Nginx : Reverse Proxy2022/05/26

	Configure Nginx as a Reverse Proxy Server. For example, Configure Nginx that HTTP/HTTPS accesses to [www.srv.world] are forwarded to [node01.srv.world].
[1]	Get SSL certificates, refer to here.
[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://node01.srv.world/;
        }
    }

# for HTTPS setting

[root@www ~]#

vi /etc/nginx/conf.d/proxy-ssl.conf

# create new
# replace certificates 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://node01.srv.world/;
    }
}

[root@www ~]#

systemctl restart nginx

[3]	If SELinux 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@node01 ~]#

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  node01.srv.world;
        root         /usr/share/nginx/html;
        set_real_ip_from   10.0.0.0/24;
        real_ip_header     X-Forwarded-For;

[root@node01 ~]#

systemctl restart nginx

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

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