Replication question

Bron Gondwana brong at
Wed May 17 22:13:25 EDT 2006

On Wed, May 17, 2006 at 03:40:17PM -0400, Patrick Radtke wrote:
> when we switch we comment out the sync_server line on the replica to  
> make sure it won't listen.

We have a "as master" config and an "as slave" config - and switch them
via symlinks.  Similar basic concept though - or at least it will be
once everything is actually running...

> When it comes to get the master up to speed, then we reverse the roles.

Yep - that's the idea.  Replicate everything back then switch roles
again.  I'm going to be interested to see how fast we can effect the
switchover.  Certainly users will lose their connections.

We also have an IP address which migrates with the 'master' status -
such that the init script that brings up the master IP address also sets 
the correct symlinks to ensure that the server is running in master
mode.  The replication is done to another IP address again - and the 
init script that brings up that IP also ensures that the server is
running in replica mode.  So nothing can replicate unless one server is
in master mode and the other in replica mode - the IP addresses ensure
it.  This has the other very nice advantage that the configuration files
are _identical_ on the two servers, since we don't have to specify a
different replication target.

> We also generate a file with all our usernames in it and feed it to  
> sync_client on the replica and that way it will go through every user  
> and make sure they get re-synced.

Now that's a fantastic idea.  Why didn't I think of that.  I'll be
writing something like that in the next few minutes.  I do think you
meant to say "sync_client on the master" there. 


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