Nginx : Load Balancing2019/08/08

Configure Nginx as a Load Balancing Server.
This example is based on the environment like follows.

-----------+---------------------------+-----
           |                           |
           |10.0.0.30                  |
+----------+-----------+               |
|   [ www.srv.world ]  |               |
|        Nginx         |               |
+----------------------+               |
                                       |
------------+--------------------------+--------------------------+------------
            |                          |                          |
            |10.0.0.51                 |10.0.0.52                 |10.0.0.53
+-----------+----------+   +-----------+----------+   +-----------+----------+
| [ node01.srv.world ] |   | [ node02.srv.world ] |   | [ node03.srv.world ] |
|      Web Server#1    |   |      Web Server#2    |   |      Web Server#3    |
+----------------------+   +----------------------+   +----------------------+

[1]	Configure Nginx.

root@www:~#

vi /etc/nginx/nginx.conf

# add into [http] section

# [backup] means this server is balanced only when other servers are down

# [weight=*] means balancing weight

http {
        upstream backends {
                server node01.srv.world:80 weight=2;
                server node02.srv.world:80;
                server node03.srv.world:80 backup;
        }

root@www:~#

vi /etc/nginx/sites-available/default

# 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

[2]	Verify it works fine to access to frontend Nginx from any Client Host with HTTP.

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