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Crontab do not run on PM hours

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Operating Systems HP-UX Crontab do not run on PM hours
# 36  
Old 04-17-2012
Is that ping spawned by cron? Most unix-pings do not stop unless you tell them by using the -c flag.
# 37  
Old 04-17-2012
No that is cron entry:
Code:
#* 10-11 * * * /usr/sbin/ping 192.168.0.85 | while read pong; do echo "$(date): $pong"; done > /tmp/fr/ping_date.txt

That should not be running because is commented. but it appears in the ps command

Code:
ls -lrt | tail
-rw-r--r--   1 root       sys          19928 Feb  8 16:42 disk.080212
-rw-r--r--   1 root       sys          21058 Feb  8 16:45 present_new_disk.080212
-rw-r--r--   1 root       sys        3044648 Feb 17 08:57 mceldev.170212
-rwx------   1 root       sys          11914 Feb 17 11:09 vconf11
-rwxrwxrwx   1 root       sys            254 Mar 23 10:17 fs
-rwx------   1 root       sys           1398 Apr 16 15:03 netscp
-rw-r--r--   1 root       sys              0 Apr 16 16:00 outfile
-rw-r--r--   1 root       sys              0 Apr 16 16:00 errorfile
-rw-r--r--   1 root       sys        2877696 Apr 17 09:00 downlog
-rw-r--r--   1 root       sys              4 Apr 17 09:00 abc
mceldev[607]/tmp/fr #

# 38  
Old 04-17-2012
That cron alone was enough because it will try to start 119 concurrent jobs (one per minute between 10:00-11:59) .They do look faulty because they all started the day BEFORE you issued the ps -ef.
When you fix the process, note that the HP-UX ping command takes a parameter -n <number> to restrict the number of ping packets.
I can't explain why the ping jobs have PPID 1 unless cron has been stop/started since they started running or they were actually started with nohup command &.


A gash way of finding out what jobs are running directly from cron is to find out the PID of cron itself and then grep that as PPID from ps -ef . This will not tell you what is queued but might help diagnose where the 100 concurrent jobs are coming from (assuming it wasn't the faulty ping cron).
Last edited by methyl; 04-17-2012 at 08:42 AM.. Reason: spelling & layout
# 39  
Old 04-17-2012
Thank you very much for your email, I did not noticed that by running between 10:00-11:00, I was puting so much "stress" in the crontab (running lots of jobs). I did start/stop the cron earlier. Because that entry was already commented out, can I kill those pids with related with ping command?
# 40  
Old 04-17-2012
Yes you can kill the PIDs from the rogue "ping" processes.

Killing these processes may leave crout... files in /var/spool/cron/tmp . Just check that these files are not too big, otherwise they are harmless.



Footnote: Starting and stopping cron is the last resort and you need to be sure that cron is doing nothing at the time. I would only stop cron if I was doing something unusual like working on a database when I did not want any "interruptions".
Last edited by methyl; 04-17-2012 at 08:50 PM..
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