Nginx : Use Stream module2022/05/12

Configure Nginx to use Stream module.
It's possible to proxy TCP, UDP (Nginx 1.9.13 and later for UDP), UNIX-domain sockets requests.

This example is based on the environment like follows to proxy MariaDB requests to backend servers.

-----------+---------------------------+-----
           |                           |
           |10.0.0.31                  |
+----------+-----------+               |
|   [ www.srv.world ]  |               |
|        Nginx         |               |
+----------------------+               |
                                       |
------------+--------------------------+-----------
            |                          |           
            |10.0.0.51                 |10.0.0.52  
+-----------+----------+   +-----------+----------+
| [ node01.srv.world ] |   | [ node02.srv.world ] |
|       Mariadb#1      |   |       Mariadb#2      |
+----------------------+   +----------------------+

[1]	Configure Nginx.

root@www:~#

apt -y install libnginx-mod-stream

root@www:~#

vi /etc/nginx/nginx.conf

# add to the end
# [weight=*] means balancing weight

stream {
    upstream mariadb-backend {
        server 10.0.0.51:3306 weight=2;
        server 10.0.0.52:3306;
    }
    server {
        listen 3306;
        proxy_pass mariadb-backend;
    }
}

root@www:~#

systemctl reload nginx

[2]	Verify it works fine to access to frontend Nginx server from any client computer.

ubuntu@client:~$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';"
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node01.srv.world |
+---------------+------------------+
ubuntu@client:~$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';"
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node01.srv.world |
+---------------+------------------+
ubuntu@client:~$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';"
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node02.srv.world |
+---------------+------------------+
ubuntu@client:~$ mysql -u serverworld -ppassword -h www.srv.world -e "show variables like 'hostname';"
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node01.srv.world |
+---------------+------------------+

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