keepalived配置
之前已经安装完成，接下来我们配置keepalived。
假设我的ip地址如下：
server1:192.168.0.150
server2:192.168.0.157
vip:192.168.0.50
在两台服务器上分别执行如下命令：
[@server_150 keepalived]# mkdir /etc/keepalived
[@server_150 keepalived]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[@server_150 keepalived]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[@server_150 keepalived]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
对应操作的含义：
mkdir /etc/keepalived ##为keepalived创建配置文件目录，默认配置文件从/etc/keepalived下读取
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/ ##复制keepalived的二进制命令
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ ##提供启动脚本
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ ##keepalived的主配置文件
编辑/etc/keepalived/keepalived.conf文件，主机修改内容如下:
! Configuration File for keepalived
global_defs {
notification_email {
test@localhost.com
}
notification_email_from localhost@localhost.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.50
}
}
从配置如下：
! Configuration File for keepalived
global_defs {
notification_email {
test@localhost.com
}
notification_email_from localhost@localhost.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.50
}
}
启动主从的keepalived：
在主从上分布执行：
[@server_150 ~]# keepalived start
[@server_150 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:66:44:2a brd ff:ff:ff:ff:ff:ff
inet 192.168.0.150/24 brd 10.10.79.255 scope global eth0
inet 192.168.0.50/32 scope global eth0
inet6 fe80::7a2b:cbff:fe66:442a/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:66:44:2c brd ff:ff:ff:ff:ff:ff
inet 220.181.26.82/24 brd 220.181.26.255 scope global eth1
inet6 fe80::7a2b:cbff:fe66:442c/64 scope link
valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 78:2b:cb:66:44:2e brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 78:2b:cb:66:44:30 brd ff:ff:ff:ff:ff:ff
6: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
从机：
[@server_157 ~]# keepalived start
[@server_157 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:65:7f:9f brd ff:ff:ff:ff:ff:ff
inet 192.168.0.157/24 brd 10.10.79.255 scope global eth0
inet6 fe80::7a2b:cbff:fe65:7f9f/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:65:7f:a1 brd ff:ff:ff:ff:ff:ff
inet 220.181.26.92/24 brd 220.181.26.255 scope global eth1
inet6 fe80::7a2b:cbff:fe65:7fa1/64 scope link
valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 78:2b:cb:65:7f:a3 brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 78:2b:cb:65:7f:a5 brd ff:ff:ff:ff:ff:ff
6: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
现在停止从机的keepalived服务，再次查看主从ip addr，与上面的结果一样。
启动从机的keepalived服务，然后停止主机的keepalived服务。
再次查看主从的ip addr
主机：
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:66:44:2a brd ff:ff:ff:ff:ff:ff
inet 192.168.0.150/24 brd 10.10.79.255 scope global eth0
inet6 fe80::7a2b:cbff:fe66:442a/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:66:44:2c brd ff:ff:ff:ff:ff:ff
inet 220.181.26.82/24 brd 220.181.26.255 scope global eth1
inet6 fe80::7a2b:cbff:fe66:442c/64 scope link
valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 78:2b:cb:66:44:2e brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 78:2b:cb:66:44:30 brd ff:ff:ff:ff:ff:ff
6: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
从机：
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 78:2b:cb:65:7f:9f brd ff:ff:ff:ff:ff:ff
inet 192.168.0.157/24 brd 10.10.79.255 scope global eth0
&nbs
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