[GE users] Environment leaking

beatrubi beat at 0x1b.ch
Tue Dec 15 11:10:57 GMT 2009


Hello!

I had a quite strange effect in GE6.2u3 on SLES10. During the weekend I
restarted all the execution daemons. After this step the PATH was no longer
set correctly for user jobs.

Doing some debugging I found that the environment of the process starting
/etc/init.d/sgeexecd is passed to the users jobs. As I used ssh to start the
execution daemons I found also some SSH related variables :-)

    beat at master:~> cat envtest.sub
    #!/bin/sh

    #$ -N EnvTest
    #$ -S /bin/sh
    #$ -cwd
    #$ -j y

    set

    beat at master:~> qsub envtest.sub
    Your job 208 ("EnvTest") has been submitted

    beat at master:~> cat EnvTest.o208
    ...
    SSH_CLIENT='10.150.0.1 40038 22'
    SSH_CONNECTION='10.150.0.1 40038 10.150.0.1 22'
    SSH_TTY=/dev/pts/9
    TERM=xterm
    ...
    PROFILEREAD=true

The variable $PROFILEREAD is used by SuSE to avoid a second sourcing of
/etc/profile. It was set by the root shell I used to start the execution
daemon. Passed through the init script, sge_execd and sge_shepherd to the
login shell of the job. And there it avoided a clean setup of the
environment.

In my understanding each program starting user shells should cleanup the
environment. login and ssh does, even the good old in.telnetd does. Why not
sge_shepherd?

To workaround my problem I added a line to my init scripts:

--- sgeexecd.cluster.orig    2009-12-12 10:09:46.383474352 +0100
+++ sgeexecd.cluster    2009-12-15 11:30:44.920153858 +0100
@@ -36,6 +36,10 @@
 #___INFO__MARK_END__
 
 #
+# Delete environment - sge_execd and sge_shepherd are leaking
+unset `env | awk -F= '{ print $1 }'`
+
+#
 # This script can be called with the following arguments:
 #
 #       start       start execution daemon

Beat

-- 
     \|/                           Beat Rubischon <beat at 0x1b.ch>
   ( 0^0 )                             http://www.0x1b.ch/~beat/
oOO--(_)--OOo---------------------------------------------------
Meine Erlebnisse, Gedanken und Traeume: http://www.0x1b.ch/blog/

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