LVS-DR实现web调度模式

最新推荐文章于 2024-10-19 15:44:39 发布

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最新推荐文章于 2024-10-19 15:44:39 发布

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本文介绍如何在特定网络环境中部署LVS-DR模式的负载均衡器，并配置两台真实服务器提供Web服务。通过设置路由及使用iptables和ipvsadm等工具实现流量调度。

　实现LVS-DR调度web模式

拓扑环境

网络环境

RS1   
    RIP 192.168.198.138/24
    VIP 192.168.198.100/32
    GW  192.168.198.130
RS2 
    RIP 192.168.198.132/24
    VIP 192.168.198.100/32
    GW  192.168.198.130
VS
    DIP 192.168.198.128/24
    VIP 192.168.198.100/32
    GW  192.168.198.130
    
route 
    192.168.198.130/24
    172.16.253.166/16
Client 
    172.16.254.150/16
    GW 172.16.253.166
RS1,RS2的网关指向192.168.198.130

RS1

[root@RS1 html]# route del default gw 192.168.198.128
[root@RS1 html]# route add default gw 192.168.198.130

[root@RS1 ~]# iptables -F
[root@RS1 ~]# yum -y install httpd
[root@RS1 ~]# vim /var/www/html/index.html 
    welcome to RS1
[root@RS1 ~]# service httpd start

RS2

[root@RS2 network-scripts]# route add -net 172.16.0.0/16 gw 192.168.198.130
[root@RS2 network-scripts]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.16.0.0      192.168.198.130 255.255.0.0     UG    0      0        0 ens34
192.168.198.0   0.0.0.0         255.255.255.0   U     100    0        0 ens34
[root@RS2 ~]# iptables -F
[root@RS2 ~]# yum -y install httpd
[root@RS2 ~]# vim /var/www/html/index.html 
    welcome to RS2
[root@RS2 ~]# systemctl start httpd

VS

添加网关路由信息
[root@VS ~]# route add default gw 192.168.198.130
[root@VS ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.198.130 0.0.0.0         UG    0      0        0 ens34
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
192.168.198.0   0.0.0.0         255.255.255.0   U     100    0        0 ens34

[root@VS ~]# vim lvs_dr.sh
#! /bin/bash
vip=192.168.198.100
server=$vip:80
rip1=192.168.198.138
rip2=192.168.198.132
sch=wlc
dev=ens34:1   \\绑定网卡ens34
case $1 in
start)
    ifconfig $dev $vip/32 broadcast $vip  \\绑定vip到ens34网卡上
    iptables -F
    ipvsadm -A -t $server -s $sch
    ipvsadm -a -t $server -r $rip1 -g -w 3
    ipvsadm -a -t $server -r $rip2 -g -w 1
    ;;
stop)
    ipvsadm -C
    ipconfig $dev down
    ;;
*)
    echo "Usage:$(basename $0) start|stop"
    exit 1
    ;;
esac

[root@danran ~]# bash lvs_dr.sh start
[root@danran ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
  TCP  192.168.198.100:80 wlc
  -> 192.168.198.132:80           Route   1      0          0         
  -> 192.168.198.138:80           Route   3      0          0

添加RS1和RS2的VIP

dr_vip_rs.sh 为添加RS服务端VIP地址的脚本
[root@RS1 ~]# vim dr_vip_rs.sh 
#!/bin/bash
#
vip=192.168.198.100
mask='255.255.255.255'
dev=lo:1
case $1 in
start)
   echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
   echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
   echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
   echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
   ifconfig $dev $vip netmask $mask broadcast $vip up
   route add -host $vip dev $dev
   echo "VS server is Ready "
   ;;
stop)
   ifconfig $dev down
   echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
   echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
   echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
   echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
   echo "VS server is Cancel"
   ;;
*)
   echo "Usage $(basename $0) start|stop"
   exit 1
   ;;
esac   
[root@RS1 ~]# bash dr_vip_rs.sh start
VS server is Ready 
[root@RS2 ~]# bash dr_vip_rs.sh start
VS server is Ready

client

添加路由
[root@danran ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.16.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         172.16.0.1      0.0.0.0         UG    0      0        0 eth0

[root@danran ~]# route del default gw 172.16.0.1 
[root@danran ~]# route add default gw 172.16.253.166 \\添加默认路由
[root@danran ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.16.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         172.16.253.166  0.0.0.0         UG    0      0        0 eth0

测试  
[root@danran ~]# for i in {1..10};do curl --connect-timeout 1 192.168.198.100 ;sleep 1;done      
welcome to RS2
welcome to RS1
welcome to RS1
welcome to RS1
welcome to RS2
welcome to RS1
welcome to RS1
welcome to RS1
welcome to RS2
welcome to RS1