部署双节点双主数据库服务器MySQL
分别在二台服务器上安装mysql，要求同版本或主服务器比从服务器版本高。
主机mysql配置：
Vi /etc/my.cnf
[mysqld]
Log-bin=mysql-bin
Server-id=1
Service mysqld restart
Mysql –uroot –p
从mysql配置：
Vi /etc/my.cnf
[mysqld]
Log-bin=mysql-bin
Server-id=2
然后从主mysql导出数据，mysql –uroot –p dump –single-transaction *** > ***.sql
导入到从mysql数据库：mysql –uroot –p *** < ***.sql（***表示数据库名）
从服务器：
可能遇到的问题：log-bin一定不是log_bin，并且位置在[mysqld]的里面。否则日志不能正常开启。
主服务器：
测试：
以下为部署keepalived双主高可用：
二个服务器IP10.16.37.101,10.16.37.94，一个VIP10.16.37.200。
安装keepalived：
下载keepalived-1.2.23.tar.gz
tar –xvf keepalived-1.2.23.tar.gz –C /opt
cd /opt/keepalived-1.2.23/
./configure prefix=/usr/local/keepalived
make & make install
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
vi /etc/keepalived/keepalived.conf
主配置：（10.16.37.101）
! Configuration File for keepalived
global_defs {
notification_email {
linuxidc@linuxidc.com #通知邮箱
}
notification_email_from linuxidc@linuxidc.com
smtp_server 127.0.0.1 #表示发送email时使用的smtp服务器地址，这里可以用本地的sendmail来实现
smtp_connect_timeout 30 #连接smtp超时时间
router_id MySQL-ha #一般为主机名
}
vrrp_instance VI_1 {
state BACKUP #都为BACKUP
interface eth0
virtual_router_id 51
priority 100 #权限100
advert_int 1
nopreempt #不抢占
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.16.37.200 #虚拟IP地址，即VIP
}
}
virtual_server 10.16.37.200 3306 { #监控端口及配置
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 10.16.37.101 3306 { #真实IP地址
weight 3
notify_down /usr/local/MySQL/bin/MySQL.sh #宕机脚本
TCP_CHECK {
connect_timeout 3
connect_port 3306
}
}
}
从配置：（10.16.37.94）
! Configuration File for keepalived
global_defs {
notification_email {
linuxidc@linuxidc.com #通知邮箱
}
notification_email_from linuxidc@linuxidc.com
smtp_server 127.0.0.1 #表示发送email时使用的smtp服务器地址，这里可以用本地的sendmail来实现
smtp_connect_timeout 30 #连接smtp超时时间
router_id Nginx-ha #一般为主机名
}
vrrp_instance VI_1 {
state BACKUP #都为BACKUP
interface eth0
virtual_router_id 51
priority 90 #权限90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.16.37.200 #虚拟IP地址，即VIP
}
}
virtual_server 10.16.37.200 3306 { #监控端口及配置
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 10.16.37.94 3306 { #真实IP地址
weight 3
notify_down /usr/local/MySQL/bin/MySQL.sh #宕机脚本
TCP_CHECK {
connect_timeout 3
connect_port 3306
}
}
}
vi /usr/local/MySQL/bin/MySQL.sh
#!/bin/bash
pkill keepalived
# chmod +x /usr/local/MySQL/bin/MySQL.sh
测试：关闭一台服务器mysql，ps aux | grep keepalved查看keepalived是否自动关闭。注意防火墙和selinux的关闭！！
Linux下HAProxy+Keepalived双机高可用方案