# yum install -y keepalived
# chkconfig keepalived on
# echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf
# sysctl -p
例 126.2. /etc/keepalived/keepalived.conf
Master
vrrp_script chk_haproxy {
script "killall -0 haproxy" # verify the pid existance
interval 2 # check every 2 seconds
weight 2 # add 2 points of prio if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state MASTER
virtual_router_id 51 # Assign one ID for this route
priority 101 # 101 on master, 100 on backup
virtual_ipaddress {
192.168.10.100 # the virtual IP
}
track_script {
chk_haproxy
}
}
Slave
vrrp_script chk_haproxy {
script "killall -0 haproxy" # verify the pid existance
interval 2 # check every 2 seconds
weight 2 # add 2 points of prio if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state MASTER
virtual_router_id 51 # Assign one ID for this route
priority 100 # 101 on master, 100 on backup
virtual_ipaddress {
192.168.10.100 # the virtual IP
}
track_script {
chk_haproxy
}
}
启动keepalived
/etc/init.d/keepalived start
检查IP地址与主从状态
SLB1 IP:
$ ip a | grep -e inet.*eth0
inet 192.168.10.101/24 brd 192.168.10.255 scope global eth0
inet 192.168.10.100/32 scope global eth0
LB1 Keepalived state:
$ cat /var/log/messages | grep VRRP_Instance
Apr 19 15:47:25 lb1 Keepalived_vrrp[6146]: VRRP_Instance(VI_1) Transition to MASTER STATE
Apr 19 15:47:25 lb1 Keepalived_vrrp[6146]: VRRP_Instance(VI_1) Entering MASTER STATE
SLB2 IP:
$ ip a | grep -e inet.*eth0
inet 192.168.10.102/24 brd 192.168.10.255 scope global eth0
LB2 Keepalived state:
$ cat /var/log/messages | grep VRRP_Instance
Apr 19 15:47:25 lb2 Keepalived_vrrp[6146]: VRRP_Instance(VI_1) Transition to MASTER STATE
Apr 19 15:47:25 lb2 Keepalived_vrrp[6146]: VRRP_Instance(VI_1) Received higher prio advert
Apr 19 15:47:25 lb2 Keepalived_vrrp[6146]: VRRP_Instance(VI_1) Entering BACKUP STATE
原文出处：Netkiller 系列 手札
本文作者：陈景峯
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