Third Cron Line not Running

[derekwa]

Hello all, I am running Fedora and need to have 3 instances of mrtg run at the same time. I have added the lines to the Crontab for Root (see below) The first two work, but the third does not. I know the commands work because I can switch the lines order and it will work. Does anyone know why this last line wont' work....or a way to combine them?

Thanks,
Derek



# run-tasks
*/5 * * * * env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco2500.cfg --logging /var/log/mrtg.log

*/5 * * * * env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco1710.cfg --logging /var/log/mrtg.log

*/6 * * * * env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco2600.cfg --logging /var/log/mrtg.log

 

[chriseubank]

put the lines in a script and have only one entry?

Are you sure that you're waiting for the 6th minute to check to see if it ran or not? I notice they are /5 /5 and /6

HTH,
C

 

[derekwa]

Chris,
I changed that to a 6 to see if maybe mrtg could not run 3 instances at the same time.


Is there a way to combine these to one?

 

[chriseubank]

yeah, create a shell script EG:

#!/bin/bash
env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco2500.cfg --logging /var/log/mrtg.log &

etc etc...


Then point your cron job at the shell script you just created

HTH!
C

 

[derekwa]

Chris,
Thanks that worked.....however I am having another problem. I am very new to this so, please bear with me. I created a shell script with the info I need to run. I can get it to run by typing "bash /usr/local/mrtg-2/mrtg" What do i need to add to my cron. I added "*/5 * * * * /usr/local/mrtg-2/mrtg"

but it does not work..

 

[SamBones]

When you switch the order of the lines, is it always the third line that doesn't work? If so, you might need a line feed at the end of the line. Also, some crons don't like blank lines in the crontab.

Try this for your crontab...

# run-tasks
*/5 * * * * env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco2500.cfg --logging /var/log/mrtg.log
#
*/5 * * * * env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco1710.cfg --logging /var/log/mrtg.log
#
*/6 * * * * env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/httpd/mrtg/cisco2600.cfg --logging /var/log/mrtg.log
#

Also check to see if [tt]/etc/httpd/mrtg/cisco2600.cfg[/tt] is actually there and is readable (well, if this is run by [tt]root[/tt], this shouldn't be an issue).

Hope this helps.

 

[pcunix]

I created a shell script with the info I need to run. I can get it to run by typing "bash /usr/local/mrtg-2/mrtg" What do i need to add to my cron. I added "*/5 * * * * /usr/local/mrtg-2/mrtg"

Do a "chmod 755 /usr/local/mrtg-2/mrtg" (or even 700 if no one but you needs to run it)

Tony Lawrence
Linux/Unix/Mac OS X Resources

http://aplawrence.com

 

[chriseubank]

Yep.. pcunix, you're most likely right.. permissions on your script need to be executable for world.

Either that or assign a specific group to the executable that "root" belongs to, and chmod 750

C

 

[Trevoke]

make sure your bash script begins with the line
#!/bin/bash

Or whatever the location of bash is for you..
And then do a

chmod +x <bashscript>
That will make the file executable.

Catapultam habeo. Nisi pecuniam omnem mihi dabis, ad caput tuum saxum immane mittam.

 

[pcunix]

While it's good general advice, adding the bash bang line isn't necessary here. SHELL is going to default to /bin/sh, but there's nothing bash specific in his script so that's unimportant. If it were important, you could override SHELL in the crontab.


Tony Lawrence
Linux/Unix/Mac OS X Resources

http://aplawrence.com