hncys 发表于 2019-1-1 07:46:26

CentOS6.2下搭建LVS(NAT)+Keepalived实现高性能高可用负载均衡服务

　　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，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：
　　
keepalived：http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
　　
ipvsadm: http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz 注意：(for kernel 2.6.28-rc3 or later)
　　
popt-static：http://mirror.centos.org/centos/6/os/x86_64/Packages/popt-static-1.13-7.el6.x86_64.rpm
　　

　　实验拓扑图
　　
http://img1.运维网.com/attachment/201203/224120924.jpg
　　
1、在2台Director Server上分别配置LVS+Keepalived
　　
# rpm -ivh popt-static-1.13-7.el6.x86_64.rpm
　　
#看我前一篇文章http://crazylinux.blog.运维网.com/259244/811591
　　
# yum -y install kernel-devel make gcc openssl-devel lftp libnl* popt*
　　
# ln -s /usr/src/kernels/2.6.18-194.el5-x86_64/ /usr/src/linux
　　
# tar -zxvf ipvsadm-1.26.tar.gz -C /usr/src/
　　
# cd /usr/src/ipvsadm-1.26/
　　
# make
　　
# make install
　　
# tar -zxvf keepalived-1.2.2.tar.gz -C /usr/src/
　　
# cd /usr/src/keepalived-1.2.2/
　　
# ./configure
　　
# make
　　
# make install
　　
# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
　　
# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
　　
# mkdir /etc/keepalived
　　
# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
　　
# cp /usr/local/sbin/keepalived /usr/sbin/
　　
2 、开启路由转发
　　
# vim /etc/sysctl.conf
　　
net.ipv4.ip_forward = 1
　　
# sysctl -p
　　
3、配置Keepalived
　　
# 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
[*]      }
[*]    }
[*]}
　　

　　BACKUP服务器同上配置，先安装lvs再按装keepalived,然后配置/etc/keepalived/keepalived.conf，只需将批注部分改一下即可。
　　
4、分别在2台Real Server上面设置网关
　　
把网关都设置成：192.168.10.10
　　
5、在2台RealServer中分别配置HTTP
　　
# yum -y install httpd
　　
# cd /var/www/html/
　　
# cat index.html
　　
< h1>RealServer for 192.168.10.3
　　
# /etc/init.d/httpd start
　　
另一台机器配置一样，过程略、、、
　　
6、测试：
　　
分别启动Keepalived
　　
# chkconfig keepalived on
　　
# /etc/init.d/keepalived restart
　　
# ipvsadm -ln
　　
IP Virtual Server version 1.2.1 (size=4096)
　　
Prot LocalAddress:Port Scheduler Flags
　　
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
　　
TCP 10.0.0.10:80 rr
　　
-> 192.168.10.3:80 Masq 1 0 0
　　
-> 192.168.10.4:80 Masq 1 0 0
　　
先关闭LVS_Master的Keepalived，观察LVS_Backup的日志
　　
# tailf /var/log/messages
　　
Mar 22 22:39:16 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Transition to MASTER STATE
　　
Mar 22 22:39:16 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Entering MASTER STATE
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) setting protocol VIPs.
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Sending gratuitous ARPs on eth1 for 192.168.10.10
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.0.0.10
　　
Mar 22 22:39:17 host2 Keepalived_healthcheckers: Netlink reflector reports IP 192.168.10.10 added
　　
Mar 22 22:39:17 host2 Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.10 added
　　
Mar 22 22:39:22 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Sending gratuitous ARPs on eth1 for 192.168.10.10
　　
Mar 22 22:39:22 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.0.0.10
　　
在测试机上访问：
　　
在2台RealServer中分别配置HTTP
　　
# yum -y install httpd
　　
# cd /var/www/html/
　　
# cat index.html
　　
< h1>RealServer for 192.168.10.3
　　
# /etc/init.d/httpd start
　　
另一台机器配置一样，过程略、、、
　　
7、测试：
　　
分别启动Keepalived
　　
# chkconfig keepalived on
　　
# /etc/init.d/keepalived restart
　　
# ipvsadm -ln
　　
IP Virtual Server version 1.2.1 (size=4096)
　　
Prot LocalAddress:Port Scheduler Flags
　　
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
　　
TCP 10.0.0.10:80 rr
　　
-> 192.168.10.3:80 Masq 1 0 0
　　
-> 192.168.10.4:80 Masq 1 0 0
　　
先关闭LVS_Master的Keepalived，观察LVS_Backup的日志
　　
# tailf /var/log/messages
　　
Mar 22 22:39:16 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Transition to MASTER STATE
　　
Mar 22 22:39:16 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Entering MASTER STATE
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) setting protocol VIPs.
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Sending gratuitous ARPs on eth1 for 192.168.10.10
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
　　
Mar 22 22:39:17 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.0.0.10
　　
Mar 22 22:39:17 host2 Keepalived_healthcheckers: Netlink reflector reports IP 192.168.10.10 added
　　
Mar 22 22:39:17 host2 Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.10 added
　　
Mar 22 22:39:22 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Sending gratuitous ARPs on eth1 for 192.168.10.10
　　
Mar 22 22:39:22 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.0.0.10
　　
在测试机上访问：
　　
http://img1.运维网.com/attachment/201203/150100231.jpg
　　启动LVS_Master，在查看LVS_Backup日志
　　
# tailf /var/log/messages
　　
Mar 22 22:51:50 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Received higher prio advert
　　
Mar 22 22:51:50 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) Entering BACKUP STATE
　　
Mar 22 22:51:50 host2 Keepalived_vrrp: VRRP_Instance(LAN_GATEWAY) removing protocol VIPs.
　　
Mar 22 22:51:50 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advert
　　
Mar 22 22:51:50 host2 Keepalived_healthcheckers: Netlink reflector reports IP 192.168.10.10 removed
　　
Mar 22 22:51:50 host2 Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE
　　
Mar 22 22:51:50 host2 Keepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.
　　
Mar 22 22:51:50 host2 Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.10 removed
　　
一切访问正常~！
　　本文出自 “CrazyLinux工作室” 博客，请务必保留此出处http://crazylinux.blog.运维网.com/259244/813154


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