Expose ”Address already in use“ when start the service

[jude-zhu]

when start the service using "nebula.service", it says done. However, when I check the log, "Address already in use"

[dutor]

I don't think it's necessary to make nebula.service start do what nebula.service status does. The daemons work in a kind of async way, that says launch a process, do some simple sanity checks, fork a child process then exit(sucessfuly). The actual service runs in the child process.

So, the nebula.service script cannot tell if the child process was properly launched.

FYI. You could refer to the way how systemctl works.

[jude-zhu]

relate to #1304