support nginx reload.

[beacer]

Nginx reload function doesn't work.

Environment

1. F-stack version: master:afba4e3b
2. CPU: Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz
3. OS: CentOS Linux release 7.2.1511 (Core)
4. Kernel: 3.10.0-327.el7.x86_64

Steps

1. setup f-stack and nginx app, make sure curl works
2. change the nginx configure file /usr/local/nginx_fstack/conf/nginx.conf
   e.g., add new server (listen port), or add a proxy server(upstream)
3. try reload with 'killall -SIGHUP nginx'

consider fstack-nginx is working in "single-process" mode, no master process. So use killall to send signal to all processes.

Expect that new configure applied, actually it does not. Even the curl fails after "reload".

Reproducible

Being able to reproduce.

[whl739]

Nginx reload is not supported for now. Because we didn't implement/hook the fork function, all processes are working in NGX_PROCESS_SINGLE mode.
This will be fixed after we implement/hook fork.

[beacer]

@whl739 just wondering if fork be implemented on the next release (July) or not ? Thanks!

[whl739]

fork will be implemented on the next release (July).

[friendwu]

@whl739 sorry, I don't quite understand, and would you please teach me, why should f-stack implement fork hook?

I'm now porting my project(DNS Authoritative Server) to f-stack, using the master-worker pattern, and... it seems to work well:

After master start running, it calls the "ff_mod_init" and then forks the worker, worker finally calls the "ff_init" and "ff_run", are there any problems which I haven't found?

[whl739]

@friendwu
All I really want to do is what you say, i just want to wrap them in fork.Thus user's code can be changed as little as possible.

[haoyixin]

@whl739 how does this going？thx.

[whl739]

Sorry, recently, i was busy with other works.
This may be delayed for few weeks.

[haoyixin]

@whl739 I attended a sharing of Intel yesterday, and Intel recommend f-stack for us, we want to try it on our lb on mesos cluster. So, really looking forward to this feature and thanks for your quick response.

[haoyixin]

@whl739 how does this going? ＾ᗜ＾

[whl739]

Working now. May be done this week.