This is not a HA and it’s not using any ldap replication engine and mysql replication engine.

The methodology is just

backup –> transfer –> restore

The tools needed;

i. rsync

ii. NFS daemon

iii. mysqldump and restore (for mysql)

iv. slapcat (for ldap)

v. crond

Let’s start

ON THE MAIN SERVER

1. First of all sync the data in /var/vmail and /var/www to the backup server using rsync:

rsync -av –delete –stats –progress /var/vmail/ root@destination-host:/var/vmail/ 

beware of –delete option, this cmd will delete data that is in backup server and not in primary server.

2. Then sync the www folder

rsync -av –delete –stats –progress /var/www/ root@destinan-host:/var/www/ 

3. Backup the mysql – all database

mysqldump -u root -pPASSWD –all-databases > /mnt/ur-nfs-mount-folder/all-database.sql  (Please read my previous article how to setup NFS)

4. Then run the backup script of LDAP provided by iredmail tools in /root/iRedmail/tools/ . Edit the files and change the path of destination backup to the /mnt/ur-nfs-mount-folder

5. Set all cmd to the crond, for example 1 hour

0   */1   *   *   *  /root/rsync.sh

 

ON THE BACKUP SERVER

1. Run mysql restore

mysql -pPASSWD < /var/nfs/all-database.sql

2. Create shell script to restore ldap as follow

#!/bin/bash
touch /tmp/ldap-restore && exit
rm -rf /var/lib/ldap/domain.com/__*
rm -rf /var/lib/ldap/domain.com/*.bdb
rm -rf /var/lib/ldap/domain.com/alock
rm -rf /var/lib/ldap/domain.com/log.*
/etc/init.d/ldap stop
/usr/sbin/slapadd -f /etc/openldap/slapd.conf -l /var/nfs/backup-ldap.ldif
chown -R ldap.ldap /var/lib/ldap/domain.com/
/etc/init.d/ldap start

3. Run the script on crond, maybe you might set every 1hour or some minutes for giving some time for primary server to generate the backup and rsync.
-EoF-