Lvs-nat implementing a Web server lb cluster

Objective:

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Lvs-nat FLow Chart

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Introduction to the experimental environment

There are three servers, as follows:

Lvs-director : External Network IP 192.168.1.107 Intranet IP 172.16.100.1

lvs-rs1 : IP 172.16.100.8 netmask 255.255.255.0 gateway172.16.100.1

lvs-rs2 : IP 172.16.100.9 netmask 255.255.255.0 gateway172.16.100.1

Note: Three servers are in the same network segment

Experiment Configuration

Configure separately lvs-rs1 , lvs-rs2 to be Web Server

lvs-rs1 :

Yum Install httpd service httpd startsetenforce 0echo "This is Lvs-rs1" >/var/www/html/index.html

lvs-rs2 :

Yum install httpdservice httpd startsetenforce 0echo "This is Lvs-rs2" >/var/www/html/index.html

Configuration Lvs-director Use Lvs-nat type, Round Robin the dispatch mode of the two servers to achieve load balancing

Lvs-director :

       grep -I  "Ip_vs"/boot/config  #查看当前内核是否编译了ipvs模块          Enable IP Forwarding,echo 1> /proc/sys/net/ipv4/ip_forward         #如果想永久生效需写入/etc/sysctl.conf file in        yum  install ipvsadm       #安装lvs命令行管理工具         service iptables stop      #关闭iptables because iptables and Ipvs cannot be turned on at the same time        service ipvsadm start     #启用ipvsadm进程        ipvsadm -a -t  192.168.1.107 -s rr            #添加一个虚拟服务地址, using RR (roundrobin) scheduling method         ipvsadm -a -t 192.168.1.107 -r172.16.100.8 -m         #添加一台realServer, run        ipvsadm -a -t 192.168.1.107 in a masquerade way  -r172.16.100.9 -m         #添加一台realserver, run in a masquerade way

Test:

Use other hosts to access

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test with the ab command

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View current LVS status

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It can be learned thatRR Scheduling is balanced forwarding

The actual application, the different server possibility can have the difference, must consider the weight, therefore uses Weightround Robin the Scheduling method

Lvs-director

Ipvsadm-e-t 192.168.1.107:80-s WRR #修改虚拟服务器的调度方式为wrr ipvsadm-e-T 192.168.1.107:80-r172.16.100.8-m-W 3 #将R The weight of the S1 is set to 3 ipvsadm-e-T 192.168.1.107:80-r172.16.100.9-m-W 1 #将RS2的权重设置为1

Test

Use other hosts to access

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test with the ab command

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View current LVS status

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from This, it can be learned thatthe higher the weight of WRR in the dispatch mode, the priority forwarding

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Lvs-nat implementing a Web server lb cluster