Indeed, the use of PID files alone is racy for what is a glorified script (though programmatic here) that simply creates and removes a lock file. Using the cmdl

Indeed, the use of PID files alone is racy for what is a glorified script (though programmatic here) that simply creates and removes a lock file. Using the cmdline as an identifier would be more reliable. Though then you can run into multiple instances, so UUID+cmdline might help?