Linux Keepalived 實現雙機熱備

試用keepalived來做雙機熱備，伺服器資訊如下：

伺服器1：centos / 192.168.18.20 [ip] / 192.168.18.22 [虛擬ip]

伺服器2：centos / 192.168.18.21 [ip] / 192.168.18.22 [虛擬ip]

1. 安裝keepalived

2臺server都使用下面的命令安裝keepalived：

yum install keepalived -y

$ vi /etc/keepalived/keepalived.conf

vrrp_instance vi_1 
virtual_ipaddress 
}

$ vi /etc/keepalived/keepalived.conf

vrrp_instance vi_1 
virtual_ipaddress 
}

$ service keepalived start

$ ip a

# server 1:
2: eth0: 
mtu 1500 qdisc pfifo_fast state up qlen 1000
link/ether 00:24:8c:8c:67:43 brd ff:ff:ff:ff:ff:ff
inet 192.168.18.20/24 brd 192.168.18.255 scope global eth0
inet 192.168.18.22/32 scope global eth0
inet6 fe80::224:8cff:fe8c:6743/64 scope link 
valid_lft forever preferred_lft forever
# server 2:
2: eth0: 
mtu 1500 qdisc pfifo_fast state up qlen 1000
link/ether 00:23:54:bf:ab:17 brd ff:ff:ff:ff:ff:ff
inet 192.168.18.21/24 brd 192.168.18.255 scope global eth0
inet 192.168.18.22/32 scope global eth0
inet6 fe80::223:54ff:febf:ab17/64 scope link 
valid_lft forever preferred_lft forever

瀏覽器訪問出現 this is server 1.

將192.168.18.20關閉，再訪問出現this is server 2.

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