bug: make stop can't kill multi apisix server

[nerowangtc]

Issue description

If I use make run to start multiple apisix server, the process shows below:
[nero@VM_42_81_centos ~/incubator-apisix]$ ps -ef | grep apisix
nero 28293 1 0 10:35 ? 00:00:00 nginx: master process /usr/local/openresty/bin/openresty -p /home/nero/incubator-apisix/ -c /home/nero/incubator-apisix/conf/nginx.conf
nero 29053 1 0 10:40 ? 00:00:00 nginx: master process /usr/local/openresty/bin/openresty -p /home/nero/incubator-apisix/ -c /home/nero/incubator-apisix/conf/nginx.conf

Now if i use make stop to stop a apisxi server , it goes ok
[nero@VM_42_81_centos ~/incubator-apisix]$ make stop
/usr/local/openresty/bin/openresty -p $PWD/ -c $PWD/conf/nginx.conf -s stop
[nero@VM_42_81_centos ~/incubator-apisix]$ ps -ef | grep apisix
nero 28293 1 0 10:35 ? 00:00:00 nginx: master process /usr/local/openresty/bin/openresty -p /home/nero/incubator-apisix/ -c /home/nero/incubator-apisix/conf/nginx.conf
nero 29362 28108 0 10:42 pts/0 00:00:00 grep --color=auto apisix

But if is make stop again, it produce a error message
[nero@VM_42_81_centos ~/incubator-apisix]$ make stop
/usr/local/openresty/bin/openresty -p $PWD/ -c $PWD/conf/nginx.conf -s stop
nginx: [error] open() "/home/nero/incubator-apisix/logs/nginx.pid" failed (2: No such file or directory)
make: *** [stop] Error 1
[nero@VM_42_81_centos ~/incubator-apisix]$ ps -ef | grep apisix
nero 28293 1 0 10:35 ? 00:00:00 nginx: master process /usr/local/openresty/bin/openresty -p /home/nero/incubator-apisix/ -c /home/nero/incubator-apisix/conf/nginx.conf
nero 29421 28108 0 10:42 pts/0 00:00:00 grep --color=auto apisix

and the another apisix process remains
I think this is a bug if some one missuse this command

Environment

• apisix version (cmd: apisix version):
• OS:

Minimal test code / Steps to reproduce the issue

1. make run
2. make run
3. make stop

What's the actual result? (including assertion message & call stack if applicable)

What's the expected result?

[Miss-you]

Hi, the logic for 'make stop' is based on the 'nginx.pid' file. openresty processes, rather than stopping all openresty processes, so the 'make stop' stops only a group of openresty processes

[Miss-you]

On the other hand, I think the root cause of the problem is that multiple 'make run' or 'apisix start' will start multiple groups of apisix processes

[Miss-you]

I think the point we should be discussing is whether multiple 'apisix starts' should only start a set of apisix processes

[nerowangtc]

In my point of view, i think in the current stage of apisix, it is meaningless to start multiple apisix server with make run command, cuz only can access one at a time

[moonming]

@nerowangtc is this issue same as #1663?

[nerowangtc]

@moonming It'looks like the same

[moonming]

@nerowangtc got it, it's a bug when enabled reuseport, welcome PR

[membphis]

only one APISIX instance can be started now.

[membphis]

fixed