FreeBSD 14
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HAProxy : Layer 4 Load Balancing2024/04/16
 

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 /usr/local/etc/haproxy.conf
# change [mode] value in [defaults] section

defaults
    mode            tcp

# define MariaDB for frontend, backend
frontend mysql-in
    bind *:3306
    default_backend backend_db

backend backend_db
    balance         roundrobin
    server          node01 10.0.0.51:3306 check
    server          node02 10.0.0.52:3306 check
root@dlp:~ #
service haproxy reload

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

Enter password:
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| hostname      | node02.srv.world |
+---------------+------------------+
root@client:~ #
mysql -u freebsd -p -h dlp.srv.world -e "show variables like 'hostname';"

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