Re: [HTCondor-users] runtime vs persistent attributes

[Mary Romelfanger <mary@xxxxxxxxx>]

Hi Todd, 

Your guess was correct.   Option 2:  I want a node to refuse to run any new jobs after completing a reboot until it is remotely turned on (but I need HTCondor to come up far enough to be able to do that remote turn on).  We could add a step to reset the attribute back to "don't run" as part of any clean shut down procedure, but that does not handle any non-controlled reboot events which do happen occasionally.

Your suggestions below confirmed my suspicions about the behavior of the persistent attributes and the associated files.  I had actually wondered whether removing that file would cause problems. Thank You for confirming that option.  I do think that I can either add a wrapper script to the master start up or add a line to remove the file from the script that starts HTCondor at boot time.  Either option should have the same effect.   

I will try that and I will be back if I have any more questions!

   THANK YOU     

         Mary

ïOn 10/8/19, 4:10 PM, "HTCondor-users on behalf of Todd Tannenbaum" <htcondor-users-bounces@xxxxxxxxxxx on behalf of tannenba@xxxxxxxxxxx> wrote:

    
    On 10/8/2019 1:48 PM, Mary Romelfanger wrote:
    > Hi everyone,
    >
    > I am working on setting an attribute for enabling jobs to run on a
    > startd node, so that the startd will not start jobs at boot time.
    >
    
    Hi Mary,
    
    I am not sure I understand the policy goal you stated above.  Could you help me understand what it is you want to do (without any HTCondor specifics) ?    Do you want to be able to mark nodes as "I want to reboot this node", and have such marked nodes refuse to start new jobs?  Or do you want a node to refuse to run any new jobs after completing a reboot until it is remotely "turned on" ?
    
    I will attempt to answer you detailed questions below, but it would really help me to help you if I better understood what your end goal is...
    
    > I understand that runtime only attributes will not survive a daemon
    > restarting, but that persistent attributes will survive a daemon
    > restarting.
    
    That is correct, assuming you are talking about "condor_config_val -rset" versus "condor_config_val -set"
    
    > It feels like I need something in between or is a restart
    > or system reboot treated as more than just a daemon restart?
    >
    > Does a persistent attribute survive an HTCondor restart (or a system
    > rebooting meaning more than a reconfigure)?
    >
    
    Yes, a persistent attribute (condor_config_val -set) survives an HTCondor restart.
    
    > By reading I would have guessed not, but the existence of a file for
    > persistence implies that that file will be read with an initial start?
    
    Correct.
    
    > If it does read that persistence file at an initial start, is there a
    > way to turn that off so that it does not?  I want the attribute to
    > return back to the default value with a full restart, but I would like
    > the attribute to survive any internal startd restarts (master daemon
    > saves) in between.
    
    Perhaps a wrapper script around condor_master that does something like
    
       #!/bin/bash
       # Remove any persistent setting for startd config knob 'foo'
       # Then start the condor_master
       PERSIST_CONFIG_DIR=`condor_config_val persistent_config_dir 2> /dev/null`
       if (( $? == 0 )); then
            rm $PERSIST_CONFIG_DIR/.config.STARTD/foo
       fi
       exec /usr/sbin/condor_master $*
    
    Warning! The above is off the top of my head... just something to think about, don't
    cut-n-paste the above into production!
    
    Hope the above helps,
    regards
    Todd
    
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