本文主要给大家介绍Keepalived1.4.0应用在MySQL 5.7.19上实现主备高可用，文章内容都是笔者用心摘选和编辑的，具有一定的针对性，对大家的参考意义还是比较大的，下面跟笔者一起了解下Keepalived1.4.0应用在MySQL 5.7.19上实现主备高可用吧。
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JDK 1.8_171
MySQL 5.7.19
CentOS 7.4
Keepalived 1.4.0
DB1：192.168.200.180
DB2：192.168.200.181
VIP： 192.168.200.99
下载地址：wget http://www.keepalived.org/software/keepalived-1.4.0.tar.gz 2台均按照此种方式进行安装
yum install gcc gcc-c++ make openssl openssl-devel net-snmp-devel psmisc ipvsadm libnfnetlink-devel popt popt-devel popt-static openssl-devel kernel-devel libnl libnl-devel -y # 安装依赖
cd /usr/local/src
tar -zvxf keepalived-1.4.0.tar.gz # 解压
cd keepalived-1.4.0
./configure --prefix=/usr/local/keepalived --enable-snmp # 编译
make && make install # 安装
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ # 拷贝配置
ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived
ln -s /usr/local/keepalived/sbin/keepalived /sbin/keepalivedDB1上面的配置：
[root@mysql01 keepalived-1.4.0]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_bak
[root@mysql01 keepalived-1.4.0]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
nvidiacheng@163.com
}
notification_email_from nvidiacheng@163.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id Node_Master
}
vrrp_instance VI_1 {
state BACKUP # 可配置master和backup模式，为了防止脑裂现象，主备均需要设置为backup模式，master模式会抢占VIP
interface ens33 # 网卡名
virtual_router_id 43 # VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
priority 100 # 权重，主节点要大于备节点
unicast_src_ip 192.168.200.180 # 本地IP地址
unicast_peer {
192.168.200.181 # 对端IP地址，此地址一定不能忘记
}
nopreempt # 配合backup,防止切换后，主库服务恢复正常后，IP漂移过来
advert_int 1 # 组播信息发送间隔，两个节点设置必须一样
authentication { # 设置验证信息，两个节点必须一致
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.200.99 # VIP地址
}
}
virtual_server 192.168.200.99 3306 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 192.168.200.180 3306 {
weight 1
notify_down /etc/keepalived/mysql.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
DB2上面配置
[root@mysql02 keepalived-1.4.0]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_bak
[root@mysql02 keepalived-1.4.0]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
nvidiacheng@163.com
}
notification_email_from nvidiacheng@163.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id Node_backup
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 43
priority 90
unicast_src_ip 192.168.200.181
unicast_peer {
192.168.200.180
}
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.200.99
}
}
virtual_server 192.168.200.99 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.200.181 3306{
weight 1
notify_down /etc/keepalived/mysql.sh
echo '3' > /etc/keepalived/t.log
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}mysql.sh脚本配置内容（2台一样）：
[root@mysql01 keepalived]# vim /etc/keepalived/mysql.sh
#!/bin/bash
run_status=`service keepalived status|grep running|wc -l`
pro_status=`ps -ef |grep keepalived|grep -v grep |wc -l`
service keepalived stop
if [ ${run_status} != 0 ] || [ ${pro_status} != 0 ]
then
pkill keepalived
fi给mysql.sh赋可执行权限
[root@mysql01 keepalived]# chmod +x mysql.sh都配置好后启动keepalived进行测试：
service keepalived start # 启动Keepalived
service keepalived restart # 重启Keepalived
service keepalived stop # 停止Keepalived
service keepalived status # 查看Keepalived运行状态
ps aux | grep keepalived # 查看Keepalived进程
2台均启动Keepalived后，分别查看网卡
从上图可以看出，VIP地址在主节点
使用Navicat工具分别连接2个节点和VIP节点
这个时候我们将节点1的MySQL停止，模拟主节点数据库故障来测试VIP是否会漂移到备节点
如上图，主节点MySQL停止后，Keepalived进程也结束了，VIP地址不见了
查看备节点的网卡，发现VIP已经漂移过来了
用Navicat打开VIP，可以正常访问，主节点无法打开
重新启动主节点MySQL服务和Keepalived服务，在停止备节点测试（略过）
看完以上关于Keepalived1.4.0应用在MySQL 5.7.19上实现主备高可用，很多读者朋友肯定多少有一定的了解，如需获取更多的行业知识信息 ，可以持续关注我们的行业资讯栏目的。
