Bucl, Casper wrote:
Hi,
I’m trying to create a high availability ldap for a system I have in
place that is currently using multimaster replication. Using a shared
storage system isn’t an option in this case.
To give you an idea of what our setup looks like,
There are two nodes, that have replication set up. These are set up as
multimasters and have processes that write to both of them. These
changes replicate to the other ldap server.
Now I need them to be in a high availability configuration.
I have created duplicates of each node and gotten the high
availability portion on each of them to work correctly.
The problem comes with fedora and replication.
I have tried multiple ways of setting up fedora and replication and
they always seem to end up with changes not being replicated to the
other master when we have failed over to the secondary node. The two
most successful one’s are below
Configurations.
Full Mesh: All links were set up as a two way replication.
This always ends up with at least 2 nodes showing errors saying it
“Can't locate CSN” or “Duplicate node ID”
Node1A ------- Node1B
| \ / |
| X |
| / \ |
Node2A ------- Node2B
Single replication agreement between VIPs
In this configuration, we initially copied over the slapd instance
directory on setup of the second HA node (Node1A to Node1B) so that
the settings and configurations are identical on both. Then as changes
were made to the ldap, we created backups using db2bak. These backups
are copied over to the failover box and then imported on startup of
fedora ds. This doesn’t appear to backup the changelog and ends up
with an error saying “Can’t locate CSN” again.
Node1 VIP
|
|
Node2 VIP
I have tried other things as well and they were a lot less fruitful
than the two examples I have here.
Has anyone set up a high availability scenario similar to this? Can
anyone suggest a different process or configuration that would
accomplish what I’m after?
Yes. Configurations like this have been working at high volume
installations for several years.
Let's start with - what platform are you running on your systems? What
version of DS? What procedure did you use to set up and initialize your
replicas?
Thanks,
Casper
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