1.环境设定
#部署mariadb数据库
root@webserver1+2 \~\]# dnf install mariadb-server mariadb -y  \[root@webserver1+2 \~\]# vim /etc/my.cnf.d/mariadb-server.cnf  \[root@webserver1+2 \~\]#systemctl start mariadb #建立远程登录用户并授权 \[root@webserver2+1 \~\]# mysql  web1  web2  2.四层负载操作 \[root@haproxy \~\]# vim /etc/haproxy/haproxy.cfg  \[root@haproxy \~\]#systemctl restart haproxy.service #测试：  ### backup参数 \[root@haproxy \~\]# vim /etc/haproxy/haproxy.cfg  \[root@haproxy \~\]#systemctl restart haproxy.service #测试   #关闭10的mariadb并等待1分钟 \[root@webserver1 \~\]# systemctl stop mariadb  #还原故障主机等待片刻 \[root@webserver1 \~\]# systemctl start mariadb 