Condor Reconfigure

This pages purpose is to show how to reconfigure a condor pool if the master/server units IP address changes. (Note: This has happened in our case because 1: The server did not have a static IP address. 2:The direct IP address was being used instead of a domain name in condor_config CONDOR_HOST.)

The Condor Master (Fedora RC7 Linux with Gnome)

First a couple quick questions answered.

     1. Condor is located in two main directories
           Actual program scripts

         /usr/local/condor/sbin

           Condor configuration

         /etc/condor

   2. No the condor master does not run auto-magically when you start the system                 
      --well at least not in Linux

Now here is what I had to do:

1. open a terminal window and get the new IP address of the machine

/sbin/./ifconfig 

2. I had to edit the condor_config file to enter in the new IP address (In case you didn't know it the condor_config file is for both the master's config and the workers. (Note: if you are not root, you may have to type su or sudo prior to running this command)

 gedit /etc/condor_config 

change the CONDOR_HOST under Part 1 then save the config. (Note: If you cannot save, you may need to open the file as root by doing su or sudo.)

3. Now you have to start the master. (Note: If you already have the master running you may just be able to type ./condor_reconfigure)

cd /usr/local/condor/sbin
./condor_master

As long as you don't see any errors you should be good to go. 4. Check to make sure the condor is running by typing

condor_status

Assuming all went well you should get something like the following:

[condor@ecsulab222-16 ~]$ condor_status

Name          OpSys       Arch   State      Activity   LoadAv Mem   ActvtyTime

10-24-5-83.my LINUX       INTEL  Unclaimed  Idle       0.000   883  0+02:15:04


                   Total Owner Claimed Unclaimed Matched Preempting Backfill

       INTEL/LINUX     1     0       0         1       0          0        0

             Total     1     0       0         1       0          0        0

Now for the workers

Condor Workers (MAC OS X, Linux, Windows XP)

Mac OS X and Linux (Note: Make sure you still have the IP address of the Condor Master)

1. Open a Terminal window and edit the condor_config file to change the CONDOR_HOST under Part 1 to the IP address of the Master

 open /Users/condor/condor_config 

Then save the file. (Note: If you cannot save, you may need to open the file as root by doing su then running the open command.)

2. You must start the master manually

cd /usr/local/condor/sbin/
./condor_master

3. Now you must force the master to take the reconfiguration

./condor_reconfig

4. After a minute or so as long as you haven't had any errors you can go back to the condor master and do a condor_status to look for the OS X machine.

[condor@ecsulab222-16 ~]$ condor_status

Name          OpSys       Arch   State      Activity   LoadAv Mem   ActvtyTime

10-24-5-83.my LINUX       INTEL  Unclaimed  Idle       0.000   883  0+02:45:04
10-24-5-51.my OSX         PPC    Unclaimed  Idle       0.010   128  0+00:09:49

                   Total Owner Claimed Unclaimed Matched Preempting Backfill

       INTEL/LINUX     1     0       0         1       0          0        0
           PPC/OSX     1     0       0         1       0          0        0

             Total     2     0       0         2       0          0        0

Windows XP

1. Open the c:\condor\condor_config file. (Note: when you double click the icon and it asks what program to open in, I suggest NotePad.)

2. Change the CONDOR_HOST under Part 1 to the IP address of the Master.

3. Save the file. (Note: If you are unable to save, you may need to log in to an account with administrative privileges.)

4. Restart the computer.

5. After a minute or so once the computer has booted, and as long as you haven't had any errors, you can go back to the condor master and do a condor_status to look for the WINNT 51 machine.

[condor@ecsulab222-16 ~]$ condor_status

Name          OpSys       Arch   State      Activity   LoadAv Mem   ActvtyTime

10-24-5-122.m LINUX       INTEL  Unclaimed  Idle       0.480   376[?????]
10-24-5-83.my LINUX       INTEL  Unclaimed  Idle       0.000   883  0+02:45:04
10-24-5-51.my OSX         PPC    Unclaimed  Idle       0.010   128  0+00:09:49
cerser1       WINNT51     INTEL  Unclaimed  Idle       0.000   511  0+00:09:39
cerser2       WINNT51     INTEL  Unclaimed  Idle       0.000   511  0+00:04:38
cerser3       WINNT51     INTEL  Unclaimed  Idle       0.000   511  0+00:04:38
cerser4       WINNT51     INTEL  Unclaimed  Idle       0.000   511  0+00:04:34

                   Total Owner Claimed Unclaimed Matched Preempting Backfill

       INTEL/LINUX     2     0       0         2       0          0        0
     INTEL/WINNT51     4     0       0         4       0          0        0
           PPC/OSX     1     0       0         1       0          0        0

             Total     7     0       0         7       0          0        0