Am 31.05.2012 um 14:23 schrieb agag:
My first idea is to have in example WWW server and when one crashes,
second
is working without any additional admin tasks.
You can do this with a drbd-device as primary/secondary, mounted e.g.
as /ha, and having your webspace, logs, configs etc. somewhere under /
ha. Then configure pacemaker with IP-failover etc. and it works as
long as one of the cluster-nodes is alive.
I had such a configuration since ~2004 with heartbeat and drbd-0.7.
Disadvantage is, taht you need to take care of all dependencies like
cron-jobs, webstats, users etc. and maybe need to modify some scripts.
Second idea is to have almost identical operating systems. For
example to
use drbd replicated data for /etc and /bin (wich will be modified
only in
primary/first serverd when changes or updates are done). Is it
possible
somehow?
You can use it for the whole / (root-filesystem), if you start an
virtual machine on a drbd-device. That's most convenient as everything
is replicated. It works in primary/secondary, with a downtime of
shutdown+bootup.
Helmut Wollmersdorfer
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