HAProxy : Layer 4 Load Balancing2021/03/17 |
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 /etc/haproxy/haproxy.cfg # change [mode] value in [defaults] section defaults mode tcp # 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] | If SELinux is enabled, change boolean setting. |
[root@dlp ~]# setsebool -P haproxy_connect_any on |
[3] | If Firewalld is running, allow ports HAProxy listens. |
[root@dlp ~]# firewall-cmd --add-service=mysql --permanent success [root@dlp ~]# firewall-cmd --reload success |
[4] | Verify working normally to access to frontend HAproxy Server. |
[root@client ~]# mysql -u cent -p -h 10.0.0.30 -e "show variables like 'hostname';" Enter password: +---------------+------------------+ | Variable_name | Value | +---------------+------------------+ | hostname | node02.srv.world | +---------------+------------------+[root@client ~]# mysql -u cent -p -h 10.0.0.30 -e "show variables like 'hostname';" Enter password: +---------------+------------------+ | Variable_name | Value | +---------------+------------------+ | hostname | node01.srv.world | +---------------+------------------+ |
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