Hi, we are using uWSGI in emperor mode on AWS and we recently encountered a bad case of EBS drive degradation that forced us to restart uWSGI once the hard drive was working correctly again. My main question is: is there any configuration option that would have allowed us to automatically restart uWSGI.
The details: 1. We use uWSGI 2.0.17 in emperor mode and nginx is used as a reverse proxy. 2. Our main application has the following configuration: ``` [uwsgi] socket = 127.0.0.1:8999 pythonpath = /path/to/app virtualenv = /path/to/virtualenv processes = 6 max-requests = 100 reload-on-rss = 100 master = true harakiri = 20 module = our_app.wsgi pidfile = /var/run/webapp/our_app.pid post-buffering = 4096 logger = syslog:uwsgi.our_app disable-logging = true log-date = true log-slow = 1000 log-5xx = true log-maxsize = 16777216 ``` 3. When the EBS drive started behaving erratically, we started receiving hundreds of harakiri notifications: `Sep 25 20:10:15 our_server uwsgi.our_app: Tue Sep 25 20:05:37 2018 - *** HARAKIRI ON WORKER 1 (pid: 3720, try: 382) **` 4. Then we started to see this log statement: `Sep 25 20:13:35 our_server uwsgi.our_app: Tue Sep 25 20:08:57 2018 - *** uWSGI listen queue of socket "127.0.0.1:8999" (fd: 6) full !!! (101/100) ***` 5. Once the hard drive recovered, new requests were still returning 504 gateway timeout error for several minutes. Restarting uWSGI "fixed" the problem. My uninformed guess is that uWSGI was still trying to process the listen queue, but I wonder if there is some configuration parameter or some statistics emitted by uWSGI that we could use to automate a restart if this ever happens again. In any case, thanks for this wonderful piece of software! -- *Barthélémy Dagenais* Chef de la technologie | Chief Technology Officer t. 1 (877) 672-2844 x202 m. (438) 324-0860 Resulto.ca <http://www.resulto.ca> · Linkedin <https://www.linkedin.com/company/resulto>
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