How to make friends backend wordpress and node pm2?

Question

Node.js

Good day, colleagues!
There is wordpress, there is node pm2. They work on the same host. I would like to restart a certain task in pm2 when clicking in the wordpress admin panel.
Tried the trail. option:
1. Send ajax request to php part of wp.
2. php, having received this request, tried to execute it like this:
shell_exec('node /home/cron/tempTask.js'); // process is restarted in tempTask.js via require('pm2').
and so:
shell_exec('pm2 start TempTask');
The maximum that was achieved was to receive in response the standard output of pm2:
Community Edition
Production Process Manager for Node.js applications
with a built-in Load Balancer.
Start and Daemonize any application:
$ pm2 start app.js
Load Balance 4 instances of api.js:
$ pm2 start api.js -i 4
Monitor in production:
$ pm2 monitor
Make pm2 auto-boot at server restart:
$ pm2 startup
To go further checkout:
pm2.io
Task in pm2 does not restart.
Any ideas in which direction to dig? Maybe someone has already encountered.

Answer 1

Most likely the problem is that pm2 keeps its own list of tasks for each system user, and you probably run php from a different user from the one under which the necessary pm2 tasks are running.
As a head-on solution, I would suggest rolling out a small service on a node, which will be launched from under the desired user by the same pm2 and will listen to a unix socket (do not forget to give the right to issue a current) or port, and with php just pull it with requests