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Old 03-28-2009, 01:32 AM   #1
maxy7710
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Unhappy cron not working


hi

my cron script is in /root/Scripts/NTP

vim /root/Scripts/NTP
ntpdate 172.17.124.15 >> /root/Scripts/ntp.log
----------------------------------------------------
crontab entries
*/2 * * * * sh /root/Scripts/NTP
----------------------------------------------------
tailf /var/log/cron | grep NTP
Mar 28 11:52:01 CPCAPP101 crond[9427]: (root) CMD (sh /root/Scripts/NTP)
Mar 28 11:54:01 CPCAPP101 crond[9442]: (root) CMD (sh /root/Scripts/NTP)
----------------------------------------------------

when i run the script as "sh /root/Scripts/NTP" then it runs perfectly
but in cron it some how doesn't work. "tailf /var/log/cron | grep NTP" shows cron job is been executed but in " /root/Scripts/ntp.log" i don't see the logs but when i run the script separately i get logs in "/root/Scripts/ntp.log"

Script is perfect & other cron jobs are working fine.
Only this particular script is giving problem.
 
Old 03-28-2009, 01:49 AM   #2
jdkaye
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The only thing that comes to mind is permissions. cron is a bit fussy about what the exact permissions are. I've been bitten by this problem where something will run manually as a script but won't run in a cron context. Have you checked to make sure that NTP has the same permissions as the other scripts that do run successfully in cron have?
cheers,
jdk
 
Old 03-28-2009, 01:51 AM   #3
maxy7710
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hi

this are the permissions & they are same

-rwxr-xr-x 1 root root 933 Mar 5 16:23 Graph
-rwxr-xr-x 1 root root 904 Mar 2 17:11 IO_Graph
-rwxr-xr-x 1 root root 292 Mar 2 17:12 Mem
-rwxr-xr-x 1 root root 94 Mar 28 10:57 NTP
-rwxr-xr-x 1 root root 756 Mar 28 12:12 ntp.log
 
Old 03-28-2009, 02:14 AM   #4
jdkaye
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Hi Maxy,
Hmmmmm. I just solved a problem with a script that I put in /etc/cron.hour. Since my isp changes the ip of the router regularly and I hate laptops I need to use ssh to access my system whenever I travel. So I needed a way of checking regularly to see if my routers ip had changed recently and if so then run a ddclient script to update my dynamic dns site. Just like your case, it didn't work from cron but if I ran the script manually it would work. Then I RTFM-ed the cron man page and found my script, called whatismyip.sh contained a full-stop (".") in the file name which is not allowed by cron. I removed the full-stop and now the script runs perfectly every hour and only runs the ddclient script when my router's ip has actually changed.

All this to say, your log file has a full-stop in the filename. It seems that should be ok but what if you changed the file name to ntp_log just to make sure that is not the problem.
cheers,
jdk

Last edited by jdkaye; 03-28-2009 at 02:16 AM.
 
Old 03-28-2009, 05:12 AM   #5
repo
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try
Code:
/usr/sbin/ntpdate 172.17.124.15 >> /root/Scripts/ntp.log
Cron needs the whole path.
 
  


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