g_mirror_others

Three way mirror (BETA - not recommended)

This feature is classified as BETA, we don't think it has been sufficiently tested in real life situations to risk using it on a production system. In general, we think it's better to use the existing 2 way mirroring.

In 7.2 we added g_mirror_others, a mechanism which lets you specify a second slave.

To setup a 3 way mirror you would use settings like this:

(master)
g_mirror_host "slave1.xyz.com"
g_mirror_others "slave2.xyz.com"
g_mirror_mode "master"
... (other normal mirror settings)

(slave1) only needed if long term mirroring!
g_mirror_host "master.xyz.com"
g_mirror_others "slave2.xyz.com"
g_mirror_mode "slave"
... (other normal mirror settings)

(slave2) 
g_mirror_host "master.xyz.com"
g_mirror_others "slave1.xyz.com"
g_mirror_mode "slave"
g_mirror_secret "xxxx" (copy from master)

• Restart the master
• On each machine allow the other servers ip address
• (on slave2) tellmail mirror_allow 1.2.3.1 (ip address of master)
• (on master) tellmail mirror_allow 1.2.3.3 (ip address of slave2)
• Send the config and existing files/folders
• (master) tellmail resync_config
• (Now check if the config has made it to the third slave, if not check mirror.log)
• (master) tellmail resync