keepalived 配置，vip 配置
A主机：
! Configuration File for keepalived
global_defs {
router_id mycat
}
vrrp_script chk_haproxy {
script "killall -0 haproxy" #cheaper than pidof
interval 2 #check every 2 seconds
}
vrrp_instance Mycat1 {
state BACKUP
interface eth0
track_interface {
eth0
}
virtual_router_id 150
priority 200
! nopreempt
advert_int 5
authentication {
auth_type PASS
auth_pass test_mycat1
}
virtual_ipaddress {
192.168.1.200/24 brd 192.168.1.255 dev eth0 label eth0:1
}
track_script {
check_haproxy weight=0 #+2 if process is present
}
}
vrrp_instance Mycat2 {
state BACKUP
interface eth0
track_interface {
eth0
}
virtual_router_id 151
priority 100
nopreempt
advert_int 5
authentication {
auth_type PASS
auth_pass test_mycat2
}
virtual_ipaddress {
192.168.1.201/24 brd 192.168.1.255 dev eth0 label eth0:2
}
track_script {
check_haproxy weight=0 #+2 if process is present
}
}
B主机：
! Configuration File for keepalived
global_defs {
router_id mycat
}
vrrp_script chk_haproxy {
script "killall -0 haproxy" #cheaper than pidof
interval 2 #check every 2 seconds
}
vrrp_instance Mycat1 {
state BACKUP
interface eth0
track_interface {
eth0
}
virtual_router_id 150
priority 100
nopreempt
advert_int 5
authentication {
auth_type PASS
auth_pass test_mycat1
}
virtual_ipaddress {
192.168.1.200/24 brd 192.168.1.255 dev eth0 label eth0:1
}
track_script {
check_haproxy weight=0 #+2 if process is present
}
}
vrrp_instance Mycat2 {
state BACKUP
interface eth0
track_interface {
eth0
}
virtual_router_id 151
priority 200
! nopreempt
advert_int 5
authentication {
auth_type PASS
auth_pass test_mycat2
}
virtual_ipaddress {
192.168.1.201/24 brd 192.168.1.255 dev eth0 label eth0:2
}
track_script {
check_haproxy weight=0 #+2 if process is present
}
}
#都存活A为1.200，B为1.201 ； 任一挂了，另一同时为1.200，1.201，两倍工作量；
最后通过DNS将两个IP(A记录)指向相同域名轮询。