Re: [Condor-users] Problem with match: sending small msg failed

[Dan Bradley <dan@xxxxxxxxxxxx>]

In the latest version of Condor, about to be released as 6.9.5, it 
should be possible to run Condor completely without using UDP.

The specific problem you are having in the negotiator can be bypassed in 
6.9.5 like this:

NEGOTIATOR_INFORM_STARTD = False

That disables the UDP message from the negotiator to the startd.

As John mentioned, in current versions of Condor, you can also have your 
daemons advertise themselves to the collector using TCP instead of UDP.  
You may not have a problem with that, since, presumably, you already 
have your daemons successfully advertising themselves to the collector.

Other places where UDP can be bypassed in 6.9.5:

SCHEDD_SEND_VACATE_VIA_TCP = true
STARTD_SENDS_ALIVES = true

--Dan

Kewley, J (John) wrote:
> You can tell condor to use tcp for its updates
> http://www.cs.wisc.edu/condor/manual/v6.9/3_7Networking.html#sec:tcp-collector-update
> but that is between nodes and central manager, these comms are direct 
> between
> scheduler and execute machines, so I don't think that would help.
>  
> Section 2.4 of the document
> http://epubs.cclrc.ac.uk/bitstream/919/431.pdf
> describes the use of udp and tcp in detail. Two important things to 
> note is that
> it shows a table where Submit initiates udp to Execute, but not vice 
> versa. It
> also mentions that not all the udp traffic can be turned into tcp.
>  
> Cheers
>  
> JK
>  
>
>     ------------------------------------------------------------------------
>     *From:* condor-users-bounces@xxxxxxxxxxx
>     [mailto:condor-users-bounces@xxxxxxxxxxx] *On Behalf Of *Enol
>     Fernández
>     *Sent:* Thursday, November 22, 2007 6:28 PM
>     *To:* Condor-Users Mail List
>     *Subject:* Re: [Condor-users] Problem with match: sending small
>     msg failed
>
>     OK, so maybe it's a firewall problem because udp ports are not
>     being open, but I don't have enough permission to open them. Is it
>     possible to use only tcp?
>
>     Enol.
>
>     2007/11/22, Kewley, J (John) <j.kewley@xxxxxxxx
>     <mailto:j.kewley@xxxxxxxx>>:
>
>                 It seems it's  between the range
>                 $ condor_config_val LOWPORT
>                 20000
>                 $ condor_config_val HIGHPORT
>                 25000
>
>         OK, that is good, and since they presumably share the same
>         files since
>         the same machine,
>         that should be OK.
>
>                 I have just 1 startd with two virtual machines but I
>         have an
>         startd expression to make my job run only on one of them,
>         that's why it
>         does match vm2 but not vm1
>
>         OK, good plan!
>
>                 I also have a firewall in schedd machine, but it is
>         also open at
>         20000:25000 range.
>
>         Can you check your firewall settings, you need to have it open
>         for udp
>         and well as tcp,
>         it might be that, although I doubt this is causing this problem.
>
>         You can do some simple checks on the ports in each direction
>         as follows:
>
>         [on startd machine]
>         telnet <schedd machine> 20001
>         and
>         telnet <schedd machine> 19999
>
>         and also:
>
>         [on schedd machine]
>         telnet <startd machine> 20001
>         and
>         telnet <startd machine> 19999
>
>         but that will only test tcp, not udp ports being open
>
>         Of course, it might not be anything at all to do with firewalls.
>         But it usually is ... :)
>
>         GL
>
>         Cheers
>
>         JK
>
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>      
>
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