There is no switch to enable the debug mode in the check_mk_agent for Linux permanently.
LAST TESTED ON CHECKMK 2.1.0P1
The problem is that the output must be written to a file. Sending it to the CMK Server would lead to a CRIT "Check_MK" service.
Enabling the Debug Mode
To write the debug output to a file on one monitored host, you have to do the following:
1. Create a backup of your check_mk_agent script
root@mylinuxhost:~# cp /usr/bin/check_mk_agent /usr/bin/check_mk_agent.bak
2. Edit the script and add the following lines in the main_setup() routine, after the line set_up_process_commandline_arguments "$@":
/usr/bin/check_mk_agent
#############################################
# Permamently enable debug mode
# log rotation
logfile=/var/log/agent.out
max_logs=10 # Adjust the maximum number of stored log files to your needs.
i=$max_logs
while [ $i -gt 1 ]; do
((j=i-1))
if [ -f $logfile.$j ]; then
mv $logfile.$j $logfile.$i
fi
i=$j
done
if [ -f $logfile ]; then
mv $logfile $logfile.1
fi
# write stderr to log
set -xv
exec 2>$logfile
# Enabling debug END
#############################################
Disabling the Debug Mode
To disable the debug mode, copy your original script:
root@mylinuxhost:~# cp /usr/bin/check_mk_agent.bak /usr/bin/check_mk_agent
Limitations
When you're using the Automatic Agent Updater, it might happen that your modified script will be overwritten.
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