上一篇文档写的是LVS（DR）+ Keepalived实现高性能高可用负载均衡服务器(见 )，这次主要写的是基于LVS（NAT）+ Keepalived实现高性能高可用负载均衡服务器。
其实NAT模式在企业用的不多，我和很多朋友都沟通过这个事情，我们搭建这个环节主要是测试一下整个性能与DR的具体的差距。但是在搭建这个环境过程中遇到一点小问题，就是内网的VIP不知道如何去设置，这个问题困扰了我很长时间，因为LVS也只是刚刚接触，期间给我一个之前的学员电话他给我提供了一个方法，昨天晚上回去测试OK~！今天上午在线上也测试了，没有问题。以后要继续努力~！朝着我的目标前进~！同时希望各位在参考时遇到什么问题和我及时沟通，以便更好的完善文档！~
软件下载：见
keepalived：keepalived-1.2.2.tar.gz
ipvsadm: ipvsadm-1.26.tar.gz 注意：(for kernel 2.6.28-rc3 or later)
popt-static：popt-static-1.13-7.el6.x86_64.rpm
实验拓扑图
1、在2台Director Server上分别配置LVS+Keepalived
[root@host1 ~]# rpm -ivh popt-static-1.13-7.el6.x86_64.rpm
#看我前一篇文章
[root@host1 ~]# yum -y install kernel-devel make gcc openssl-devel lftp libnl* popt*
[root@host1 ~]# ln -s /usr/src/kernels/2.6.18-194.el5-x86_64/ /usr/src/linux
[root@host1 ~]# tar -zxvf ipvsadm-1.26.tar.gz -C /usr/src/
[root@host1 ~]# cd /usr/src/ipvsadm-1.26/
[root@host1 ipvsadm-1.26]# make
[root@host1 ipvsadm-1.26]# make install
[root@host1 ~]# tar -zxvf keepalived-1.2.2.tar.gz -C /usr/src/
[root@host1 ~]# cd /usr/src/keepalived-1.2.2/
[root@host1 keepalived-1.2.2]# ./configure
[root@host1 keepalived-1.2.2]# make
[root@host1 keepalived-1.2.2]# make install
[root@host1 keepalived-1.2.2]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[root@host1 keepalived-1.2.2]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@host1 keepalived-1.2.2]# mkdir /etc/keepalived
[root@host1 keepalived-1.2.2]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[root@host1 keepalived-1.2.2]# cp /usr/local/sbin/keepalived /usr/sbin/
2 、开启路由转发
[root@host1 ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@host1 ~]# sysctl -p
3、配置Keepalived
[root@host1 ~]# less /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id LVS_MASTER #备上修改LVS_BACKUP } vrrp_instance VI_1 { state MASTER #备上修改BACKUP interface eth0 virtual_router_id 51 priority 100 #备上修改80 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.10 } } vrrp_instance LAN_GATEWAY { state MASTER #备上修改BACKUP interface eth1 virtual_router_id 52 priority 100 #备上修改80 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.10.10 } } virtual_server 10.0.0.10 80 { delay_loop 6 lb_algo rr lb_kind NAT # nat_mask 255.255.255.0 # persistence_timeout 50 protocol TCP real_server 192.168.10.3 80 { weight 1 TCP_CHECK { connect_timeout 10 nb_get_retry 3 connect_port 80 } } real_server 192.168.10.4 80 { weight 1 TCP_CHECK { connect_timeout 10 nb_get_retry 3 connect_port 80 } } }