LVS安装指南：负载均衡与F5替代方案详解

Linux LVS

                                 LVS-NAT            LVS-Tun                   LVS-DR
realserver OS     any              must tunnel                     most
realserver mods           none            tunl must not arp      lo must not arp
port remapping           yes                   no  no
realserver network   private             on internet                     local
(remote or local) -
realserver number       low                  high                            high
client connnects to     VIP                   VIP                              VIP
realserver default gw  director        own router                own router
 
 安装LVS软件
 1.挂载ＲＨＥＬ５光盘
 　#mount /dev/disk/by-label/RH* /cdrom
 2.进入目录
    #cd /cdrom/Cluster
 3.安装软件
   #rpm -ihv ipvsadm-1.24.10.1.i386.rpm
   #rpm -ihv piranha-0.8.4-13.el5.i386.rpm
  4.检查是否允许ipv4包转发
     #sysctl -a | grep ip_forward 
     net.ipv4.ip_forward = 0
     #cp /etc/sysctl.conf  /etc/sysctl.conf.bak
     #vi /etc/sysctl.conf
     net.ipv4.ip_forward = 1        #把此值修改为1
   5.重启系统以使修改的参数生效
    #shutdown -r  now   
   6.确认修改的参数已生效
#sysctl -a | grep ip_forward 

7.检查LVS router 网络参数（ip，netmask，gateway是否正确）
#ifconfig | grep inet
#more /etc/sysconfig/network-scripts/ifcfg-eth0
#more /etc/sysconfig/network-scripts/ifcfg-eth1
8.检查所有real server的网络参数（ip，netmask，gateway是否正确）
#ifconfig | grep inet
#more /etc/sysconfig/network-scripts/ifcfg-eth0
#more /etc/sysconfig/network-scripts/ifcfg-eth1
9.主LVS router上设置piranha口令
# /usr/sbin/piranha-passwd  
    New Password:  
    Verify:  
    Updating password for user piranha 
10.启动piranha服务
#service piranha-gui start
    # chkconfig piranha-gui on

ifconfig lo:1 10.176.160.20 netmask 255.255.255.255 broadcast 10.176.160.255 up;route add -host 10.176.160.20 dev lo:1;echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore ;echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce ;echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore ;echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
 
 On the LVS routers, there are three services which need to be set to activate at boot time:
• The piranha-gui service (primary node only)
• The pulse service
• The sshd service

It is best to set these services to activate in both runlevel 3 and runlevel 5. To accomplish this using
chkconfig, type the following command for each service:
/sbin/chkconfig --level 35 daemon on
In the above command, replace daemon with the name of the service you are activating. To get a
list of services on the system as well as what runlevel they are set to activate on, issue the following
command: