Keepalived双主模式配置流程

实验说明

1）keepalived 支持配置多个VRRP实例，每个实例对应一个业务
2）本次实验将实现 keepalived 的互为主备：
业务A：keepalived01为Master，keepalived02为Backup
业务B：keepalived01为Backup，keepalived02为Master

环境介绍

1）K1
Hostname：keepalived01.example.com
IP：192.168.3.31
OS：Centos 7
2）K2
Hostname：keepalived02.example.com
IP：192.168.3.25
OS：Centos 7
3）VIP
业务A：192.168.3.33
业务B：192.168.3.133

安装配置

1、环境准备（略）
1）主机名配置
2）hosts文件解析
3）时间同步

2、keepalived01
[root@keepalived01 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
admin@example.com
yunwei@idoool.com
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id keepalived01
}
vrrp_instance A1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.3.33/24 dev eth0 label eth0:0
}
}
vrrp_instance B1 {
state BACKUP
interface eth0
virtual_router_id 52
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
192.168.3.133/24 dev eth0 label eth0:1
}
}

3、keepalived01
[root@keepalived02 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
admin@example.com
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id keepalived02
}
vrrp_instance A2 {
state BCAKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.3.33/24 dev eth0 label eth0:0
}
}
vrrp_instance B2 {
state MASTER
interface eth0
virtual_router_id 52
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
192.168.3.133/24 dev eth0 label eth0:1
}
}

4、配置测试
[root@keepalived01 ~]# systemctl reload keepalived.service
[root@keepalived01 ~]# ifconfig|grep 192.168.3.33|wc -l
1
[root@keepalived01 ~]# ifconfig|grep 192.168.3.133|wc -l
0

[root@keepalived02 ~]# systemctl reload keepalived.service
[root@keepalived02 ~]# ifconfig|grep 192.168.3.33|wc -l
0
[root@keepalived02 ~]# ifconfig|grep 192.168.3.133|wc -l
1

[root@keepalived01 ~]# systemctl stop keepalived.service
[root@keepalived01 ~]# ifconfig|grep 192.168.3.33|wc -l
0
[root@keepalived01 ~]# ifconfig|grep 192.168.3.133|wc -l
0

[root@keepalived02 ~]# ifconfig|grep 192.168.3.33|wc -l
1
[root@keepalived02 ~]# ifconfig|grep 192.168.3.133|wc -l
1

[root@keepalived02 ~]# systemctl stop keepalived.service
[root@keepalived02 ~]# ifconfig|grep 192.168.3.33|wc -l
0
[root@keepalived02 ~]# ifconfig|grep 192.168.3.133|wc -l
0
[root@keepalived01 ~]# systemctl start keepalived.service
[root@keepalived01 ~]# ifconfig|grep 192.168.3.33|wc -l
1
[root@keepalived01 ~]# ifconfig|grep 192.168.3.133|wc -l
1