Ubuntu 18.04
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HAProxy : Load Balancing on Layer4
2018/12/04
 
Configure HAProxy on Layer4 Mode.
Actually, it's possible to load balancing only TCP, not UDP.
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 defaults section like follows

defaults
        log             global
        mode            tcp
        timeout connect 5000
        timeout client  50000
        timeout server  50000

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

backend backend_servers
        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 frontend HAproxy Server.
ubuntu@client:~#
mysql -u keystone -p -h dlp.srv.world -e "show variables like 'hostname';"

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

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

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