HAProxy : Load Balancing on Layer42018/12/04

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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