Dimitri Maziuk wrote:
> Bernie Wu wrote:
>> The company I work for wants us to start investigating HA.
>> My first POC setup was a 2 node cluster with a floating IP and that worked
>> out quite well.
>> Now the second POC was to work with an application, in this case, apache2 in
>> a active/passive configuration.
>> My question is this. Do I need to setup a third node to serve as the quorum
>> node or can I work with 2 nodes.
>
> If your setup is v1-style active/passive, all you need to do is add
> httpd to haresources line (and make sure it's not started by init).
> That's for proof of concept. IRL you may want to throw in at least mon,
> possibly stonith -- although I haven't seen a split brain problem in my
> setup (but then again, mine usually fail over when I upgrade the kernel).
Apache typically won't do anything until a request hits it, which won't
happen on the machine that doesn't have the floating IP, so it isn't
likely to have a split-brain issue and doesn't even matter if it is
running all the time on the passive machine. However, you need to think
about any state information that is updated/maintained on the active
system. Is there a backend database or anything written to the
filesystem that has to be kept in sync?
--
Les Mikesell
[email protected]
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