CentOS Stream 8
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Nginx : Reverse Proxy
2021/04/08
 
Configure Nginx as a Reverse Proxy Server.
For example, Configure Nginx that HTTP/HTTPS accesses to [www.srv.world] are forwarded to [dlp.srv.world].
[1]
[2] Configure Nginx.
# for HTTP setting

[root@www ~]#
vi /etc/nginx/nginx.conf
# change [server] section like follows

    server {
        listen      80 default_server;
        listen      [::]:80 default_server;
        server_name www.srv.world;

        proxy_redirect      off;
        proxy_set_header    X-Real-IP $remote_addr;
        proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header    Host $http_host;

        location / {
            proxy_pass http://dlp.srv.world/;
        }
    }

# for HTTPS setting

[root@www ~]#
vi /etc/nginx/conf.d/proxy-ssl.conf
# create new

# replace certifictates to your own one

server {
    listen      443 ssl http2 default_server;
    listen      [::]:443 ssl http2 default_server;
    server_name www.srv.world;

    ssl_certificate "/etc/letsencrypt/live/www.srv.world/fullchain.pem";
    ssl_certificate_key "/etc/letsencrypt/live/www.srv.world/privkey.pem";
    ssl_session_cache shared:SSL:1m;
    ssl_session_timeout  10m;
    ssl_ciphers PROFILE=SYSTEM;
    ssl_prefer_server_ciphers on;

    proxy_redirect      off;
    proxy_set_header    X-Real-IP $remote_addr;
    proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header    Host $http_host;

    location / {
        proxy_pass http://dlp.srv.world/;
    }
}

[root@www ~]#
systemctl restart nginx

[3] If SELnux is enabled, change boolean setting.
[root@www ~]#
setsebool -P httpd_can_network_connect on
[4] Configure backend Nginx server to log X-Forwarded-For header.
[root@dlp ~]#
vi /etc/nginx/nginx.conf
# make sure settings [log_format] in [http] section

# OK if set [http_x_forwarded_for]

http {
        log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                        '$status $body_bytes_sent "$http_referer" '
                        '"$http_user_agent" "$http_x_forwarded_for"';

# add into [server] section

# specify your local network for [set_real_ip_from]

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  dlp.srv.world;
        root         /usr/share/nginx/html;
        set_real_ip_from   10.0.0.0/24;
        real_ip_header     X-Forwarded-For;

[root@dlp ~]#
systemctl restart nginx

[5] Verify it works fine to access to frontend Nginx Server from any Client Computer.
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