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On Fri, Jan 21, 2005 at 12:39:00PM -0000, Ralph Jones wrote:
> Hi,
>
> (Advance apologies for cross posting with UltraMonkey user list. Having
> read my message back I think this mailing list may be more appropriate).
>
> Could anybody advise me on the best way to approach configuring ldirectord
> for our load balancing configuration.
>
> We have 2 UltraMonkey load balancers with 5 virtual addresses
> (10.10.11.180 - 10.10.11.185).
>
> We have 2 real servers with 5 IP addresses each (10.10.11.150 -
> 10.10.11.155 and 10.10.11.130 - 10.10.11.135). The real servers have 5
> addresses each to handle 5 slightly different versions of the same web
> application (tailored for localities). Unfortunately this configuration
> cannot be changed...
>
> I have the following ldirectord.cf to handle this:
>
> >checktimeout=10
> >checkinterval=10
> >autoreload=no
> >logfile="local0"
> >quiescent=yes
> >
> ># Address 1
> >virtual=10.10.11.180:80
> > real=10.10.11.150:80 masq
> > real=10.10.11.130:80 masq
> > scheduler=wlc
> > service=http
> > protocol=tcp
> > checktype=negotiate
> > request="test.htm"
> > receive="OK"
> >
> ># Address 2
> >virtual=10.10.11.181:80
> > real=10.10.11.151:80 masq
> > real=10.10.11.131:80 masq
> > scheduler=wlc
> > service=http
> > protocol=tcp
> > checktype=negotiate
> > request="test.htm"
> > receive="OK"
> >
> ># Address 3
> >virtual=10.10.11.182:80
> > real=10.10.11.152:80 masq
> > real=10.10.11.132:80 masq
> > scheduler=wlc
> > service=http
> > protocol=tcp
> > checktype=negotiate
> > request="test.htm"
> > receive="OK"
> > ...
>
> My question is, can I configure ldirectord to group the virtual addresses
> and thereby only poll the 2 real servers? I'm assuming that with the
> above configuration each real server address will be polled for activity
> which is quite a bit of wasted overhead.
>
> The above configuration works perfectly, but I just think there must be a
> neater way to do it!
Ldirectord tries to be clever and only check a given real service once,
even if it appears in multiple virtual hosts. So if you were able
to rewrite your config so that 10.10.11.180:80, 10.10.11.181:80
and 10.10.11.182:80 all used 10.10.11.150:80 and 10.10.11.130:80 then
it would only run two checks, rather than six.
Other than that, there isn't anyway to manually group checks together.
--
Horms
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