LVS环境搭建

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网络配置

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                    +----------+
                    |  Client  |
                    +-----+----+
                      eth0|192.168.43.63
                          | 
---------------------------------------------net 192.168.43.0/24             
                          |
                      eth0|192.168.43.225
                    +----------+
                    |    LVS   |
                    +-----+----+
                      eth1|192.168.2.128
                          |
---------------------------------------------net 192.168.2.0/24
                          |
                 ------------------
    192.168.2.131|eth0        eth0|192.168.2.132
          +----------+        +----------+
          |RealServer|        |RealServer|
          +-----+----+        +-----+----+

环境安装

配置Server

  1. 客户端路由指向LB

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    route add -net 192.168.43.0 netmask 255.255.255.0 gw 192.168.2.128

  2. 配置http server

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    systemctl start nginx
    echo "192.168.2.131" > /usr/share/nginx/html/index.html

配置LB

系统使用centos 7

  1. 安装ipvsadm

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    yum -y install ipvsadm
    # enable IP forward
    echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
    sysctl -p

  2. 配置ipvs

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export VIP=192.168.43.225
export RS="192.168.2.131 192.168.2.132"
ipvsadm -A -t $VIP:80 -s lc 
for server in $RS; do
  ipvsadm -a -t $VIP:80 -r $server:80 -m
done

其中lc表示采用基于最小连接数的负载均衡算法

测试

在客户端上用浏览器或者curl 访问

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http://192.168.43.225

这时候会返回Real Server响应的内容

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# curl http://192.168.43.225
192.168.2.131

SamDeveloper