global_defs {
router_id TENGINE_HA_MASTER
}
#vrrp_script check_run {
# script "/root/bin/nginx_check.sh"
# interval 5
#}
vrrp_instance V_1 {
state BACKUP
interface eth0
virtual_router_id 55
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass caikR2015
}
# track_script {
# check_run
# }
virtual_ipaddress {
172.31.100.55
}
# notify_master "script"
# 变为master后执行脚本
# notify_backup "script"
# 变为backup后执行脚本
}
#########################################################
global_defs {
router_id TENGINE_HA_BACKUP
}
vrrp_instance V_1 {
state BACKUP
nopreempt
####################
interface eth0
virtual_router_id 55
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass caikR2015
}
virtual_ipaddress {
172.31.100.55
}
}
#######################################################################################
1,在主备机器上安装keepalived，
步骤如下:下载keepalived-1.1.15.tar.gz，然后解压安装
#tar zxvf keepalived-1.1.15.tar.gz
#cd keepalived-1.1.15
#./configure
#make
#make install
2,配置keepalived
配置中的state MASTER决定了节点为主节点
priority决定了优先级，比如在有多个备用节点的时候，主节点故障后优先级值大的接管。
主节点的配置如下:
global_defs {
router_id NodeA
}
vrrp_instance VI_1 {
state MASTER #设置为主服务器
interface eth0 #监测网络接口
virtual_router_id 51 #主、备必须一样
priority 100 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式，主备必须一致
auth_pass 1111 #(密码)
}
virtual_ipaddress {
192.168.8.100/24 #VRRP HA虚拟地址
}
备用节点的配置如下:
global_defs {
router_id NodeB
}
vrrp_instance VI_1 {
state BACKUP #设置为主服务器
interface eth0 #监测网络接口
virtual_router_id 51 #主、备必须一样
priority 90 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式，主备必须一致
auth_pass 1111 #(密码)
}
virtual_ipaddress {
192.168.8.100/24 #VRRP HA虚拟地址
}
3,启动keepalived:
keepalived -D -f /usr/local/etc/keepalived/keepalived.conf
查看log消息:
tail -f /var/log/messages
启动主节点A后的日志为:会广播ARP消息:
[root@srv4 ~]# tail -f /var/log/messages
Sep 20 01:45:29 srv4 Keepalived_vrrp: Configuration is using : 34546 Bytes
Sep 20 01:45:29 srv4 Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(8,9)]
Sep 20 01:45:30 srv4 Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Sep 20 01:45:31 srv4 Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Sep 20 01:45:31 srv4 Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
Sep 20 01:45:31 srv4 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.8.100
Sep 20 01:45:31 srv4 Keepalived_vrrp: Netlink reflector reports IP 192.168.8.100 added
Sep 20 01:45:31 srv4 Keepalived_healthcheckers: Netlink reflector reports IP 192.168.8.100 added
Sep 20 01:45:31 srv4 avahi-daemon[4029]: Registering new address record for 192.168.8.100 on eth0.
Sep 20 01:45:36 srv4 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.8.100
通过ip a 命令可以看到192.168.8.100/24绑定到了eth0上
[root@srv4 bin]# ip a
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 00:0c:29:50:2d:9d brd ff:ff:ff:ff:ff:ff
inet 192.168.8.4/24 brd 192.168.8.255 scope global eth0
inet 192.168.8.100/24 scope global secondary eth0
inet6 fe80::20c:29ff:fe50:2d9d/64 scope link
valid_lft forever preferred_lft forever
启动备用节点B后的日志为:
Sep 20 01:47:31 hadoopsrv Keepalived_vrrp: Configuration is using : 34262 Bytes
Sep 20 01:47:31 hadoopsrv Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE
Sep 20 01:47:31 hadoopsrv Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(7,8)]
Sep 20 01:47:31 hadoopsrv Keepalived: Starting VRRP child process, pid=20567