How to setup ejabberd clustering

- change /etc/ejabberd/ejabberd.cfg hosts

- sudo ejabberdctl register NEW_ADMIN 192.168.2.xxx P@55w0rd

- change /etc/ejabberd/ejabberd.cfg admin user

- use web admin, make sure you could access the admin panel

- copy /var/lib/ejabberd/.erlang.cookie to all seondary node // might need to restart secondary nodes

- add all node name to /etc/hosts

- stop all secondary nodes

- copy .erlang.cookie to /root/ // use su bash to change to root user or a fresh restart to solve the problem?

- run sudo erl -sname ejabberd -mnesia dir '"/var/lib/ejabberd"' -mnesia extra_db_nodes "['ejabberd@HOSTNAME']" -s mnesia

// crash if ejabberd instance is running and

// /var/lib/ejabberd/ has something in it. BUT .erlang.cookie must maintain in the folder

- mnesia:change_table_copy_type(schema, node(), disc_copies). in the console

- after quitting from console make sure all the new files in /var/lib/ejabberd own by ejabberd.ejabberd

- if hav doubt remove /dev/null from /etc/init.d/ejabberd

Failed to merge schema: Incompatible schema cookies. Please, restart from old backup.'ejabberd@HOSTNAME'

- remove /var/lib/ejabberd/ content ** except .erlang.cookie

USEFUL PATH

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/var/lib/ejabberd/ - database and .erlang.cookie. ejabberd home directory

/etc/ejabberd/ejabberd.cfg - ejabber configuration file

/usr/sbin/ejabberdctl - controller

/var/log/ejabberd/ - log folder

/usr/lib/ejabberd/ebin/ - plugin folder

USEFUL LINKS

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- http://www.process-one.net/docs/ejabberd/guide_en.html#ejabberdctl

- http://jabber.nes.ru/logs/ejabberd@conference.jabber.ru/2006/01/09.html // ejabberd must stop and db must clean before running erl -sname ejabberd

- http://tdewolf.blogspot.com/2009/07/clustering-ejabberd-nodes-using-mnesia.html // point 8, ejabberdctl.cfg modification is obsolete