keepalived设置虚拟IP, 实现IP漂移

使用 keepalived 设置虚拟 IP 环境

准备

准备三个机器，IP地址信息如下：

host1： 192.168.2.206

host2： 192.168.2.205

hots3:  192.168.2.177

安装 keepalived

在两台机器上分别安装 keepalived

$ sudo yum install -y keepalived

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配置 keepalived

host1 上 keepalived 配置

$ cat /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {

    state MASTER

    interface ens160

    virtual_router_id 51

    priority 101

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.2.98

    }

}

host2 上 keepalived 配置

$ cat /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 51

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.2.98

    }

}

Host3 上 keepalived 配置

$ cat /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {

    state BACKUP

    interface ens160

    virtual_router_id 51

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.2.98

    }

}

启动 keepalived 服务

$ sudo service keepalived start

$ sudo chkconfig keepalived on

查看IP地址信息

host1 上 IP 地址信息

$ ip addr show ens160

3: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:32:83:82 brd ff:ff:ff:ff:ff:ff

    inet 192.168.2.205/24 brd 192.168.2.255 scope global eth2

    inet 192.168.2.98/32 scope global eth2

    inet6 fe80::a00:27ff:fe32:8382/64 scope link

       valid_lft forever preferred_lft forever

7
其中可以看到 inet 192.168.2.98/32 scope global ens160，说明现在host1是作为虚拟IP的master来运行的。
host2 上 IP 地址信息

$ ip addr show eth0

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:ec:90:7b brd ff:ff:ff:ff:ff:ff

    inet 192.168.2.206/24 brd 192.168.56.255 scope global eth2

    inet6 fe80::a00:27ff:feec:907b/64 scope link

       valid_lft forever preferred_lft forever

此时host2上ip地址信息中不包含虚拟IP “192.168.56.105” 信息。
验证 IP 地址 Failover

现在手动停止host1上的 keepalived 服务

$ sudo service keepalived stop

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host1 上 IP 地址信息

$ ip addr show eth0

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:32:83:82 brd ff:ff:ff:ff:ff:ff

    inet 192.168.2.205 /24 brd 192.168.56.255 scope global eth2

    inet6 fe80::a00:27ff:fe32:8382/64 scope link

       valid_lft forever preferred_lft forever

此时 host1 上 ip 地址信息中不再包含虚拟IP “192.168.56.105” 信息。
host2 上 IP 地址信息

$ ip addr show eth0

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:ec:90:7b brd ff:ff:ff:ff:ff:ff

    inet 192.168.2.206/24 brd 192.168.56.255 scope global eth2

    inet 192.168.2.98/32 scope global eth2

    inet6 fe80::a00:27ff:feec:907b/64 scope link

       valid_lft forever preferred_lft forever

现在可以看到 host2 上 ip 地址信息中已经包含虚拟IP “192.168.2.98” 信息了。
此时如果再把 host1 上的 keepalived 服务启动，会发现虚拟IP “192.168.2.98” 又重新绑定到 host1 上了。

参考链接：https://blog.csdn.net/wexiaoword/java/article/details/81364488