keepalived高可用

第一步：下载

╭─root@zxw7 ~
╰─➤ yum install keepalived
第二步：注释不需要的
╭─root@zxw7 ~
╰─➤ vim /etc/keepalived/keepalived.conf

36 #virtual_server 192.168.200.100 443 {

:36,$ s/^/#/g

第三步：配置
╭─root@zxw7 ~
╰─➤ vim /etc/keepalived/keepalived.conf

19 vrrp_instance VI_1 {
20 state MASTER
21 interface ens33
22 virtual_router_id 88
23 priority 100
24 advert_int 1
25 authentication {
26 auth_type PASS
27 auth_pass 1111
28 }
29 virtual_ipaddress {
30 192.168.126.77
31 }

第四步：启动
╭─root@zxw7 /etc/sysconfig/network-scripts
╰─➤ systemctl start keepalived

第五步：查看
─root@zxw7 /etc/sysconfig/network-scripts
╰─➤ ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:5a:a5:f0 brd ff:ff:ff:ff:ff:ff
inet 192.168.126.7/24 brd 192.168.126.255 scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.126.77/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe5a:a5f0/64 scope link
valid_lft forever preferred_lft forever

第六步：复制到备用主机
╭─root@zxw7 /etc/sysconfig/network-scripts
╰─➤ scp /etc/keepalived/keepalived.conf root@192.168.126.8:/etc/keepalived/keepalived.conf

第七步：切换到备用主机
[root@zxw8 ~]# vim /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 88
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.126.88
}
}
不会显示配用

第八步：启动
[root@zxw8 ~]# systemctl start keepalived

测试
╭─root@zxw7 /etc/sysconfig/network-scripts
╰─➤ systemctl stop keepalived
[root@zxw8 ~]# ip a
inet 192.168.126.88/32 scope global ens33

互为主副

192.168.126.8 主
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 88
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 8888
}
virtual_ipaddress {
192.168.126.77

}
}
vrrp_instance VI_2 {
state BACKUP
interface ens33
virtual_router_id 77
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 8888
}
virtual_ipaddress {
192.168.126.87

}
}

192.168.126.7 备
vrrp_instance VI_1 {
state BACKUP #角色类型MASTER|BACKUP
interface ens33 #网卡名称
virtual_router_id 88 #虚拟路由id（需要与BACKUP一致）
priority 99 #优先级
advert_int 1 #没1秒检查一次
authentication {
auth_type PASS #认证类型 主备之间必须一样
auth_pass 8888 #认证密码 主备之间必须一样
}
virtual_ipaddress {
192.168.126.77 #虚拟ip（vip）


}
}
vrrp_instance VI_2 {
state MASKET
interface ens33
virtual_router_id 77
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 8888
}
virtual_ipaddress {
192.168.126.87

}
}

Ip a 查看