Re: Piranha

Bonjour Sébastien,

Je reviens à un vieux mail.

Sébastien Bonnet a écrit :

> > Hi Mustapha,
>
> > We would like to change the wlc scheduling algorithm to take
> > into account, CPU loads, memory usages, and network load of the
> > real servers.
>
> OK.
>
> > The approach is to periodically cheek these parameters, and
> > update the weight assigned to each real server, according to a
> > given function.
>
> So, your problem/question is not about a scheduler but more likely about
> the monitoring tools. LVS by itself does *never* change RS weights. It
> *can* be the monitoring tools' job.
>
> > A first such approach has been made by Jeremy Kerr, that take
> > into account CPU loads, in LVS.
>
> Yes, I know. What I've understood from what he said is that is
> developping a framework that will help anybody easily plug his own
> program do monitor as wanted.
>
> > Yes,  I have to include monitoring tools in the Piranha software.
> > This is why I am looking to the source files in order to have a
> > global comprehensive view of the software.
>
> OK, now it sounds clear :)
>
> > So, could you please be more accurate ?. In particular, about the
> > relation between the different components of the software.
>
> OK, I'll give it a try. When pulse is started, it tries and sees if
> another pulse is running on the other box. If not, it then starts lvs,
> which then starts one nanny for each RS.
>
> By the same time, lvs adds all active virtual servers (not RS) to IPVS.
>
> Nanny polls a real server and add it to (remove it from) IPVS, and
> regularly adjusts its weight based on CPU load.
>
> This is where you should hack (see getRemoteLoad in nanny.c). Usually,
> the load command is uptime, rup or ruptime, but you can specify whatever
> you want as long as the output is similar to what uptime provides.
>
> The function takes the load as : load average.*:.*(\d\.)+[, ] (if you
> are fluent with regular expressions)
>
> If your remoteload "pluggin" does not produce this, you'll have to
> chance the way getRemoteLoad looks for the load.
>
> If you're willing to code that, I'd propose you use regular expression
> patterns along the remoteload command, which would greatly improve the
> ability to use almost any load reporting program.

Là, je n'ai pas trés bien compris comment les expressions régulières sont
utilisées
dans nanny. Peux-tu stp être un peu plus explicite.

Merci d'avance,
Mustapha