LVS的DR模式 - 技术栈

一.实验环境

1.路由器

2.调度器

3.真实服务器

一.实验环境

一台客户端、一台路由器、一台调度器、两台真实服务器

VMVare网络设置NAT模式子网IP为172.25.254.0，仅主机模式子网IP为192.168.0.0

1.路由器

VMVare设置eth0网卡为NAT模式，eth1为仅主机模式

XML 复制代码

[root@router ~]# cat /etc/NetworkManager/system-connections/eth0.nmconnection 
[connection]
id=eth0
type=ethernet
interface-namw=eth0

[ipv4]
address1=172.25.254.100/24,172.25.254.2
method=manual
dns=114.114.114.114;

[root@router ~]# cat /etc/NetworkManager/system-connections/eth1.nmconnection 
[connection]
id=eth1
type=ethernet
interface-namw=eth1

[ipv4]
address1=192.168.0.100/24
method=manual

2.调度器

VMVare设置eth1网卡为仅主机模式

XML 复制代码

[root@LVS ~]# cat /etc/NetworkManager/system-connections/eth1.nmconnection 
[connection]
id=eth1
type=ethernet
interface-namw=eth1

[ipv4]
address1=192.168.0.50/24,192.168.0.100
method=manual

3.真实服务器

VMVare设置eth0网卡为仅主机模式

XML 复制代码

[root@webserver1 ~]# cat /etc/NetworkManager/system-connections/eth0.nmconnection 
[connection]
id=eth0
type=ethernet
interface-namw=eth0

[ipv4]
address1=192.168.0.10/24,192.168.0.100
method=manual

XML 复制代码

[root@webserver2 ~]# cat /etc/NetworkManager/system-connections/eth0.nmconnection 
[connection]
id=eth0
type=ethernet
interface-namw=eth0

[ipv4]
address1=192.168.0.20/24,192.168.0.100
method=manual

4.客户端

VMVare设置eth0网卡为仅主机模式

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[root@client ~]# curl 192.168.0.200
webserver2 - 192.168.0.20
[root@client ~]# cat /etc/NetworkManager/system-connections/eth0.nmconnection 
[connection]
id=eth0
type=ethernet
interface-namw=eth0

[ipv4]
address1=172.25.254.200/24,172.25.254.100
method=manual

二.实验配置

1.路由器中打开内核路由器功能

XML 复制代码

[root@router ~]# echo "net.ipv4.ip_forward=1" > /etc/sysctl.conf

XML 复制代码

[root@router ~]# sysctl -a | grep ip_forward
net.ipv4.ip_forward = 1
net.ipv4.ip_forward_update_priority = 1
net.ipv4.ip_forward_use_pmtu = 0

2.RS主机中使vip不对外响应

XML 复制代码

[root@webserver1 ~]# echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore      
[root@webserver1 ~]# echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce 
[root@webserver1 ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore 
[root@webserver1 ~]# echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce

XML 复制代码

[root@webserver2 ~]# echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore      
[root@webserver2 ~]# echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce 
[root@webserver2 ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore 
[root@webserver2 ~]# echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce

3.在LVS主机和RS主机添加vip（临时添加，关机重启后需要重新添加）

XML 复制代码

[root@LVS ~]# ip a a 192.168.0.200/32 dev lo

XML 复制代码

[root@webserver1 ~]# ip a a 192.168.0.200/32 dev lo

XML 复制代码

[root@webserver2 ~]# ip a a 192.168.0.200/32 dev lo

4.在VS中添加调度策略

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[root@LVS ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

[root@LVS ~]# ipvsadm -A -t 192.168.0.200:80 -s wrr
[root@LVS ~]# ipvsadm -a -t 192.168.0.200:80 -r 192.168.0.10:80 -g -w 1
[root@LVS ~]# ipvsadm -a -t 192.168.0.200:80 -r 192.168.0.20:80 -g -w 2

[root@LVS ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.200:80 wrr
  -> 192.168.0.10:80              Route   1      0          0         
  -> 192.168.0.20:80

三.测试

XML 复制代码

[root@client ~]# for i in {1..10}
> do
> curl 192.168.0.200
> done
webserver2 - 192.168.0.20
webserver1 - 192.168.0.10
webserver2 - 192.168.0.20
webserver2 - 192.168.0.20
webserver1 - 192.168.0.10
webserver2 - 192.168.0.20
webserver2 - 192.168.0.20
webserver1 - 192.168.0.10
webserver2 - 192.168.0.20
webserver2 - 192.168.0.20