[Pacemaker] "cluster partitioning"?

[Tomasz Chmielewski]

Not sure if "cluster partitioning" is the right description here, so 
I'll try to explain what I want to achieve.

Right now, I have 4 web/application servers, with heartbeat/pacemaker 
assigning IPs:


(web1) - (web2) - (web3) - (web4)


There is also a "mysql1" server, used by the webservers, which does not 
have heartbeat installed.


"mysql1" server will be a master-master setup, with "mysql1" being 
accessed by the webservers, and the other mysql server as a failover.
What I'd like to do, is "web4" being the "failover mysql server" - so 
the whole cluster would look like below:


                             /web4) - (mysql1)
(web1) - (web2) - (web3) - (web4/


Now, if mysql1 dies, I would like one if it's IP addresses (used for 
MySQL) be assigned to web4, and only to web4.
mysql1 should never have web* server IP addresses assigned (except the 
one used for MySQL, allowed to be moved to web4, and only to web4).


Can I do it with heartbeat/pacemaker? If so, how?



-- 
Tomasz Chmielewski
http://wpkg.org