A wrapper script for cron to stop multiple process instances starting. Also times out after 12 hours (default) and emails on error.
This is simple python script, put it somewhere in your path.
For system-wide installation (or if you are using a virtual env), you can
use pip install . after cd to this directory. You may wish to first
install pip and the Python package dependencies via your package manager,
and also to create a symlink in /usr/bin where it will be in the PATH
used by cron jobs, e.g.:
yum install python3-pip python3-psutil python3-docopt
pip install .
ln -s /usr/local/bin/crontamer /usr/bin
Usage: crontamer.py [options] 'my_script -opt1 -opt2 arg1 arg2'
Wrapper script for cron jobs enabling locking, timeouts and email of failures. The wrapped commands should be a single quoted string so that any shell expansion and option parsing happens within the wrapped subprocess.
Options: -h, --help show this help message and exit -t HOURS, --timeout=HOURS set timeout for jobs in hours [default: 12.0] -l Sets the process locking so that another instance of this job will not start [default] -u Sets the process locking so that another instance of this job can start -e EMAIL, --email=EMAIL email address to sent to on script fail or timeout -v verbose output set
Examples
$ crontamer
$ crontamer.py -v -t 0.001 'echo START...;sleep 20 ;echo ...END' Make Lock for process 16875 file: /tmp/crontamer.bf3743cba1a799ee03400690ff8b2a38 Starting process for 'echo START...;sleep 20 ;echo ...END' START... Killed on timeout! Process ended Mon Aug 1 11:53:39 2016