CentOS 7
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Nginx : Reverse Proxy Settings#32015/08/26

Configure Nginx for Reverse Proxy Settings with load barancing function.
(1) www.srv.world       []   - Nginx Server
(2) node01.srv.world   []   - Backend Web Server#1
(3) node02.srv.world   []   - Backend Web Server#2
(4) node03.srv.world   []   - Backend Web Server#3
[1] For example, Configure Nginx as a proxy server with load barancing for backend httpd Servers.
[root@www ~]#
vi /etc/nginx/nginx.conf
# add into http section

# "backup" means this server is baranced only when other servers are down

# "weight=*" means barancing weight

http {
    upstream backends {
        server node01.srv.world:80 weight=3;
        server node02.srv.world:80;
        server node03.srv.world:80 backup;

# change like follows in "server" section

    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://backends;

[root@www ~]#
systemctl restart nginx

  Access to Nginx Server from a Client to make sure it works normally.
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