nginx error “page is temporarily unavailable”

Question

I’ve SSH installed a Python 3.5 application on CentOS along with uwsgi and nginx, but after doing asudo vi /etc/nginx/nginx.conf to edit the nginx config file as per usual, the response is currently:

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

these are the contents of the /etc/nginx/nginx.conf file:

sendfile            on;
tcp_nopush          on;
tcp_nodelay         on;
keepalive_timeout   65;
types_hash_max_size 2048;

include             /etc/nginx/mime.types;
default_type        application/octet-stream;

include /etc/nginx/conf.d/*.conf;

server {
    listen      [::]:80 default_server;
    server_name  _;
    root         /var/www/html/<directory//;

    location / {
    }

The server is currently showing an nginx error page

Answer 1

hansen July 18, 2017

Hi @dev5

Can you run sudo nginx -t or sudo service nginx configtest to test your configuration.
And then post the last 30 lines from the error log also:

tail -30 /var/log/nginx/error.log

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Answer 2

hansen July 18, 2017

@dev5

Uhm, but your Nginx has server_name localhost; which means it’s only accessible from the server itself.
Can you post your entire Nginx site configuration and your entire uWSGI?
And I would recommend that you do not have any server blocks in your main Nginx configuration located in /etc/nginx/nginx.conf

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dev5 July 18, 2017

SELinux is disabled: sudo setenforce 0
localhost: is now the server’s IPv4 location.
I’ve posted the full config files below.
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dev5 July 18, 2017

According to this article https://www.nginx.com/resources/wiki/start/topics/examples/server_blocks/
localhost is just a redundant value
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- hansen July 18, 2017
  
  @dev5
  Where does it mention localhost?
  Even the server_name configuration directive doesn’t mention localhost:
  http://nginx.org/en/docs/http/server_names.html
  
  Reply Report

Answer 3

dev5 July 18, 2017

SELinux is disabled: sudo setenforce 0
localhost: is now the server’s IPv4 location.
I’ve posted the full config files below.
Reply Report
dev5 July 18, 2017

According to this article https://www.nginx.com/resources/wiki/start/topics/examples/server_blocks/
localhost is just a redundant value
Reply Report
- hansen July 18, 2017
  
  @dev5
  Where does it mention localhost?
  Even the server_name configuration directive doesn’t mention localhost:
  http://nginx.org/en/docs/http/server_names.html
  
  Reply Report

Answer 4

dev5 July 18, 2017

[deleted]

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dev5 July 18, 2017

Config test was completed successfully with no syntax errors.

2017/07/18 15:34:04 [crit] 2829#0: *41 connect() to unix:/var/www/html/pricing-service/socket.sock failed (2: No such file or directory) while connecting to upstream, client: 90.63.208.189, server: localhost, request: "HEAD http://178.62.201.111:80/phpmyadmin2013/ HTTP/1.1", upstream: "uwsgi://unix:/var/www/html/pricing-service/socket.sock:", host: "178.62.201.111"

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hansen July 18, 2017

@dev5

But is the socket location in uWSGI the same as in Nginx?

/var/www/html/pricing-service/socket.sock

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dev5 July 18, 2017

[Nginx]

server {
    listen 80;
    real_ip_header X-Forwarded-For;
    set_real_ip_from 127.0.0.1;
    server_name localhost;

location / {
    include uwsgi_params;
    uwsgi_pass unix:/var/www/html/pricing-service/socket.sock;
    uwsgi_modifier1 30;
    }

[uWSGI]

[uwsgi]
#application's base folder
base = /var/www/html/pricing-service

#python module to import
app = src.app
module = %(app)

home = %(base)/venv
pythonpath = %(base)

#socket file's location
socket = /var/www/html/pricing-service/socket.sock

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noobie July 18, 2017

[deleted]
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Answer 5

dev5 July 18, 2017

Config test was completed successfully with no syntax errors.

2017/07/18 15:34:04 [crit] 2829#0: *41 connect() to unix:/var/www/html/pricing-service/socket.sock failed (2: No such file or directory) while connecting to upstream, client: 90.63.208.189, server: localhost, request: "HEAD http://178.62.201.111:80/phpmyadmin2013/ HTTP/1.1", upstream: "uwsgi://unix:/var/www/html/pricing-service/socket.sock:", host: "178.62.201.111"

Reply Report

hansen July 18, 2017

@dev5

But is the socket location in uWSGI the same as in Nginx?

/var/www/html/pricing-service/socket.sock

Reply Report

dev5 July 18, 2017

[Nginx]

server {
    listen 80;
    real_ip_header X-Forwarded-For;
    set_real_ip_from 127.0.0.1;
    server_name localhost;

location / {
    include uwsgi_params;
    uwsgi_pass unix:/var/www/html/pricing-service/socket.sock;
    uwsgi_modifier1 30;
    }

[uWSGI]

[uwsgi]
#application's base folder
base = /var/www/html/pricing-service

#python module to import
app = src.app
module = %(app)

home = %(base)/venv
pythonpath = %(base)

#socket file's location
socket = /var/www/html/pricing-service/socket.sock

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noobie July 18, 2017

[deleted]
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Answer 6

dev5 July 18, 2017

/etc/nginx/nginx.conf file:
https://jpst.it/11K8f

and `/etc/init/uwsgi.conf config file:
https://jpst.it/11K8T

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hansen July 18, 2017

@dev5
But there’s no uwsgi_pass in that Nginx configuration. That’s just your main Nginx configuration. And the main Nginx configuration should not have any server blocks. And it looks like there’s multiple server blocks with the same information - all of them incorrect.
Your server blocks should be located in separate files in /etc/nginx/default.d/*.conf
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- dev5 July 18, 2017
  
  Ah! okay, the uwsgi_pass is here /etc/nginx/conf.d/default.conf
  
  https://jpst.it/11KEZ
  
  Reply Report
  
  hansen July 18, 2017
  
  @dev5
  Then remove all the server blocks from /etc/nginx/nginx.conf and restart Nginx.
  
  Reply Report

Answer 7

hansen July 18, 2017

@dev5
But there’s no uwsgi_pass in that Nginx configuration. That’s just your main Nginx configuration. And the main Nginx configuration should not have any server blocks. And it looks like there’s multiple server blocks with the same information - all of them incorrect.
Your server blocks should be located in separate files in /etc/nginx/default.d/*.conf
Reply Report
- dev5 July 18, 2017
  
  Ah! okay, the uwsgi_pass is here /etc/nginx/conf.d/default.conf
  
  https://jpst.it/11KEZ
  
  Reply Report
  
  hansen July 18, 2017
  
  @dev5
  Then remove all the server blocks from /etc/nginx/nginx.conf and restart Nginx.
  
  Reply Report

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