部署lvs+keepalived
1.总共需要四台机器，五个ip, 两台机器作为负载均衡director，两台机器作为real server, 一人ip作为虚拟ip,供外网用。2.部署director master:
a. 安装keepalived：yum install keepalived
b.安装ipvs: yum install ipvsadm
c.配置keepalived:
cd /etc/keepalived/
vi keepalived.conf
内容如下：
! Configuration File for keepalived
vrrp_instance VI_1 {
state MASTER
interface eth1
virtual_router_id 46
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass kevin_kocla
}
virtual_ipaddress {
192.168.77.142
}
}
virtual_server 192.168.77.142 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 3600
protocol TCP
real_server 192.168.77.42 80 {
weight 1
TCP_CHECK {
connect_timeout 30
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.77.44 80 {
weight 2
TCP_CHECK {
connect_timeout 30
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
其中192.168.77.142为虚拟ip.
3.部署director backup:
方法同2，整个配置文件拷过来修改，配置文件中
state MASTER 改为：state BACKUP
priority 100 改为：priority 80
4.部署real server, 在/etc/init.d目录下增加lvsrs文件，并赋予755权限，lvsrs内容如下：
#!/bin/bash
#description : Start Real Server
VIP=192.168.77.142
. /etc/rc.d/init.d/functions
case "$1" in
start)
echo " Start LVS of Real Server "
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Director server"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
注意在windows环境下编辑，在linux上有可以不能执行。
5. 部署另一台 real server.
6. 依次启动：
director master: service keepalived start
director backup: service keepalived start
real server 1 : service lvsrs start
rela server 2: service lvsrs start
7.测试访问。
可能用到命令：
ip add
ip add list
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