CentOS 7
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Pen : MariaDB Load Balancing
2015/06/10
 
Configure Pen to Load Balance to 2 MariaDB backends. 
       |
-------+-----------------------------------------------
       |
       +-------------------+--------------------+
       |10.0.0.30          |10.0.0.51           |10.0.0.52
 +-----+------+    +-------+------+     +-------+------+
 |  Frontend  |    |   Backend#1  |     |   Backend#2  |
 | Pen Server |    |    MariaDB   |     |    MariaDB   |
 +------------+    +--------------+     +--------------+
[1] Configure Pen. Before this section, configure basic settings, refer to here.
[root@dlp ~]#
vi /etc/pen.conf
# create new

LOGFILE=/var/log/pen.log
WEBFILE=/var/www/pen/webstats.html
MAX_CONNECTIONS=256
ROUNDROBIN=true
# listening port

PORT=3306
# number of backends

BACKEND=2
# define backend servers

SERVER1=10.0.0.51:3306
SERVER2=10.0.0.52:3306
[root@dlp ~]#
systemctl restart pen

[2] Make sure all works fine to access to the frontend server from a Client with SQL like follows.
[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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