--On Friday, September 15, 2017 10:09 AM +0200 Michael Ströder
<[email protected]> wrote:
Quanah Gibson-Mount wrote:
I think it's a strong plus to be able to reconfigure a
standalone server into an MMR cluster with zero downtime,
I don't buy this argument. If you're really eager reaching high
availability you have to implement a decent load-balancer and test
correct fail-over anyway. And then your MMR cluster will have zero
down-time (seen from the LDAP clients) during re-configuration even when
restarting the replicas one after another.
I'm talking about the process of taking a
single provider + multiple replica
environment and trivially transitioning that to an MMR environment, where
it can either be a mix of providers and replicas, or all providers, etc.
With the replicas configured to pull from 1+ providers. You can do that
entire transition via cn=config with no downtime. With slapd.conf, you
will have to stop the provider (outage) to reconfigure it into an MMR
capable scenario. And I've never needed a load balancer with properly
written software that understands how to parse multiple LDAP URI's for
failover.
--Quanah
--
Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>
