Linux load balancer software lvs-Direct use of LVS

4. Installation Configuration LVS4.1 Preparation work

Address planning:

Server name	IP Address	Gateway	Virtual device Name	Virtual IP
Director Server	192.168.98.75	192.168.98.1	eth0:0	192.168.98.77
Real Server 1	192.168.98.74	192.168.98.1	lo:0	192.168.98.77
Real Server 2	192.168.98.117	192.168.98.1	lo:0	192.168.98.77
Real Server N	...	...	..	..

4.2 Installing the LVS

The implementation of the LVS is done by ipvsadm this program, so to determine whether a system has Ipvs function, only need to see if the IPVSADM program is installed. The simplest way to view the IPVSADM program is to execute command ipvsadm on any path. The following table compares the output of the installation Ipvsadm and the Ipvsadm that are not installed.

	Output after execution of Ipvsadm
Ipvsadm not installed	-bash:ipvsadm:command not Foun
Installing Ipvsadm	IP Virtual Server version 1.2.1 (size=4096) Prot Localaddress:port Scheduler Flags ->remoteaddress:port Forward Weight activeconn inactconn

* all director servers need to install Ipvsadm,real server only to execute the configuration script.

1. Create a connection file whose command is:

[Email protected] ~]# ln–sv/usr/src/kernels/2.6.18-308.el5-x86_64//usr/src/linux

Note Be sure to conform to the current running kernel because there are multiple directories under the/usr/src/kernels directory. If you do not create this connection file, errors will occur at compile time, so you cannot proceed with the installation.

2. Unzip the ipvsadm-1.24.tar.gz package:

[Email protected] ~]# tar zxvf ipvsadm-1.24.tar.gz

3. Compiling the installation

[Email protected] ~]# CD ipvsadm-1.24

[[email protected] ~]# make

[[email protected] ~]# make install

Executable files are installed to/sbin/ipvsadm

L Check if the installation Ipvsadm is properly installed

1. Execute ipvsadm, output as shown in the bottom three of the second column of the table above.

2. Check the currently loaded kernel module to see if the Ip_vs module exists.

[Email protected] ~]# Lsmod|grep Ip_vs

Ip_vs 122112 0

4.3 Configurationand verifying the director Server4.3.1 Configuring the Director Server

#!/bin/bash vip=192.168.98.77 #虚拟ip (IP for user access) rip1=192.168.98.74 # Real server IP rip2=192.168.98.117 #真实服务器 (real server) IP port=2200 #端口 Case "$" in Start) echo "start config LVS Director Server ..." ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 Up Route add-host $VIP Dev eth0:0 echo "1" >/proc/sys/net/ipv4/ip_forward Ipvsadm-c Ipvsadm-a-T $VIP: $PORT-S RR + Ipvsadm-a-T $VIP: $PORT-R $RIP 1: $PORT –g #添加real Server, multiple configurable multiple Ipvsadm- A-t $VIP: $PORT-R $RIP 2: $PORT –g #添加real Server, multiple configurable multiple Ipvsadm echo "config LVS Director server success!" ;; Stop) echo "Shut down LVS Director Server" Echo "0" >/proc/sys/net/ipv4/ip_forward Ipvsadm-c Ifconfig eth0:0 down Echo shut down LVS Director Server success! ;; *) Echo "usage:$0 {start|stop}" Exit 1 Esac

Execute:./lvsdr.sh Start Open

Execute:./lvsdr.sh Stop off

* Modify permissions before executing: chmod 755 lvsdr.sh

4.3.2 Verifying the Director server configuration

[Email protected] lvs]# Ipvsadm IP Virtual Server version 1.2.1 (size=4096) Prot Localaddress:port Scheduler Flags Remoteaddress:port Forward Weight activeconn inactconn TCP 192.168.98.77:2200 WLC -192.168.98.117:2200 Route 1 0 0 -192.168.98.74:2200 Route 1 0 0

The output of the above information is configured successfully.

