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What is the best way to keep a PHP script running as a daemon, and what's the best way to check if needs restarting.
I have some scripts that need to run 24/7 and for the most part I can run them using nohup. But if they go down, what's the best way to monitor it so it can be automatically restarted?
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You can put a task (such as command or script) in a background by appending a & at the end of the command line. The & operator puts command in the background and free up your terminal. The command which runs in background is called a job. You can type other command while background command is running.
A daemon is a Linux program that run in the background, just like a 'Service' on Windows. It can perform all sorts of tasks that do not require direct user input. Apache is a daemon, so is MySQL. All you ever hear from them is found in somewhere in /var/log , yet they silently power over 40% of the Internet.
A daemon is a service process that runs in the background and supervises the system or provides functionality to other processes. Traditionally, daemons are implemented following a scheme originating in SysV Unix.
If you can't use the (proper) init structure to do this (you're on shared hosting, etc.), use cron to run a script (it can be written in whatever language you like) every few minutes that checks to see if they're running, and restarts them if necessary.
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The most elegant solution is reactPHP.
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