LVS产生背景、原理及LVS-DR应用实例（二）

六、LVS-DR应用实例

（一）基本构建思路：

Director: 通过Director实现访问调度到RS1，RS2，实现负载均衡，RS3负责动态分离。

基本拓扑图如下：

（二）实现方法：

1) 设置nfs 共享目录, /data/wwwroot/wordpress/

yum install -y nfs-utils

service rpcbind start

service nfs start

mkdir -pv /data/wordpress/

useradd -M -r -s /sbin/nologin -u 3307 www

chown www:www /data/wwwroot/wordpress/

vim /etc/exports
/data/wordpress/ 181.163.10.0/24(rw,no_root_squash)

2）将wordpress安装包解压到此目录,并安装PHP，mariadb，修改权限和相应配置

修改共享文件目录及文件权限

chown -R www:www /data/wwwroot/wordpress/

php-fpm.conf 配置修改

listen = 9000 #监听 9000 端口
listen.allowed_clients = 181.163.10.9，181.163.10.10,127.0.0.1 #允许IP

建立数据库

mysqladmin -u root -p create dbase_wordpress_01；

use dbase_wordpress_01;

mysql> GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP
    -> ON dbase_wordpress_01.*
    -> TO 'localhost'
    -> IDENTIFIED BY 'root';
Query OK, 0 rows affected (0.00 sec)

3)RS1 RS2 设置vip 及lo

echo "0">/proc/sys/net/ipv4/ip_forward

              echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
              echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
              echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
              echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
             ifconfig lo:0 $vip netmask 255.255.255.255 broadcast $vip
             route add -host $vip dev lo:0

执行脚本完成LVS_Realserver.sh ,RS1结果如下

               lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet 181.163.11.254/0 scope global lo:0:1
    inet 181.163.11.254/32 brd 181.163.11.254 scope global lo:0
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever

4）挂载共享目录

mount -t nfs 181.163.10.11:/data/wwwroot/wordpress/ /data/wwwroot/wordpress/

5) 修改 nginx.conf 文件

root /data/wwwroot/wordpress/;

fastcgi_pass 181.163.10.11:9000;

6）Director 设置

yum install ipvsadm -y

ipvsadm -A -t $VIP:80 -s rr -p 120

ipvsadm -a -t $VIP:80 -r $RIP1:80 -g

ipvsadm -a -t $VIP:80 -r $RIP2:80 -g

echo "0">/proc/sys/net/ipv4/ip_forward

ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 up

route add -host $VIP dev eth0:0

运行脚本完成添加集群服务及集群节点:LVS_Director.sh

查看结果： ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP 181.163.11.254:80 rr persistent 120
-> 181.163.11.2:80              Route   1      0          0
-> 181.163.11.3:80              Route   1      0          0

（三）、结果截图