[Linux-HA] heartbeat with postgresql
andrew at beekhof.net
Wed Oct 20 00:13:58 MDT 2010
On Tue, Oct 19, 2010 at 6:44 PM, Greg Woods <woods at ucar.edu> wrote:
> On Tue, 2010-10-19 at 10:01 -0600, Serge Dubrouski wrote:
>> Any particular reason for using Heartbeat v1 instead of CRM/Pacemaker?
> Um, maybe because heartbeat v1 has a much much much much less steep
> learning curve?
I dispute that:
> If you have a simple two-node cluster where one node is
> just a hot spare, it is way way way way easier to get it working with
> heartbeat v1.
> The first time I ever set up a high availability cluster, going in
> knowing nothing at all about it, I had a heartbeat v1 cluster working in
> a couple of days. Already having had considerable heartbeat v1
> experience, it took me a couple of months to get a cluster working under
> heartbeat v3/Pacemaker. The pace of development is also high enough that
> the documentation often lags behind reality. That is not a criticism, I
> know how hard it is to keep the documentation up to date (I am already
> in that mode now with these new clusters; nobody else knows how they
> work so I can't even take a vacation now that I have some production
> services running on them, until I finish writing up some administration
> Yes, no doubt a Pacemaker cluster is far more flexible, but when one
> doesn't need all that flexibility and just wants a simple two-node HA
> cluster, the simplicity of heartbeat v1 is very attractive.
> This shouldn't be a big a mystery as it seems to be. Face up to it:
> learning and properly configuring Pacemaker is HARD, even for
> experienced sysadmins. And unless you need the additional flexibility
> that Pacemaker offers, it seems like a lot of extra effort.
> Will I use Pacemaker all the time in the future? Yes, because I have
> already put in the effort to learn and configure it. Setting up a new
> cluster, where I had an existing one to use as a template, took less
> than a week. But that first time, it was difficult, time consuming, and
> often frustrating.
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