keepalived + LVS DR 构建高可用负载均衡

一、环境简述
real server1: 192.168.50.207 -----------httpd服务器
real server2: 192.168.50.235 -----------httpd服务器
director server1:192.168.50.232--------lvs dr服务器+ keepalived服务器
director server2:192.168.50.231 -----lvs dr服务器+ keepalived服务器
测试服务器: 192.168.50.208

二、搭建
1 real server1和real server2服务器设置:
分别执行以下脚本
[ lvs_dir]#cat lvs_dr_rs.sh
#!/bin/bash
vip=192.168.50.252
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip lo:0
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
注: httpd的安装和设置省略，参考前面的博客

1. director server1服务器设置:
   [ keepalived]# cat /etc/keepalived/keepalived.conf
   ! Configuration File for keepalived

global_defs {
notification_email {

vrrp_instance VI_1 {
state MASTER
interface ens160
virtual_router_id 111
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.50.252
}
}

virtual_server 192.168.50.252 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 0
protocol TCP

real_server 192.168.50.235 80 {
    weight 1
    TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

real_server 192.168.50.207 80 {
    weight 1
    TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

}

[[email protected] keepalived]# echo 1 > /proc/sys/net/ipv4/ip_forward

1. director server2的搭建类似
   只需要将keepalived的配置文件中的内容稍作修改
   state MASTER -> state BACKUP
   priority 100 -> priority 90

2. 启动keepalved服务（director server1和director server2）
   [[email protected] keepalived]# systemctl start keepalived

三、测试
1 测试负载均衡(208上):
[[email protected] ~]# curl 192.168.50.252:80
235
[[email protected] ~]# curl 192.168.50.252:80
207
[[email protected] ~]# curl 192.168.50.252:80
235
[[email protected] ~]# curl 192.168.50.252:80
207
2.测试real server的单点故障问题:
关掉235上的httpd服务，然后在208上测试:
[[email protected] ~]# curl 192.168.50.252:80
207
[[email protected] ~]# curl 192.168.50.252:80
207
3.测试director的高可用性
关掉231服务器的keepalived，或者关掉网卡等，再在208上测试
[[email protected] ~]# curl 192.168.50.252:80
235
[[email protected] ~]# curl 192.168.50.252:80
207
[[email protected] ~]# curl 192.168.50.252:80
235
[[email protected] ~]# curl 192.168.50.252:80
207