failover

source: http://wiki.qmailtoaster.com/index.php/QMT_Failover_replication_Setup

QMT Failover replication Setup

Craig Smith – 26th October 2006 – craig@doc-net.com

Thanks to Jake for taking the time to review this for me before posting. It always helps to have a sounding board and Jake was kind enough to be that board for me.

This page gives you a procedure to configure a backup qmt server that will be available for failover in the event of primary server failure. The backup server will only ever be 10 minute out from the primary.(depending on cronjob timing)

Please note initial replication (the first run) will take some time, so schedule this for off peak hours. Once the first run has finished and unison has a db of what it is working with subsequent runs are pretty quick. So enable the cron job settings at a time that you can manage the traffic for initial replication.

Also this setup is based on 2 servers where the port used is internal and not visible publically. If you cannot do this on a private network, then read up on using ssh for replication as this is not a secure transport and should not be used on open networks.

This was setup and tested on Fedora core 5 on both servers, and it works without any hiccups.

The details are pretty much cut and paste.