Disabling a Real server

[rhurst at bidmc.harvard.edu]

Hopefully, I am understanding your use-case and question ...

If the service goes "offline", the cooresponding pulse -> lvsd -> nanny process is supposed to detect event, and then remove the real server from the vip:port pool.  See syslog for that event messages.

If you want to do that manually, i.e., a planned quiesce of the service, just set the weight factor of the real server to zero.  Monitor its current active clients until it reaches zero, because no new connections will be allowed into that server while it is set to zero.  Then, shutdown the service.

To drain clients, issue a command like:

ipvsadm -e -t eben:8000 -r web02:8000 -g -w 0

... where eben is the virtual host name and web02 is the real server name.

Do the reverse when you are ready to bring it back into the pool: server up, service up, and set its weight factor >0.

-----Original Message-----
From: piranha-list-bounces at redhat.com [mailto:piranha-list-bounces at redhat.com] On Behalf Of Diego Bello
Sent: Tuesday, January 19, 2010 7:52 AM
To: piranha-list at redhat.com
Subject: Disabling a Real server

Hi people,

I have a LVS cluster using CentOS 5.3 and I need, from time to time, take one of the real servers out for maintenance and then take it in again. How can I "disable" a real server from the cluster so it is no longer monitored until It is back again?.

I thought on shutting down the service, Postgresql in this case, but the monitoring scripts I have send an email alert whenever a Real Server is not available, and I don't want to be receiving tons of emails whenever a real server is being updated.

The only way I can think about is to modify the router configuration file (lvs.cf) and reload pulse, but I'm not totally sure that's the most elegant choice. I need it to be done automatically using scripts, but I can't find any hint in man pages of lvsd, nanny or ipvsadm.

Thanks.

--
Diego Bello Carreño

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