LVS实战案例

LVS-NAT模式案例

1. Director 服务器采用双网卡，一个是桥接网卡连接外网，一个是仅主机网卡与后端Web服务器相连
2. Web服务器采用仅主机网卡与director相连
3. Web服务器网关指向10.0.0.200
4. 后端web服务器不需要连接外网

范例：

环境：

共四台主机
一台： internet client ：172.20.0.123/16   GW:无
一台：lvs  
eth1 桥接 172.20.200.200/16
eth0 NAT 10.0.0.200/24

两台RS：
RS1: 10.0.0.7/24    GW： 10.0.0.200
RS2: 10.0.0.17/24   GW： 10.0.0.200

配置过程

#LVS启用IP_FORWORD功能
[root@lvs ~]#vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@LVS ~]#sysctl  -p

[root@lvs ~]#ipvsadm -A -t 172.20.200.200:80 -s rr
[root@lvs ~]#ipvsadm -a -t 172.20.200.200:80 -r 10.0.0.7 -m
[root@lvs ~]#ipvsadm -a -t 172.20.200.200:80 -r 10.0.0.17 -m

[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  172.20.200.200:80 rr
  -> 10.0.0.7:80                  Masq    1      0          0         
  -> 10.0.0.17:80                 Masq    1      0          0  

#测试
[root@client ~]#curl 172.20.200.200
RS2 Server on 10.0.0.17
[root@client ~]#curl 172.20.200.200
RS1 Server on 10.0.0.7
[root@client ~]#curl 172.20.200.200
RS2 Server on 10.0.0.17
[root@client ~]#curl 172.20.200.200
RS1 Server on 10.0.0.7

[root@LVS ~]#cat /proc/net/ip_vs_conn
Pro FromIP   FPrt ToIP     TPrt DestIP   DPrt State       Expires PEName PEData
TCP AC14C806 BD6A AC14C8C8 0050 0A000011 0050 TIME_WAIT        97
TCP AC14C806 BD6C AC14C8C8 0050 0A000007 0050 TIME_WAIT        97
TCP AC14C806 BD66 AC14C8C8 0050 0A000011 0050 TIME_WAIT        90
TCP AC14C806 BD68 AC14C8C8 0050 0A000007 0050 TIME_WAIT        92

#保存规则
[root@LVS ~]#ipvsadm -Sn > /etc/sysconfig/ipvsadm
[root@LVS ~]#cat /etc/sysconfig/ipvsadm
-A -t 172.20.200.200:80 -s rr
-a -t 172.20.200.200:80 -r 10.0.0.7:80 -m -w 1
-a -t 172.20.200.200:80 -r 10.0.0.17:80 -m -w 1

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

#重新加载规则
[root@LVS ~]#ipvsadm -R <  /etc/sysconfig/ipvsadm
[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  172.20.200.200:80 rr
  -> 10.0.0.7:80                  Masq    1      0          0         
  -> 10.0.0.17:80 

#开机加载ipvs规则
[root@LVS ~]#ipvsadm -C
[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 ~]#systemctl enable --now ipvsadm.service 
[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  172.20.200.200:80 rr
  -> 10.0.0.7:80                  Masq    1      0          0         
  -> 10.0.0.17:80                 Masq    1      0          0

[root@rs1 ~]#tail /var/log/httpd/access_log 
172.20.200.6 - - [24/Mar/2020:16:38:29 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
172.20.200.6 - - [24/Mar/2020:16:38:35 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
172.20.200.6 - - [24/Mar/2020:16:52:16 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
172.20.200.6 - - [24/Mar/2020:16:52:17 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
172.20.200.6 - - [24/Mar/2020:16:53:36 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
172.20.200.6 - - [24/Mar/2020:16:53:37 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"

#修改调度算法为 WRR 和后端服务器的端口
[root@LVS ~]#ipvsadm -E -t 172.20.200.200:80 -s wrr
[root@LVS ~]#ipvsadm -d -t 172.20.200.200:80 -r 10.0.0.7
[root@LVS ~]#ipvsadm -a -t 172.20.200.200:80 -r 10.0.0.7:8080 -m -w 3
[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  172.20.200.200:80 wrr
  -> 10.0.0.7:8080                Masq    3      0          0         
  -> 10.0.0.17:80                 Masq    1      0          1  

[root@rs1 ~]#vim /etc/httpd/conf/httpd.conf 
Listen 8080
[root@rs1 ~]#systemctl restart httpd

[root@client ~]#curl 172.20.200.200
RS1 Server on 10.0.0.7
[root@client ~]#curl 172.20.200.200
RS1 Server on 10.0.0.7
[root@client ~]#curl 172.20.200.200
RS1 Server on 10.0.0.7
[root@client ~]#curl 172.20.200.200
RS2 Server on 10.0.0.17

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