apache2 + ldirectord + heartbeat

eantoranz · 08-25-2009, 02:59 PM

Hi!

I'm configuring a loadbalancing web server.

In my previous experiments, I was able to get heartbeat to control a apache2 service directly. Now, I want to go to the next stop: use ldirectord to load balance between 2 apache servers.

It's a 4-host environment. All 4 hosts are connected to the same lan switch. As a matter of fact, it's all working on virtual machines. I have 4 virtual machines (qemu) connected to a bridge that enables connection to my real machine.

Now, I have configured ldirectord so that it recognizes when an apache server goes up or down on both loadbalancers and heartbeat is able to switch the ldirectord service between both nodes.

Now, after i start the whole thing, i just don't see any changes at all in networking in the active ldirectord host (besides the addition of the virtual IP, of course).

Now, I _guess_ there should be a mechanism through which requests arriving at the virtual IP are sent to the real servers, however, I see nothing like that. Nothing with netstat -lntp, nothing with NATting, nothing at all. So I guess I simply skipped something on the ldirectord configuration to finish the whole thing. What could it be?

Here's the ldirectord.cf file:

Code:

checktimeout=3
checkinterval=5
autoreload=yes
logfile="/var/log/ldirectord.log"
quiescent=yes
virtual=192.168.200.106:80
        fallback=127.0.0.1:80
        real=192.168.200.101:80 gate
        real=192.168.200.102:80 gate
        service=http
        request="ldirector.txt"
        receive="ldirector"
        scheduler=wlc
        protocol=tcp
        checktype=negotiate

What am I missing?

Thanks in advance.

Rush_898 · 08-25-2009, 03:27 PM

So I use a similar formula substituting keepalived for ldirector. The functions provided here are:

Apache - Web hosting
Heartbeat - Director Failover
Ldirectord - Configuration frontend for LVS (which is maybe what you are missing? http://www.linuxvirtualserver.org/software/ipvs.html)

If you do have LVS then possibly IP Forwarding is not enabled?

eantoranz · 08-25-2009, 04:46 PM

I got it to work. I'm checking the details and then I'll post what was missing. Thanks for your help... you certainly guided to the place where I had to look.