基于 CentOS 7 构建 LVS-DR 集群 及 配置nginx负载均衡

一、构建LVS-DR集群

1、主机规划

Node01：PC

Node02：LVS

Node03、Node04：Webserver

2、部署环境

2.1 在Node02上配置

2.1.1 安装ipvsadm管理软件按

[root@localhost ~]# yum install -y ipvsadm

2.1.2 配置VIP

[root@localhost ~]# ifconfig ens33:200 192.168.100.200 netmask 255.255.255.255

[root@localhost ~]# ip ad
ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    inet 192.168.100.200/32 brd 192.168.100.255 scope global secondary ens33:200
       valid_lft forever preferred_lft forever
    

2.2 在Node03上配置

2.2.1 安装Apache服务

[root@localhost ~]# yum install -y httpd

2.2.2 编辑默认主页

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

[root@localhost ~]# systemctl start httpd.service

2.3 在Node04配置

2.3.1 安装Apache服务

[root@localhost ~]# yum install -y httpd

2.3.2 编辑默认主页

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

[root@localhost ~]# systemctl start httpd.service

2.4 在Node01上测试

[root@localhost ~]# curl 192.168.100.5
Web test page, ip is 192.168.100.5 .

[root@localhost ~]# curl 192.168.100.6
Web test page, ip is 192.168.100.6 .

3、绑定VIP

3.1 在Node03上配置

[root@localhost ~]# ifconfig lo:200 192.168.100.200 netmask 255.255.255.255 up

[root@localhost ~]# route add -host 192.168.100.200 dev lo

3.2 在Node04行配置

[root@localhost ~]# ifconfig lo:200 192.168.100.200 netmask 255.255.255.255 up

[root@localhost ~]# route add -host 192.168.100.200 dev lo

4、ARP抑制

4.1 在Node03上配置

[root@localhost ~]# echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@localhost ~]# echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@localhost ~]# echo "1" > /proc/sys/net/ipv4/conf/ens33/arp_ignore
[root@localhost ~]# echo "2" > /proc/sys/net/ipv4/conf/ens33/arp_announce

4.2 在Node04行配置

[root@localhost ~]# echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@localhost ~]# echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@localhost ~]# echo "1" > /proc/sys/net/ipv4/conf/ens33/arp_ignore
[root@localhost ~]# echo "2" > /proc/sys/net/ipv4/conf/ens33/arp_announce

5、在LVS（Node02）上添加RS

[root@localhost ~]# ipvsadm -A -t 192.168.100.200:80 -s rr

[root@localhost ~]# ipvsadm -a -t 192.168.100.200:80 -r 192.168.100.5:80 -g

[root@localhost ~]# ipvsadm -a -t 192.168.100.200:80 -r 192.168.100.6:80 -g

6、在PC（Node01）上进行测试

[root@localhost ~]# for ((i=1;i<=6;i++)); do curl 192.168.100.200; done

Web test page, ip is 192.168.100.6 .
Web test page, ip is 192.168.100.5 .
Web test page, ip is 192.168.100.6 .
Web test page, ip is 192.168.100.5 .
Web test page, ip is 192.168.100.6 .
Web test page, ip is 192.168.100.5 .

二、配置nginx负载均衡

1、部署环境

1.1 在Node03上配置

[root@localhost ~]# yum install -y httpd

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

1.2 在Node04上配置

[root@localhost ~]# yum install -y httpd

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

2、Node02 配置虚拟主机

2.1 编辑配置文件

[root@localhost ~]# cd /etc/nginx/conf.d/

[root@localhost conf.d]# vim vhost.conf
server{
  listen 80;
  server_name www1.openlab.cn;

  location / {
    proxy_pass http://192.168.100.5;
  }
}

server{
  listen 80;
  server_name www2.openlab.cn;

  location / {
    proxy_pass http://192.168.100.6;
  }
}

[root@localhost conf.d]# vim lb.conf
upstream www_pools {
  server 192.168.100.5:80 weight=1;
  server 192.168.100.6:80 weight=2;
}

server {
  listen 80:
  server_name www.yunjisun.com;

  location / {
  proxy_pass http://www_server_pools;
  }
}

2.2 启动nginx

[root@localhost ~]# systemctl start nginx

3、PC端（Node01）测试

[root@localhost ~]# for ((i=1;i<=9;i++)); do curl http://www.yunjisuan.com; done