一准备环境
在NAT模式下的群集中，LVS负载调度器是所有节点访问internet的网关服务器，其外网地址172.16.11.182同时也作为整个群集的VIP地址。LVS调度器具有两块网卡，分别连接内外网。
LVS调度器作为Web服务器池的网关
使用轮询（rr）调度算法
二、LVS调度器
（-）配置SNAT转发规则
vim /etc/sysctl.conf
net.ipv4.ip_forward = 1 //开启路由转发功能
sysctl -p
iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o eth0 -j SNAT --to-source 172.16.11.182
service iptables save
route -n
配置DNS //这里NDS与调度器在一台主机上
cd /var/named/chroot/var/named/
vim lb.zheng
$TTL 3H
@ IN SOA caomc.com. root.caomc.com. (
2012061701 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS dns.caomc.com.
dns IN A 192.168.10.254
server IN A 192.168.10.254
db1 IN A 192.168.10.23
host1 IN A 192.168.10.22
www IN A 172.16.11.182
service named restart
host www.caomc.com
yum -y install ipvsadm
service ipvsadm stop
ipvsadm -A -t 172.16.11.182:80 -s rr
ipvsadm -a -t 172.16.11.182:80 -r 192.168.10.21:80 -m -w 1
ipvsadm -a -t 172.16.11.182:80 -r 192.168.10.22:80 -m -w 1
ipvsadm -a -t 172.16.11.182:80 -r 192.168.10.28:80 -m -w 1
[root@server ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.16.11.182:80 rr
-> 192.168.10.21:80 Masq 1 0 0
-> 192.168.10.22:80 Masq 1 0 0
-> 192.168.10.28:80 Masq 1 0 0 service ipvsadm save
chkconfig ipvsadm on
三、服务器节点的配置都一样
yum -y install httpd
service httpd restart
yum -y install nfs-utils rpcbind
showmount -e 192.168.10.24
mount 172.16.11.182:/caomc /var/www/html/
四、NFS共享存储
yum -y install nfs-utils rpcbind
vim /etc/exports
/caomc *(rw)
chkconfig nfs on
chkconfig rpcbind on
service rpcbind start
service nfs restart
showmount -e
/caomc *
