My django app has ben running for about 3 months now.
I often get a 502 Bad Gateway error message on any page, even the Django admin page.
The output from sudo tail -20 /var/log/nginx/error.log yields:
2022/03/29 16:12:56 [error] 720#720: *8182 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /backyard/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/backyard/", host: "104.131.165.99", referrer: "http://104.131.165.99/backyard/"
2022/03/29 16:19:44 [error] 720#720: *8188 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 16:26:29 [error] 720#720: *8194 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 16:36:30 [error] 720#720: *8205 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 16:42:58 [error] 720#720: *8209 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /backyard/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/backyard/", host: "104.131.165.99", referrer: "http://104.131.165.99/backyard/"
2022/03/29 16:49:45 [error] 720#720: *8221 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:09:45 [error] 720#720: *8244 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:12:57 [error] 720#720: *8251 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /backyard/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/backyard/", host: "104.131.165.99", referrer: "http://104.131.165.99/backyard/"
2022/03/29 17:16:54 [error] 720#720: *8255 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:23:04 [error] 720#720: *8261 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:29:44 [error] 720#720: *8265 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:33:10 [error] 720#720: *8269 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:46:25 [error] 720#720: *8282 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 17:49:47 [error] 720#720: *8284 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 18:40:19 [error] 720#720: *8303 upstream prematurely closed connection while reading response header from upstream, client: 73.178.103.149, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99"
2022/03/29 18:44:53 [error] 720#720: *8310 upstream prematurely closed connection while reading response header from upstream, client: 73.178.103.149, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 18:50:50 [error] 720#720: *8320 upstream prematurely closed connection while reading response header from upstream, client: 73.178.103.149, server: _, request: "GET /admin/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/admin/", host: "104.131.165.99"
2022/03/29 18:51:19 [error] 720#720: *8319 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 73.178.103.149, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 18:52:56 [error] 720#720: *8324 upstream prematurely closed connection while reading response header from upstream, client: 73.178.103.149, server: _, request: "GET /garage/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/garage/", host: "104.131.165.99", referrer: "http://104.131.165.99/garage/"
2022/03/29 18:52:56 [error] 720#720: *8327 upstream prematurely closed connection while reading response header from upstream, client: 165.225.38.84, server: _, request: "GET /backyard/ HTTP/1.1", upstream: "http://unix:/home/django/gunicorn.socket:/backyard/", host: "104.131.165.99", referrer: "http://104.131.165.99/backyard/"
and the output from nginx -t is as follows:
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
can someone help me troubleshoot and fix the problem? NOTE I even (occasionally) get this error message even when accessing the django admin page.
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Hi there,
It looks like that your Gunicorn backend is not running, you need to make sure that it is started:
systemctl restart gunicorn.service
For more information on how to troubleshoot common Django and Gunicorn problems I could suggest the following article:
Best,
Bobby
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