启动时的PHP循环脚本不会启动

Question

I have a PHP script that I want to run forever; from starting up server until shutdown.

PHP script

<?php
require_once("connection.php"); // I am connecting to MySQL with PDO

while(true) {
//some of my code here
....
....
//code ended
sleep(5);
}
?>

My /etc/init/myscript.conf file

description "Endless PHP loop"
start on startup
stop on shutdown
respawn
chdir /var/www/html/
exec php -f script.php

I also had try

script
exec php -f script.php
end script

When I run: start myscript from terminal script is running without any problem but if server is rebooted myscript wont run again. Also sometimes script is stop running (I don't know why) and wont start running again.

I am googling for two days and I did not find solution. Maybe I do not know what to look after.

Could it be that script fails because apache, mysql or php startin up? Is there option to delay script 30 sec after startup?

Answer 1

Try changing your upstart script to:

description "Endless PHP loop"

start on startup
stop on shutdown

respawn

script
    sleep 30
    exec php -f /var/www/html/script.php
end script

If you wanted to it with cron you need to remove the endless loop from PHP and add these cron entries:

* * * * * /usr/bin/php -f /var/www/html/script.php &> /dev/null
* * * * * (sleep 5;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 10;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 15;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 20;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 25;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 30;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 35;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 40;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 45;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 50;/usr/bin/php -f /var/www/html/script.php &> /dev/null)
* * * * * (sleep 55;/usr/bin/php -f /var/www/html/script.php &> /dev/null)