How to stop a command running in the background using an ampersand?

Question

linux

The server has continuous integration. And when pushing to git, CI executes commands.
One of them is php bin/console sockets:start &.
&I use it to run in the background.
And on a new push to git, this command is run a second time.
How to stop the previous one so that only the last one works in the background?

Answer 1

Kill the previous process with kill
It is prudent to create a .pid file with the process number in your php immediately after startup, so that you can track whether the process is running on it.
In general, this is the task of any configuration engineer junior

Answer 2

You can use fg to call a background task on the terminal.
You can shoot with kill if pid is remembered somewhere

Answer 3

tldp.org/LDP/abs/html/x9644.html
The fg command switches a job running in the background into the foreground. The bg command restarts a suspended job, and runs it in the background. If no job number is specified, then the fg or bg command acts upon the currently running job.
or
ps-aux | grep php
kill -15 process number
kill -9 process number