Hi Marian & Tommaso,
DNS caching does not exist in xrootd until 4.0.0 and later. We added that
because people were running into DNS issues when a lot of worker machines
would all of a sudden connect at the same time. While using the nodnr option
would completely avoid the DNS; some sites were annoyed that it leaves the
log with nothing but IP addresses. Anyway, the default is 3 hours but you
can set it to whatever you want (see xrd.network cache)....
http://xrootd.org/doc/dev4/xrd_config.htm#_Toc383723505
As for automatically restarting everything, no we don't have such a feature
because it isn't fully predictable in that a node might not be reachable via
the cms network at the time you want to do the restart. We normally suggest
using a simple ssh script to launch a restart on all the nodes -- beats
having to log into a lot of servers.
Andy
-----Original Message-----
From: Marian Zvada
Sent: Tuesday, July 29, 2014 12:00 PM
To: Tommaso Boccali ; [log in to unmask]
Subject: Re: a way to remotely force restart?
Hi,
On 7/21/14, 3:05 AM, Tommaso Boccali wrote:
> Ciao,
> we are in the situation where we would like to add another redirector to
> the DNS-RR setup (so a third one under the same DNS entry). If I
> understand correctly, everyone (servers or local cmsd) using the DNS-RR
> would need to be restarted, since they resolve hostname -> IPs at the
> start. This is quite painful, clearly.
> I was wondering if there is a way for a manager to say to all the
> daemons attached to it "please restart/reload/re-resolve the IP",
> instead of going and asking >40 servers to restart ....
well, if sites have local redirector in front of servers it'll reduce
effort significantly... it brings also much more pluses if many servers
at a site.
Question to xrootd-dev folks: Does it cache the DNS entries for a long
time? How long actually?
Thanks,
Marian
> thanks a lot
>
> tom
>
> --
> Tommaso Boccali
> INFN Pisa
>
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