Zero-Downtime Servicing of a Varnish Server Behind a F5 BIG-IP

[Steven Engelhardt]

Just to be clear, would you suggest something like:
1. Mark the Varnish server as disabled in the BIG-IP
2. Use varnishadm to set sess_timeout to 0 to start aggressively closing
HTTP requests?
3. Wait for connections to drain

Steve

On Mon, Jul 9, 2012 at 3:59 PM, Javier Casares <javier at casares.org> wrote:

> https://www.varnish-cache.org/docs/3.0/reference/varnishd.html
>
> sess_timeout
>
>         Units: seconds
>         Default: 5
>
>     Idle timeout for persistent sessions. If a HTTP request has not
> been received in this many seconds, the session is closed.
>
> ¿?
>
> Javier Casares
> http://javiercasares.com/
>
>
> 2012/7/9 Steven Engelhardt <sengelha at gmail.com>:
> > I have two Varnish servers behind a F5 BIG-IP load balancer.  Both
> servers
> > are constantly active and serving ~5,000 requests/second 24x7.  Clients
> > aggressively use HTTP 1.1 Keep-Alives.
> >
> > I'm looking to develop a process for servicing and upgrading the Varnish
> > servers which results in 0 downtime to the client.  Our normal process
> for
> > performing changes on production servers is:
> > 1. Mark the server as disabled in the BIG-IP
> > 2. Wait for the connections on the server to drop to 0
> > 3. Service the machine
> >
> > However, because of the aggressive and constant use of HTTP Keep-Alives,
> > clients virtually never drop their connections, and the machine
> continues to
> > serve traffic for quite a long time after it is disabled in the BIG-IP.
> >
> > Is there a way to tell Varnish to aggressively close all client HTTP
> > connections?
> >
> > Thank you,
> > Steve
> >
> > --
> > Steven Engelhardt
> > sengelha at gmail.com
> >
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> > varnish-misc at varnish-cache.org
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>
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-- 
Steven Engelhardt
sengelha at gmail.com
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