4.3.3 Configuring Ipvsadm as a boot startup script

LvsDR_auto.sh:Director Server Configuration Script

Where Vip,rip1,rip2,port should be modified according to actual needs

#!/bin/bash vip=192.168.98.77 #虚拟ip (IP for user access) rip1=192.168.98.74 #Real Server IP rip2=192.168.98.117 #Real Server IP port=2200 #端口 echo "start config LVS Director Server ..." Ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 up Route add-host $VIP Dev eth0:0 echo "1" >/proc/sys/net/ipv4/ip_forward Ipvsadm-c Ipvsadm-a-T $VIP: $PORT-S WLC Ipvsadm-a-T $VIP: $PORT-R $RIP 1: $PORT-G Ipvsadm-a-T $VIP: $PORT-R $RIP 2: $PORT-G Ipvsadm echo "config LVS Director Server success!" Exit 1

LvsRS_auto.sh:Real Server Configuration Script

Where the VIP should be the same as the VIP configured by the Director server

#!/bin/bash vip=192.168.98.77 #虚拟ip (IP for user access) echo "start config LVs Real Server ..." Ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up Route add-host $VIP Dev lo:0 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce echo "config LVs Real Server success!" Exit 1

First the script file is placed on the server and you need to add Execute permissions:

[Email protected] ~]# chmod 755 lvsdr_auto.sh

[Email protected] ~]# chmod 755 lvsrs_auto.sh

Director Server :

[email protected] ~]# CP lvsdr_auto.sh/etc/init.d/

[Email protected] ~]# ln-s/etc/init.d/lvsdr_auto.sh/etc/rc.d/rc3.d/s99lvsdr_auto

[Email protected] ~]# ln-s/etc/init.d/lvsdr_auto.sh/etc/rc.d/rc5.d/s99lvsdr_auto

Real Server :

[email protected] ~]# CP lvsrs_auto.sh/etc/init.d/

[Email protected] ~]# ln-s/etc/init.d/lvsrs_auto.sh/etc/rc.d/rc3.d/s99lvsrs_auto

[Email protected] ~]# ln-s/etc/init.d/lvsrs_auto.sh/etc/rc.d/rc5.d/s99lvsrs_auto

4.4 Configuring and verifying real Server4.4.1 configuration real Server

#!/bin/bash vip=192.168.98.77 #虚拟ip (IP for user access) Case "$" in Start echo "start config LVs Real Server ..." Ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up Route add-host $VIP Dev lo:0 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce echo "config LVs Real Server success!" ;; Stop echo "Shutting down LVS Real server ..." Ifconfig lo:0 Down echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce echo "Shut down LVS Real server success!" ;; *) echo "usage:$0 {start|stop}" Exit 1 Esac

Execute:./lvsrs.sh Start Open

Execute:./lvsrs.sh Stop off

* Modify permissions before executing: chmod 755 lvsrs.sh

4.4.2 VerificationRESL Server Configuration

[[Email protected] ~]# IP add 1:lo: <LOOPBACK,UP,LOWER_UP> MTU 16436 Qdisc noqueue 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 192.168.98.77/32 BRD 192.168.98.77 Scope Global lo:0 INET6:: 1/128 Scope Host Valid_lft Forever Preferred_lft Forever 2:eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> MTU Qdisc pfifo_fast Qlen 1000 Link/ether 00:50:56:91:14:81 BRD FF:FF:FF:FF:FF:FF inet 192.168.98.118/24 BRD 192.168.98.255 Scope Global eth0 Inet6 FE80::250:56FF:FE91:1481/64 Scope link Valid_lft Forever Preferred_lft Forever 3:sit0: <NOARP> MTU 1480 Qdisc NoOp Link/sit 0.0.0.0 BRD 0.0.0.0

As can be seen from the output, lo0:0 The VIP address we specified is indeed bound.

Filed under: http://www.cnblogs.com/llhua/p/4195337.html

Linux load balancer software lvs-Direct use of LVS