Ubuntu 22.04
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HAProxy : Layer 4 Load Balancing
2022/05/19
 
Configure HAProxy on Layer 4 Mode.
On this example, configure MariaDB backend like the following environment.
-----------+---------------------------+--------------------------+------------
           |                           |                          |
           |10.0.0.30                  |10.0.0.51                 |10.0.0.52
+----------+-----------+   +-----------+----------+   +-----------+----------+
|   [ dlp.srv.world ]  |   | [ node01.srv.world ] |   | [ node02.srv.world ] |
|        HAProxy       |   |   MariaDB Server#1   |   |   MariaDB Server#2   |
+----------------------+   +----------------------+   +----------------------+

[1] Configure HAProxy.
root@dlp:~#
vi /etc/haproxy/haproxy.cfg
# change [mode] value in [defaults] section

defaults
        log             global
        mode            tcp

# add to the end
# define frontend and backend servers
frontend mysql-in
        bind *:3306
        default_backend backend_dbservers

backend backend_dbservers
        balance         roundrobin
        server          node01 10.0.0.51:3306 check
        server          node02 10.0.0.52:3306 check

root@dlp:~#
systemctl restart haproxy

[2] Verify working normally to access to the frontend HAproxy Server.
debian@client:~#
mysql -u ubuntu -p -h dlp.srv.world -e "show variables like 'hostname';"

Enter password:
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node01.srv.world |
+---------------+------------------+

debian@client:~#
mysql -u ubuntu -p -h dlp.srv.world -e "show variables like 'hostname';"

Enter password:
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node02.srv.world |
+---------------+------------------+
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