Gunicorn with Nginx

[miguelgfierro]

Gunicorn with Nginx

[miguelgfierro]

When following this tutorial, after doing sudo nginx -t I get the following error:

nginx: [emerg] could not build server_names_hash, you should increase server_names_hash_bucket_size: 64
nginx: configuration file /etc/nginx/nginx.conf test failed

Then I go to sudo vim /etc/nginx/nginx.conf and uncomment the line: server_names_hash_bucket_size: 64, however, I get the exact same error.

If I change it to 128, then the service is ok:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

The reason was because my domain name is very long and server_names_hash_bucket_size controls the maximum length of a virtual host entry (ie the length of the domain name).

[miguelgfierro]

After opening the port 80 and put http://my-dns.com:80, I get a bad gateway: 502 Bad Gateway.

[miguelgfierro]

I am following the guide for Ubuntu 16.04. I got Bad gateway.
After restarting the service:

sudo systemctl restart cntk_api
sudo systemctl restart nginx

I got the following error:

2017/03/21 07:44:27 [crit] 30615#30615: *1 connect() to unix:/home/hoaphumanoid/repo/sciblog_support/Intro_to_Machine_Learning_API/cntk_api.sock failed (13: Permission denied) while connecting to upstream, client: ...

To solve it: chmod 777 cntk_api.sock. Then I got the following:

2017/03/21 07:46:12 [error] 30724#30724: *1 connect() to unix:/home/hoaphumanoid/repo/sciblog_support/Intro_to_Machine_Learning_API/cntk_api.sock failed (111: Connection refused) while connecting to upstream, client: ...

If I do sudo journalctl -u cntk_api I get:

Mar 21 07:51:44 hoaphumanoidserver systemd[1]: Stopped Gunicorn instance to serve CNTK API.
Mar 21 07:51:44 hoaphumanoidserver systemd[1]: Started Gunicorn instance to serve CNTK API.
Mar 21 07:51:44 hoaphumanoidserver systemd[1]: cntk_api.service: Main process exited, code=exited, status=217/USER
Mar 21 07:51:44 hoaphumanoidserver systemd[1]: cntk_api.service: Unit entered failed state.
Mar 21 07:51:44 hoaphumanoidserver systemd[1]: cntk_api.service: Failed with result 'exit-code'.

To solve this problem I had to remove the file cntk_api.sock, it is created automatically by gunicorn. This is the information of the file, once the system is working:

ls -lha
srwxrwx--- 1 hoaphumanoid www-data        0 Mar 21 08:11 cntk_api.sock

[miguelgfierro]

0f1c9bb