Re: [webmin-l] webmin cluster updates/hanging rpc.cgi

[Jamie C. <jca...@we...>]

On 5/Oct/2006 10:13 Pat Erler wrote ..
> hi,
> 
> On Tue, 03 Oct 2006 20:03:10 +0200, Jamie Cameron <jca...@we...>
> wrote:
> >> while celebrating my 365th day of uptime ;) i found a lot of
> >> hanging/waiting rpc.cgi processes from webmin versions removed long,
> >> long
> >> time ago (ie:
> >>
> >> # ps ax|grep rpc
> >> 18103 ?        S      0:00 /usr/local/webmin-1.270/rpc.cgi
> >>
> >> when 1.300 is installed. maybe you should kill them when upgrading.
> >
> > That is odd - the upgrade does indeed kill all processes for the old
> > version. Do you see any from versions newew than 1.270?
> yes, i saw, processes from each version up to 1.300 - and they were a lot,
> around 10-20 per version i think (but i killed them meanwhile)

That is quite odd, as those processes have a timeout that is supposed to
kill them after a few minutes of inactivity. Next time you see one, run the
command :

strace -p $pid

and email me the output.

> >> which reminds me, it is quite hard to cluster-update webmin, because
> you
> >> limit this functionality to servers which are interconnected with the
> >> "fast rpc mode" which seems to be in the end nothing more, as that i
> >> need
> >> to keep up some ports above 10000. now, i'm in the situation, that i
> >> cannot open more than some 20 ports in the hardware firewall my provider
> >> offers me and stupidely - i canot open ranges, so i cannot connect my
> >> webmin servers "fast" in the webmin sense although the speed between
> >> them
> >> is 100mbit. couldn't you make this limitation optional?
> >
> > Sadly no .. only in fast mode can there be a persistent connection from
> > the master to the slave, which is needed for the upgrade.
> ok, as i see you send the update package from the master to the slave -
> couldn't you create another update mode in which each clustered server
> would get the signal "update now" as i do it now by hand?

I guess it might be possible if each server downloads the updated tar.gz or RPM
package itself, or reads it off an NFS shard that all servers have mounted.

Do you usually have each Webmin server do an independent download?

 - Jamie