keepalived+mysql双主实现单ip访问
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本文为keepalived vip配置,mysql双主安装部署可以参考之前的mysql双主安装部署
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原理:通过配置keepalived将虚拟ip绑定到服务优先级更高的机器上(以下简称master1),当master1的mysql服务挂掉时,通过脚本干掉master1的keepalived服务,使虚拟ip自动绑定到master2。利用keepalived构建虚拟ip,实现mysql双主节点只需要通过一个虚拟ip即可访问,该方案的好处是避免上层的应用改造代码,同时实现了mysql的HA(该方案同样适合mysql的主从架构等等)
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环境:centos7 master1 ip:192.168.1.58 master2 ip:192.168.1.95
vip:192.168.1.168
1.master1 master2上都安装keepalive服务
yum install -y keepalived
2.master1和master2上分别配置keepalived.conf(注意:配置不同)
vi /etc/keepalived/keepalived.conf
master1 keepalived配置
! Configuration File for keepalived
global_defs
notification_email
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_instance VI_1
state MASTER
interface ens192 #实例绑定的网卡
virtual_router_id 51 #这里设置VRID,这里非常重要,相同的VRID为一个组,他将决定多播的MAC地址
priority 100 #设置本节点的优先级,优先级高的为master,如另外一个节点配置为90,那此节点就是master
advert_int 1 #检查间隔,默认为1秒
authentication
auth_type PASS
auth_pass 1111
virtual_ipaddress #虚ip
192.168.1.168
unicast_src_ip 192.168.1.58 #master1 ip
unicast_peer
192.168.1.95 #master2 ip
virtual_server 192.168.1.168 3307 #虚ip和端口
delay_loop 2 #每个2秒检查一次real_server状态
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.1.58 3307 #实ip和端口
weight 1
notify_down /dsj/script/keepalive.sh #当服务挂掉的时候执行的脚本
TCP_CHECK
connect_timeout 3 #连接超时时间
nb_get_retry 3 #重连次数
delay_before_retry 3 #重连间隔时间
connect_port 3307 #健康检查端口
master2 keepalived配置
! Configuration File for keepalived
global_defs notification_email
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL
vrrp_instance VI_1
state BACKUP
interface ens192
virtual_router_id 51
priority 90
advert_int 1
authentication
auth_type PASS
auth_pass 1111
virtual_ipaddress
192.168.1.168
unicast_src_ip 192.168.1.95
unicast_peer
192.168.1.58
virtual_server 192.168.1.168 3307
delay_loop 2
lb_algo rr
lb_kind NAT
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.1.95 3307
weight 2
notify_down /dsj/script/keepalive.sh
TCP_CHECK
connect_timeout 8
nb_get_retry 3
delay_before_retry 3
connect_port 3307
3.配置/dsj/script/keepalive.sh
vi /dsj/script/keepalive.sh
chmod 755 /dsj/script/keepalive.sh
#!/bin/sh
pkill keepalived
sleep 10s
systemctl start keepalived
sleep 120s
systemctl start mysqld
4.开启keepalived服务
systemctl start keepalived
查看keepalived状态
可以发现vip已经被绑定到网卡上了
或者
ip addr
也能看到网卡上绑定的vip
测试:
1.master1上使用vip连接mysql,连接成功
mysql -h vip -u user -p
2.关闭master1的mysql服务,可以看到keepalived的服务也被关闭了,这是因为第三步的脚本生效了,此时在查看master2的网卡信息,可以看到vip已经被绑定到了master2上
3.master2上使用vip连接mysql,连接成功
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