1、基于 CentOS 7 构建 LVS-DR 群集。 2、配置nginx负载均衡

一、基于CentOS7和、构建LVS-DR群集

准备四台虚拟机

ip	作用
192.168.27.150	客户端
192.168.27.151	LVS
192.168.27.152	RS
192.168.27.152	RS

关闭防火墙

[root@localhost ~]# systemctl stop firewalld

安装ifconfig

yum install net-tools.x86_64 -y

1、DS上

1.1 配置LVS虚拟IP

安装ipvsadm
yum install ipvsadm -y
 
增加IP
ifconfig ens33:200 192.168.27.200 netmask 255.255.255.255 up

1.2 手工执行配置添加LVS服务并增加两天RS

[root@localhost ~]# ipvsadm -C
[root@localhost ~]# ipvsadm -A -t 192.168.27.200:80 -s rr
[root@localhost ~]# ipvsadm -a -t 192.168.27.200:80 -r 192.168.27.151:80 -g
[root@localhost ~]# ipvsadm -a -t 192.168.27.200:80 -r 192.168.27.152:80 -g

2、在RS端（第三、四台）上

2.1 配置WEB服务器

yum install httpd -y

2.2 配置默认主页

hostname -I 取地址
 
[root@backup ~]# echo "web test page, ip is `hostname -I`." > /var/www/html/index.html

2.3 启动服务

[root@backup ~]# systemctl start httpd

2.4 测试：在客户端访问WEB服务器

[root@localhost ~]# curl 192.168.27.147
web test page, ip is 192.168.27.147 .
[root@localhost ~]# curl 192.168.27.148
web test page, ip is 192.168.27.148 .

2.5 绑定VIP

ifconfig lo:200 192.168.27.200 netmask 255.255.255.255 up

2.6 配置主机路由

route add -host 192.168.27.200 dev lo

2.7 抑制ARP响应

调整内核参数，关闭arp响应
 
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

二、配置nginx负载均衡
环境准备

主机名 ip地址        作用
node1 192.168.27.140 负载均衡服务器
node2 192.168.27.141 Web服务器
node3 192.168.27.142 Web服务器

配置
1、配置主机文件vhost.conf

[root@node1 ~]# vim /etc/nginx/conf.d/vhost.conf
	upstream web_pools {
      server 192.168.27.141:80;
      server 192.168.27.142:80;
	}
	server {
      listen 80;
      server_name www1.ming.com;
 
      location / {
        proxy_pass http://web_pools;
      }
}
解释：proxy_pass 是反向代理

2、检查语法并重启服务

#检查语法是否正确
[root@node1 ~]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

#重启服务
[root@node1 ~]# systemctl restart nginx

3、配置hosts文件

#在linux中修改
[root@node1 ~]# vim /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.27.140 www1.ming.com
#测试
[root@node1 ~]# for((i=1;i<=4;i++))
> do
> curl www1.ming.com
> done
web test page,ip is 192.168.27.141 
web test page ,ip is 192.168.27.142 
web test page,ip is 192.168.27.141 
web test page ,ip is 192.168.27.142