Re: Disabling a Real server

On Tue, Jan 19, 2010 at 2:41 PM,  <[email protected]> wrote:
> Hopefully, I am understanding your use-case and question ...
>
> If the service goes "offline", the cooresponding pulse -> lvsd -> nanny p=
rocess is supposed to detect event, and then remove the real server from th=
e vip:port pool. =A0See 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. =A0Monitor its curre=
nt active clients until it reaches zero, because no new connections will be=
 allowed into that server while it is set to zero. =A0Then, shutdown the se=
rvice.
>
> 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.
>

This is what I do, but when one server has weight =3D 0, the monitoring
script keeps working on it. It is still part of the pool. This
monitoring script is used, in this case, to alert when a machine is
down, so even when I set its weight to 0 and shutdown postgres, alerts
keep telling me that the machine is down.


> -----Original Message-----
> From: [email protected] [mailto:piranha-list-bounces@redhat=
.com] On Behalf Of Diego Bello
> Sent: Tuesday, January 19, 2010 7:52 AM
> To: [email protected]
> 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 monitore=
d 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 elegan=
t choice. I need it to be done automatically using scripts, but I can't fin=
d any hint in man pages of lvsd, nanny or ipvsadm.
>
> Thanks.
>
> --
> Diego Bello Carre=F1o
>
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-- =

Diego Bello Carre=F1o