Re: Cluster project

[Oliver Jehle]

Why not writing a heartbeat-addon that checks a node with http ??? then
you can use monit with heartbeat in combination as i described long time
ago...

i think it's a bad idea only have  a webservice to decide, a cluster has
to switch some resources or services !! isn't it a little bit risky ? 




On Fri, 2004-02-06 at 17:52, Caleb clark wrote:
> Hi guys,
> 
> I have been using Monit on all my linux/aix/solaris servers for several
> months now. Great software! Thanks again for your guys work on this!
> 
> Anyway, I have been thinking of building a cluster, since i have
> several several linux systems providing services such as, bind,
> sendmail, MySQL, radius, squid ... etc. I also have a SAN which all of
> my servers are booting from and running on the SAN. This makes shared
> data storage very easy for me.
> 
> I searched and searched clustering sofware and did not find anything
> that would do what i wanted it to do.
> I dont want to fail over based on a UDP hearbeat, or serial heartbeat.
> My main concern is not that the hardware will fail, but some component
> of the software will. So i want to fail over based on a service, not
> hardware.
> 
> So i turned to Monit to do the logic for me. Works great for a one way
> failover. (need the "up" event feature to go bidirectional). The only
> other software i am using is fake, to handle the IP address take over.
> Which is bassicly a set of bash scripts that wrap around send_arp, which
> bassicly spoofs an arp on a host. Im working on something that will keep
> track of all the arp's on a segment, and have send_arp blast all of
> those when its time to fail over.
> 
> What I am getting to is, that you guys are VERY close to having a
> really cool cluster project here. Have you guys put any thought into
> that? With m/monit and monit together, thats the perfect solution for
> what I am trying to do. Control a 2 node (or more!) cluster via secure
> web services. Only thing really missing is the arp spoof for IP address
> take over.
> 
> I would be more than happy to (attempt) to write some code for this (I
> will end up doing it anyway) if you guys would be interested in this at
> all. Though im a perl programmer, very little C. But i have access to
> some decent C programmers here.
> 
> Thoughts?
> 
> -caleb
> 
> -Caleb Clark
> -Network Analyst
> -County of Mendocino
> -Information Services
> 
> 
> 
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