torsten Schlabach (Tascel eG)" <email@example.com>
- Date: Thu, 16 Sep 2010 09:01:38 +0000
- Organization: Tascel eG
- User-agent: Roundcube Webmail/RCMAIL_VERSION
I am currently chasing some replication problems and I am trying to get my
mind around a couple of questions.
Let's assume this:
We have two LDAP servers, server 1 and server 2, which are supposed to be
mirrors of each other.
The both have their cn=config database and a database with actual data,
let's assume it's the dc=example,dc=com database.
I want to run not only dc=example,dc=com but also cn=config in mirror mode
to make sure that I keep the config in sync and that any changes to the
config (e.g. ACls) can be done on one of the servers and will replicate to
the other one.
Let's assume this was all working well.
Not server 2 fails and needs a complete reinstall. So I sit there with a
slapd binary and no configuration at all.
My idea would be (please tell me if I am on the right path) :
1. I could give server 2 a minimal config which does not contain anything
else but "replicate your cn=config from server1". Let's call this a
2. Once server 2 starts with that bootstrap config, it will fetch
cn=config from server1.
3. It will learn from the replicated config that it has to have an
dc=example,dc=com database, create it and replicate its content from
server1 as well.
4. I would be back in business.
Unfortunately, when I tried, what happened was:
The contextCSN of the bootstrap config on server 2 is newer / higher than
the one on server 1 which has not been touched for a while. So server 2 did
not fetch the config from server 1 but vice versa, which was not exactly
the result I intended. Though it's very consequent and logical behaviour.
Am I on the complete wrtong track?
Would I have to do the slapcat -> slapadd thing between server 1 and
server 2 first (with server 2 offline) and start server 2 only after that?
When I do the slapcat / slapadd thing from server 1 to server 2, do I have
to remove any contextCSN / entryCSN entries (as some postings such as
suggest or would that be just wrong?