(13: Permission denied) while connecting to upstream:[nginx]

问题

I am working with configuring Django project with Nginx and Gunicorn.

While I am accessing my port gunicorn mysite.wsgi:application --bind=127.0.0.1:8001 in Nginx server, I am getting the following error in my error log file;

2014/05/30 11:59:42 [crit] 4075#0: *6 connect() to 127.0.0.1:8001 failed (13: Permission denied) while connecting to upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8001/", host: "localhost:8080"

Below is the content of my nginx.conf file;

server {
    listen 8080;
    server_name localhost;
    access_log  /var/log/nginx/example.log;
    error_log /var/log/nginx/example.error.log;

    location / {
        proxy_pass http://127.0.0.1:8001;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $http_host;
    }
}

In the HTML page I am getting 502 Bad Gateway.

What mistake am I doing?

回答1:

I had a similar issue getting Fedora 20, Nginx, Node.js, and Ghost (blog) to work. It turns out my issue was due to SELinux.

This should solve the problem:

setsebool -P httpd_can_network_connect 1

Details

I checked for errors in the SELinux logs:

sudo cat /var/log/audit/audit.log | grep nginx | grep denied

And found that running the following commands fixed my issue:

sudo cat /var/log/audit/audit.log | grep nginx | grep denied | audit2allow -M mynginx
sudo semodule -i mynginx.pp

References:

http://blog.frag-gustav.de/2013/07/21/nginx-selinux-me-mad/

https://wiki.gentoo.org/wiki/SELinux/Tutorials/Where_to_find_SELinux_permission_denial_details

http://wiki.gentoo.org/wiki/SELinux/Tutorials/Managing_network_port_labels

http://www.linuxproblems.org/wiki/Selinux

回答2:

I’ve run into this problem too. Another solution is to toggle the SELinux boolean value for httpd network connect to on (Nginx uses the httpd label).

setsebool httpd_can_network_connect on

To make the change persist use the -P flag.

setsebool httpd_can_network_connect on -P

You can see a list of all available SELinux booleans for httpd using

getsebool -a | grep httpd

回答3:

Had a similar problem on Centos 7. When I tried to apply the solution prescribed by Sorin, I started moving in cycles. First I had a permission {write} denied. Then when I solved that I had a permission { connectto } denied. Then back again to permission {write } denied.

Following @Sid answer above of checking the flags using getsebool -a | grep httpd and toggling them I found that in addition to the httpd_can_network_connect being off. http_anon_write was also off resulting in permission denied write and permission denied {connectto}

type=AVC msg=audit(1501830505.174:799183): avc:  
denied  { write } for  pid=12144 comm="nginx" name="myroject.sock" 
dev="dm-2" ino=134718735 scontext=system_u:system_r:httpd_t:s0 
tcontext=system_u:object_r:default_t:s0 tclass=sock_file

Obtained using sudo cat /var/log/audit/audit.log | grep nginx | grep denied as explained above.

So I solved them one at a time, toggling the flags on one at a time.

setsebool httpd_can_network_connect on -P

Then running the commands specified by @sorin and @Joseph above

sudo cat /var/log/audit/audit.log | grep nginx | grep denied | 
audit2allow -M mynginx
sudo semodule -i mynginx.pp

Basically you can check the permissions set on setsebool and correlate that with the error obtained from grepp'ing' audit.log nginx, denied

回答4:

I have solved my problem by running my Nginx as the user I'm currently logged in with, mulagala.

By default the user as nginx is defined at the very top section of the nginx.conf file as seen below;

user nginx; # Default Nginx user

Change nginx to the name of your current user - here, mulagala.

user mulagala; # Custom Nginx user (as username of the current logged in user)

However, this may not address the actual problem and may actually have casual side effect(s).

For an effective solution, please refer to Joseph Barbere's solution.

回答5:

if "502 Bad Gateway" error throws on centos api url for api gateway proxy pass on nginx , run following command to solve the issue

sudo setsebool -P httpd_can_network_connect 1

回答6:

13-permission-denied-while-connecting-to-upstreamnginx on centos server -

setsebool -P httpd_can_network_connect 1

回答7:

I’ve run into this problem too. I'm using Nginx with HHVM, below solution fixed my issue:

sudo semanage fcontext -a -t httpd_sys_rw_content_t "/etc/nginx/fastcgi_temp(/.*)?"

sudo restorecon -R -v /etc/nginx/fastcgi_temp

回答8:

Check the user in /etc/nginx/nginx.conf
Change ownership to user.

sudo chown -R nginx:nginx /var/lib/nginx

Now see the magic.

回答9:

sudo cat /var/log/audit/audit.log | grep nginx | grep denied | audit2allow -M mynginx

sudo semodule -i mynginx.pp

来源：https://stackoverflow.com/questions/23948527/13-permission-denied-while-connecting-to-upstreamnginx

标签

django

python-2.7

nginx

gunicorn