php - Check if process is running, if not start it -

i'm using ratchet, node js application , zeromq in codeigniter based php application.

in admin dashboard, want able see if socket running , if node js app running. if it's down, need able put online.

i know can use php's exec putting online, script finish, command line.

how can achieve this? like:

ratchet: status online (stop, start, restart) node service: status online (stop, start, restart) zeromq: status online (stop, start, restart)

i tried lot of solutions including fsockopen() check if port open...

but working solution check if node js application process on argument application file. if not use exec run permanently (with & argument) , putting output in logfile (in same folder of node app).

$node       = '/usr/bin/node'; $base       = '/path/to/your/app'; $appfile    = 'my_app.js'; $logfile    = 'my_app.log'; $proc       = explode("\n", trim(shell_exec(" ps -ef | grep -v grep | grep $appfile"))); if ($proc[0] == '') {     exec("$node $base/$appfile >> $base/$logfile &"); } 

it's working fine , running node server once.

edit : minimalist php code version :

if(trim(shell_exec('ps -ef | grep -v grep | grep app.js')))=='') {     exec('node /path/to/app.js >> /path/to/app.log &'); }