Re: Setting IPVS/LVS timeout in Keepalived

On Thu, Dec 12, 2013 at 09:28:25AM -0500, Paul Robert Marino wrote:
> On Red Hat I would put that in /etc/sysconfig/keepalived even though
> thats a kludge as well its at least a little cleaner.

Can you explain how this would work?

> On Thu, Dec 12, 2013 at 6:25 AM, Ville Törhönen <[email protected]> wrote:
> > Hello.
> >
> > Is it possible to configure IPVS/LVS timeout values in the Keepalived
> > configuration file? By default the TCP timeout values in the kernel LVS
> > tables are as follows:
> >
> > - TCP sessions: 900 seconds
> > - TCP sessions after receiving a FIN packet: 120 seconds
> > - UDP packets: 300 seconds
> >
> > These values can be modified via 'ipsetadm --set', for e.g.
> >
> > $ ipvsadm --set 3600 120 300
> >
> > As expected, these modifications are not persistent and they are lost
> > after system restart. If the current LVS configuration is printed out
> > with 'ipsetadm-save -n', the timeout values aren't included. This makes
> > it impossible to reload the timeout values with the ipvsadm init script.

Right, but as I am sure you know keepalived does not care about the
ipvsadm init script. We had this same issue in Piranha a while back
and I ended up adding the timeouts as options in the config file.

> > This has been discussed several times in the lvs-users mailing list. It
> > has always come to a conclusion that LVS/IPVS is a framework and that
> > the management application should do the configuring. I know that there
> > are other ways to implement this, such as setting the timeout value in
> > /etc/rc.local, but it's obviously a nasty kludge.

I'd be happy to add this to keepalived, but I'd like some ideas on
where these options would be place in the config file. The real_server
blocks and the primary means to configure ipvs related in keepalived,
but these timeouts are not set on a per real server basis. I'd suggest
we either add a new top-level config keyword or set them in
global_defs.

Opinions?

Ryan
 

> > Thanks,
> > Ville
> >
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