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

["Kewley, J \(John\)" <j.kewley@xxxxxxxx>]

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>:

        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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