Jacob Volstrup wrote:
Hi list,
For quite some time I have tried to debug a script running from a
cronjob but I just cannot find my error.
* The short version *
I have a keytab which is used from my cronscript. The script is executed
every 5 minutes and has a local non-AFS lockfile to prevent multiple
scripts working on data at the same time.
For convenience we call the running script R and the starting/checking
script S. The S script exits if the lockfile exists, if not it
initializes the AFS credentials with kinit and the keytab file and
becomes R. When S exits R will loose its AFS credentials, which is the
part I just do not understand as I would expect that the different
executions of the cronjob have their own running environment.
Ubuntu has a /etc/pam.d/cron file. It calls common-account and
common-session. Do you have any pam routines that could be deleting
the token? It sounds like your job is not run in its own PAG
so it using a shared PAG for the user the job is running under.
Some debug options on the pam routines might show something.
Add some klist and tokens commands to you script might also help.
* The longer version *
I use a local script for initialising the AFS credentials and further
execute a script which resides on AFS:
#!/usr/bin/perl -w
#
# cronscript-initialize.pl
$lockfile = "/home/cdvwww/tmp/cronscript.lck";
$execute_script = "/afs/s-et.aau.dk/scripts/cronscript-execute.pl";
$keytab = "/home/cdvwww/keytab-cdvwww";
createLockfile($lockfile, 36);
initAFS();
system($execute_script);
sub initAFS {
$res_kinit = system("kinit", "-k", "-t", $keytab, "cdvwww");
if ($res_kinit == 0) {
$res_aklog = system("aklog");
if ($res_aklog != 0) {
die("Could not establish credentials (error in aklog)\n");
}
} else {
die("Could not establish credentials (error in kinit)\n");
}
}
# Creates lockfile if it does not exist already
sub createLockfile {
(local $lockfile, local $number) = @_;
if (-e $lockfile) {
open (FILE, $lockfile);
$counter=<FILE>;
close(FILE);
writeCounter($lockfile, ($counter + 1));
if ($counter < $number) {
exit;
} else {
if ($counter % $number == 0) {
die "Lock file " . $lockfile . " exists\n";
} else {
exit;
}
}
} else {
writeCounter($lockfile, 0);
if (!(-e $lockfile)) {
die "Could not create lockfile $lockfile! Aborting.";
}
}
}
sub writeCounter {
(local $filename, local $counter) = @_;
open (WRITE,">$filename");
print WRITE "$counter";
close(WRITE);
}
# EOF
The rest is like explained in the short version. I am pretty sure that
the error resides inside my script but I cannot figure out where it is.
The running system is an AMD-K6 300MHz with Ubuntu 6.06 256MB of ram.
Any help will be appreciated.
Sincerely, Jacob Volstrup
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--
Douglas E. Engert <[EMAIL PROTECTED]>
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
(630) 252-5444
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