lvs-nat算法
nat模型样式
vs服务器：公网地址 172.18.250.253
私网地址 192.168.57.129 （DIP）
各私网服务器网关指向服务器DIP
各私网服务器做集群：web （telnet，ssh）
私网服务器使用httpd实现
rs私网服务器1 centos7 ip：192.168.57.132
rs私网服务器2 centos6 ip：192.168.57.128
设置网卡属性：
rs1[root@CentOS7 ~]#nmtui 开启图形界面编辑IP地址
Addresses：192.168.57.132/24
Gateway：192.168.57.129
DNS servers：172.18.0.1
rs1[root@CentOS7 ~]#systemctl restart network.service
rs2[root@CentOS6 ~]#setup 开启图形界面编辑IP地址
Static IP: 192.168.57.128
Netmask: 255.255.255.0
gateway IP: 192.168.57.129
DNS servers：172.18.0.1
rs2[root@CentOS6 ~]#service network restart
vs[root@CentOS7 ~]#yum -y install ipvsadm
rs1[root@CentOS7 ~]# yum -y install httpd telnet-server tftp-server
rs1[root@CentOS7 ~]#vim /var/www/html/index.html
<h1>RS1:192.168.57.132</h1>
rs1[root@CentOS7 ~]# systemctl start httpd.service
rs1[root@CentOS6 ~]#ss -tnl
rs2[root@CentOS6 ~]#yum -y install httpd telnet-server tftp-server
rs2[root@CentOS6 ~]#vim /var/www/html/index.html
<h1>RS2:192.168.57.128</h1>
rs2[root@CentOS6 ~]#service httpd start
rs2[root@CentOS6 ~]#ss -tnl
vs访问rs：
vs[root@CentOS7 ~]#curl http://192.168.57.132
<h1>RS1:192.168.57.132</h1>
vs[root@CentOS7 ~]#curl http://192.168.57.128
<h1>RS2:192.168.57.128</h1>
定义集群服务：
vs[root@CentOS7 ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
vs[root@CentOS7 ~]# echo 1 > /proc/sys/net/ipv4/ip_forward
vs[root@CentOS7 ~]#ipvsadm -A -t 172.18.250.253:80 -s rr
vs[root@CentOS7 ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.18.250.253:80 rr
vs[root@CentOS7 ~]#ipvsadm -a -t 172.18.250.253:80 -r 192.168.57.132 -m
vs[root@CentOS7 ~]#ipvsadm -a -t 172.18.250.253:80 -r 192.168.57.128 -m
vs[root@CentOS7 ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.18.250.253:80 rr
-> 192.168.57.128:80 Masq 1 0 0
-> 192.168.57.132:80 Masq 1 0 0
~]#for i in {1..10};do curl http://172.18.252.253;done
<h1>RS1:192.168.57.132</h1>
<h1>RS2:192.168.57.128</h1>
<h1>RS1:192.168.57.132</h1>
<h1>RS2:192.168.57.128</h1>
修改权重：
vs[root@CentOS7 ~]# ipvsadm -e -t 172.18.252.253:80 -r 192.168.57.132 -m -w 2
vs[root@CentOS7 ~]# ipvsadm -E -t 172.18.252.253:80 -s wrr
vs[root@CentOS7 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.18.250.253:80 wrr
-> 192.168.57.128:80 Masq 1 0 5
-> 192.168.57.132:80 Masq 2 0 5
~]#for i in {1..10};do curl http://172.18.250.253; done
<h1>RS1:192.168.57.132</h1>
<h1>RS2:192.168.57.128</h1>
<h1>RS1:192.168.57.132</h1>
<h1>RS1:192.168.57.132</h1>
<h1>RS2:192.168.57.128</h1>
<h1>RS1:192.168.57.132</h1>
<h1>RS1:192.168.57.132</h1>
telnet：
添加用户：
rs1[root@CentOS7 ~]# for i in {1..3}; do useradd user$i;echo "mageedu" | passwd --stdin user$i; done
rs1[root@CentOS7 ~]# systemctl start telnet.socket
rs1[root@CentOS7 ~]# ss -tnl
LISTEN 0 128 :::23 :::*
rs2[root@CentOS6 ~]# for i in {1..3}; do useradd user$i;echo "mageedu" | passwd --stdin user$i; done
rs2[root@CentOS6 html]#chkconfig telnet on
rs2[root@CentOS6 html]#service xinetd restart
Stopping xinetd: [FAILED]
Starting xinetd: [ OK ]
rs2[root@CentOS6 html]#ss -tnl
LISTEN 0 64 :::23 :::*
vs[root@CentOS7 ~]# ipvsadm -A -t 172.18.250.253:23 -s lc
vs[root@CentOS7 ~]# ipvsadm -a -t 172.18.250.253:23 -r 192.168.57.132:23 -m -w 1
vs[root@CentOS7 ~]# ipvsadm -a -t 172.18.250.253:23 -r 192.168.57.128:23 -m -w 3
vs[root@CentOS7 ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.18.252.253:23 lc
-> 192.168.57.128:23 Masq 3 0 0
-> 192.168.57.132:23 Masq 1 0 0
~]#telnet 172.18.252.253
login: user1
Password: mageedu
[user1@CentOS6 ~]$ ip a
inet 192.168.57.128/24
[user2@CentOS7 ~]$ ip a
inet 192.168.57.132/24
[user3@CentOS6 ~]$ ip a
inet 192.168.57.128/24
vs[root@CentOS7 ~]# ipvsadm -E -t 172.18.252.253:23 -s wlc
vs[root@CentOS7 ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.18.252.253:23 wlc
-> 192.168.57.128:23 Masq 3 0 1
-> 192.168.57.132:23 Masq 1 0 0
把wrr修改为sh算法：
[root@CentOS7 ~]# ipvsadm -E -t 172.18.250.253:80 -s sh
[root@CentOS7 ~]# ipvsadm -ln
TCP 172.18.252.253:80 sh
-> 192.168.57.128:80 Masq 1 0 0
-> 192.168.57.132:80 Masq 2 0 0
[root@CentOS7 ~]#for i in {1..10};do curl http://172.18.252.253;done
<h1>RS2:192.168.57.128</h1>
<h1>RS2:192.168.57.128</h1>
<h1>RS2:192.168.57.128</h1>
<h1>RS2:192.168.57.128</h1>
<h1>RS2:192.168.57.128</h1>
rs2宕机：
vs[root@CentOS7 ~]# ipvsadm -E -t 172.18.250.253:80 -s rr
rs2[root@CentOS6 ~]#service httpd stop
Stopping httpd: [ OK ]
~]#for i in {1..10};do curl http://172.18.252.253;done
curl: (7) Failed connect to 172.18.252.253:80; Connection refused
<h1>RS1:192.168.57.132</h1>
curl: (7) Failed connect to 172.18.252.253:80; Connection refused
<h1>RS1:192.168.57.132</h1>
curl: (7) Failed connect to 172.18.252.253:80; Connection refused
<h1>RS1:192.168.57.132</h1>
原创文章，作者：CL80516000，如若转载，请注明出处：http://www.178linux.com/75646
