Re: [uWSGI] process created in UWSGI does not finish in threaded mode
On 25-09-2018 17:01, Roberto De Ioris wrote:
I am using CentOS 7 with uwsgi(2.0.17.1), uwsgi-plugin-python2 (2.0.17)
and Flask (1.0.2).
I have a flask application that runs many shell commands. Some of them
hangs indefinitely. I am sharing one of them as an example below, it is
easy to reproduce.
I am using uwsgi in threaded mode.
* #!/usr/bin/python**
** from flask import Flask**
** import subprocess**
** app = Flask(__name__)**
** @app.route("/test/")**
** def test():**
** print 'state 1'**
** p = subprocess.Popen(['ntpdate', '-u',
'0.pool.ntp.org'],close_fds=True)**
** print 'state 2'**
** out, err = p.communicate()**
** print 'state 3'**
** print 'output: {}'.format(out)**
** print 'error: {}'.format(err)**
** return 'finish'*
uwsgi command:
*> \# uwsgi --ini uwsgi.conf --http-socket :8001*
uwsgi conf file:
* [uwsgi]**
** #virtual env's base folder**
** base = /root/plaground**
** home = /usr/**
** #cmd options**
** bin = /usr/sbin/uwsgi**
** #python module to import**
** module = app:app**
** pythonpath = /root/playground**
** catch-exceptions = true**
** plugins-dir = /usr/lib64/uwsgi/**
** plugins = python**
** need-app = true**
** master = true**
** threads = 10*
After starting uwsgi, first request to /test route completes
succesfully, Second one stucking on command line execution and holds
response forever.
The first call output:
*state 1**
** state 2**
** 21 Sep 16:02:48 ntpdate[19943]: adjust time server 78.46.53.11
offset -0.000224 sec**
** state 3**
** output: None**
** error: None*
The second call output:
*state 1**
** state 2*
Hi, from the strace output it looks like the spawned process is blocked
waiting for network data. Are you sure you do not have something like
selinux (or at firewall level) that is blocking traffic ?
Hello, yes I disabled selinux and firewall before testing. As I said
above I can successfully get response when I run my application on flask
built-in server or simply running command on command line.
___
uWSGI mailing list
uWSGI@lists.unbit.it
http://lists.unbit.it/cgi-bin/mailman/listinfo/uwsgi
Re: [uWSGI] process created in UWSGI does not finish in threaded mode
> I am using CentOS 7 with uwsgi(2.0.17.1), uwsgi-plugin-python2 (2.0.17)
> and Flask (1.0.2).
>
> I have a flask application that runs many shell commands. Some of them
> hangs indefinitely. I am sharing one of them as an example below, it is
> easy to reproduce.
> I am using uwsgi in threaded mode.
>
> * #!/usr/bin/python**
> ** from flask import Flask**
> ** import subprocess**
>
> ** app = Flask(__name__)**
>
> ** @app.route("/test/")**
> ** def test():**
> ** print 'state 1'**
> ** p = subprocess.Popen(['ntpdate', '-u',
> '0.pool.ntp.org'],close_fds=True)**
> ** print 'state 2'**
> ** out, err = p.communicate()**
> ** print 'state 3'**
>
> ** print 'output: {}'.format(out)**
> ** print 'error: {}'.format(err)**
> ** return 'finish'*
>
> uwsgi command:
>
> *> \# uwsgi --ini uwsgi.conf --http-socket :8001*
>
> uwsgi conf file:
>
> * [uwsgi]**
> ** #virtual env's base folder**
> ** base = /root/plaground**
> ** home = /usr/**
>
> ** #cmd options**
> ** bin = /usr/sbin/uwsgi**
>
> ** #python module to import**
> ** module = app:app**
>
> ** pythonpath = /root/playground**
>
> ** catch-exceptions = true**
>
> ** plugins-dir = /usr/lib64/uwsgi/**
> ** plugins = python**
>
> ** need-app = true**
>
> ** master = true**
> ** threads = 10*
>
> After starting uwsgi, first request to /test route completes
> succesfully, Second one stucking on command line execution and holds
> response forever.
>
> The first call output:
>
> *state 1**
> ** state 2**
> ** 21 Sep 16:02:48 ntpdate[19943]: adjust time server 78.46.53.11
> offset -0.000224 sec**
> ** state 3**
> ** output: None**
> ** error: None*
>
> The second call output:
>
> *state 1**
> ** state 2*
>
>
Hi, from the strace output it looks like the spawned process is blocked
waiting for network data. Are you sure you do not have something like
selinux (or at firewall level) that is blocking traffic ?
--
Roberto De Ioris
http://unbit.com
___
uWSGI mailing list
uWSGI@lists.unbit.it
http://lists.unbit.it/cgi-bin/mailman/listinfo/uwsgi
