MySQL keepalived] + [HA keepalived implemented with MySQL master master mode
https://www.jianshu.com/p/8694d07595bc
First, the experiments show
MySQL master main mode, is mainly from two mutually MySQL database.
This experiment is to achieve the main MySQL master mode with keepalived high availability, based on already installed MySQL master host architecture, and then configure keepalived, verify high availability!
Second, the experimental environment
Operating System: CentOS 7.5
Server: 192.168.1.104
serverB: 192.168.1.105
VIP: 192.168.1.110
Third, turn off selinux
# setenforce 0
# sed -i 's/^SELINUX=.*/SELINUX=permissive/g' /etc/selinux/config
Fourth, the firewall settings
and a second election firewalld iptables
Fifth, software installation
In serverA and serverB
# yum -y install epel-release
# yum -y install keepalived
Sixth, in serverA configuration keepalived
# vim /etc/keepalived/keepalived.conf
###########################################
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 150
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.110/24
}
}
virtual_server 192.168.1.110 3306 {
delay_loop 2
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 192.168.1.104 3306 {
weight 3
notify_down /etc/keepalived/restartKeepalived.sh
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
###################################################
# vim /etc/keepalived/restartKeepalived.sh
#################################
#!/bin/bash
systemctl restart keepalived
##################################
# chmod 700 /etc/keepalived/restartKeepalived.sh
七、在serverB配置keepalived
在serveB
# vim /etc/keepalived/keepalived.conf
###########################################
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 150
priority 90
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.110/24
}
}
virtual_server 192.168.1.110 3306 {
delay_loop 2
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 192.168.1.105 3306 {
weight 3
notify_down /etc/keepalived/restartKeepalived.sh
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
###################################################
# vim /etc/keepalived/restartKeepalived.sh
#################################
#!/bin/bash
systemctl restart keepalived
##################################
# chmod 700 /etc/keepalived/restartKeepalived.sh
八、验证MySQL的高可用性
在serverA
# ip addr list
# systemctl stop mysqld
在serverB
# ip addr list
从上可以看出，关闭serverA上的MySQL，vip成功漂移到了severB，数据库的连接不受影响，实现了一定程度的高可用。
两个注意点：
1. 具体通过vip连接到serverA或者severB 时，服务器上的vip才监听3306端口，无连接时，不监听
2. vip在serverA时，在severB上无法通过vip连接上数据库，反之亦然
九、参考
keepalived + mysql 实现单向备份、故障转移
https://www.jianshu.com/p/35030921dab5
Centos7+Keepalived实现Mariadb(MYSQL)的高可用(HA)
http://blog.51cto.com/gaowenlong/1888036