HAProxy : Load Balancing on Layer42016/06/07 |
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Configure HAProxy on Layer4 Mode.
This example based on the environment like follows.
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-------+-----------------------------------------------
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+-------------------+--------------------+
|10.0.0.30 |10.0.0.51 |10.0.0.52
+-----+-----+ +-------+------+ +-------+------+
| Frontend | | Backend#1 | | Backend#2 |
| HAProxy | | MariaDB | | MariaDB |
+-----------+ +--------------+ +--------------+
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| [1] | Configure HAProxy. |
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root@dlp:~#
vi /etc/haproxy/haproxy.cfg
global
log 127.0.0.1 local2 info
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 256
user haproxy
group haproxy
daemon
defaults
# set "mode tcp" for Layer4
mode tcp
log global
timeout connect 10s
timeout client 30s
timeout server 30s
# define frontend and backend servers
frontend mysql-in
bind *:3306
default_backend backend_servers
backend backend_servers
balance roundrobin
server db01 10.0.0.51:3306 check
server db02 10.0.0.52:3306 check
systemctl restart haproxy |
| [2] | Make sure all works fine to access to the frontend server from a Client with SQL like follows. |
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root@desktop:~# mysql -u keystone -p -h 10.0.0.30 keystone -e "select * from table01;" Enter password: +------+-------------------+ | id | name | +------+-------------------+ | 1 | db01.srv.world | +------+-------------------+root@desktop:~# mysql -u keystone -p -h 10.0.0.30 keystone -e "select * from table01;" Enter password: +------+-------------------+ | id | name | +------+-------------------+ | 1 | db02.srv.world | +------+-------------------+ |
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