On 10/02/2013 08:10 AM, Ranjan Maitra issued this missive:
Hi,
I have a cron job running which yum updates all my machines once a day.
All of these work fine.
I also have a cron job which checks for kernel updates every hour and
sends me a message if an updated kernel has been installed. Here is the
relevant script:
--- begin file called check-kernel.sh in my scripts/yum directory---
#!/bin/bash
latestkernel=$(rpm -q kernel |tail -n1|sed -e 's/kernel-//')
#echo "$latestkernel"
if uname -a | grep -qv "$latestkernel"; then
notify-send "Kernel UPDATE on ${HOSTNAME}: Running Kernel is $(uname
-r) but lat est installed rpm is ${latestkernel}; REBOOT required"
fi;
--- end file called check-kernel.sh ---
(A bit wordy, I know.)
I have verified that this is executable and works from the commandline
without any errors.
I have the following set up via crontab -e:
0,15,30,45 * * * * nice -n 19 $HOME/.xplanet/download_xplanet_cloudmap
5 * * * * nice -n 19 $HOME/scripts/yum/check-kernel.sh
The first line downloads cloudmaps for use with xplanet and works just
fine (or appears to) and has done so for aeons.
However, nothing happens (or appears to) for the second line.
What is wrong here?
The most common problem I've seen is that cron jobs typically have very
limited paths and the executables you're running (notify-send, uname)
may not be in the path the cronjob has. For giggles, do "echo $PATH" as
the user the cronjob will run as. Then build a cron job that echos
cron's concept of the path:
#!/bin/bash
echo $PATH >/tmp/pathecho.txt
and have cron run that once as the same user. Look at the data in
/tmp/pathecho.txt and I'll bet you'll find its far more restricted than
that of an interactive shell. To fix it, put in a
PATH="data from the echo $PATH command"
right after the "#!/bin/bash" line in your cron job. Since most of
your commands are in /bin, you could do:
PATH=$PATH:/bin
and that would probably suffice (just making sure /bin is in the cron's
path).
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
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- Grabel's Law: 2 is not equal to 3--not even for large values of 2. -
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