準(zhǔn)備

裝備兩個(gè)機(jī)器辰如，IP地址信息如下：

host1： 192.168.56.103
host2： 192.168.56.104

為了測(cè)試需要贵试，分別在兩個(gè)機(jī)器上安裝apache并啟動(dòng)httpd服務(wù)，使下面兩個(gè)url均可訪問(wèn)

• http://192.168.56.103
• http://192.168.56.104

安裝 keepalived

在兩臺(tái)機(jī)器上分別安裝 keepalived

$ sudo yum install -y keepalived

配置 keepalived

host1 上 keepalived 配置

$ cat /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state MASTER
    interface eth2
    virtual_router_id 51
    priority 101
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.56.105
    }
}

host2 上 keepalived 配置

$ cat /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
    state MASTER
    interface eth2
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.56.105
    }
}

啟動(dòng) keepalived 服務(wù)

$ sudo service keepalived start
$ sudo chkconfig keepalived on

測(cè)試

服務(wù)啟動(dòng)后豌蟋，先訪問(wèn)下面的虛擬地址訪問(wèn)http服務(wù)器

http://192.168.56.105

查看IP地址信息

host1 上 IP 地址信息

$ ip addr show eth2
3: eth2: <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 192.168.56.103/24 brd 192.168.56.255 scope global eth2
    inet 192.168.56.105/32 scope global eth2
    inet6 fe80::a00:27ff:fe32:8382/64 scope link
       valid_lft forever preferred_lft forever

• 其中可以看到 inet 192.168.56.105/32 scope global eth2梧疲，說(shuō)明現(xiàn)在host1是作為虛擬IP的master來(lái)運(yùn)行的幌氮。

host2 上 IP 地址信息

$ ip addr show eth2
3: eth2: <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 192.168.56.104/24 brd 192.168.56.255 scope global eth2
    inet6 fe80::a00:27ff:feec:907b/64 scope link
       valid_lft forever preferred_lft forever

• 此時(shí)host2上ip地址信息中不包含虛擬IP “192.168.56.105” 信息该互。

驗(yàn)證 IP 地址 Failover

現(xiàn)在手動(dòng)停止host1上的 keepalived 服務(wù)

$ sudo service keepalived stop

host1 上 IP 地址信息

$ ip addr show eth2
3: eth2: <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 192.168.56.103/24 brd 192.168.56.255 scope global eth2
    inet6 fe80::a00:27ff:fe32:8382/64 scope link
       valid_lft forever preferred_lft forever

• 此時(shí) host1 上 ip 地址信息中不再包含虛擬IP “192.168.56.105” 信息韭畸。

host2 上 IP 地址信息

$ ip addr show eth2
3: eth2: <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 192.168.56.104/24 brd 192.168.56.255 scope global eth2
    inet 192.168.56.105/32 scope global eth2
    inet6 fe80::a00:27ff:feec:907b/64 scope link
       valid_lft forever preferred_lft forever

• 現(xiàn)在可以看到 host2 上 ip 地址信息中已經(jīng)包含虛擬IP “192.168.56.105” 信息了陆盘。

此時(shí)如果再把 host1 上的 keepalived 服務(wù)啟動(dòng)，會(huì)發(fā)現(xiàn)虛擬IP “192.168.56.105” 又重新綁定到 host1 上了太防。