关于LVS负载均衡工作原理及其概述请访问：Centos 7之LVS负载均衡群集
关于地址转换（NAT）模式的负载均衡群集详细配置请访问：构建基于地址转换（LVS—NAT）模式的负载均衡群集
一、开始配置DR模式LVS
准备工作：
Centos 7操作系统四台；
Centos01模拟Web1服务器：IP地址/192.168.100.10
Centos02模拟Web2服务器：IP地址/192.168.100.20
Centos03模拟NFS服务器： IP地址/192.168.100.30
Centos05模拟LVS服务器： IP地址/192.168.100.50
Windows 客户端一台；
1、配置负载调度器
1）配置虚拟IP地址（VIP）
[root@centos05 ~]# cp /etc/sysconfig/network-scripts/ifcfg-ens32
/etc/sysconfig/network-scripts/ifcfg-ens32:0
[root@centos05 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens32:0
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
NAME=ens32:0
DEVICE=ens32:0
ONBOOT=yes
IPADDR=192.168.100.253
NATEMASK=255.255.255.0
[root@centos05 ~]# systemctl restart network
[root@centos05 ~]# ifconfig
ens32: flags=4163 mtu 1500
inet 192.168.100.50 netmask 255.255.255.0 broadcast 192.168.100.255
inet6 fe80::20c:29ff:fe16:c54b prefixlen 64 scopeid 0x20
ether 00:0c:29:16:c5:4b txqueuelen 1000 (Ethernet)
RX packets 2795 bytes 1095013 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1371 bytes 182001 (177.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens32:0: flags=4163 mtu 1500
inet 192.168.100.253 netmask 255.255.255.0 broadcast 192.168.100.255
ether 00:0c:29:16:c5:4b txqueuelen 1000 (Ethernet) 2）调整/proc相应参数
[root@centos05 ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.ens32.send_redirects = 0
[root@centos05 ~]# sysctl -p 3）配置负载分配策略
[root@centos05 ~]# modprobe ip_vs
[root@centos05 ~]# yum -y install ipvsadm
[root@centos05 ~]# ipvsadm -C
[root@centos05 ~]# ipvsadm -A -t 192.168.100.253:80 -s rr
[root@centos05 ~]# ipvsadm -a -t 192.168.100.253:80 -r 192.168.100.10:80 -g -w 1
[root@centos05 ~]# ipvsadm -a -t 192.168.100.253:80 -r 192.168.100.20:80 -g -w 1
[root@centos05 ~]# ipvsadm-save > /etc/sysconfig/ipvsadm
[root@centos04 ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.100.253:80 rr
-> 192.168.100.10:80 Route 1 0 0
-> 192.168.100.20:80 Route 1 0 0 2、配置web节点1服务器
[root@centos01 ~]# yum -y install httpd
[root@centos01 ~]# echo "www.benet.com" > /var/www/html/index.html
[root@centos01 ~]# systemctl start httpd
[root@centos01 ~]# systemctl enable httpd
[root@centos01 ~]# cp /etc/sysconfig/network-scripts/ifcfg-lo
/etc/sysconfig/network-scripts/ifcfg-lo:0
[root@centos01 ~]# vim /etc/sysconfig/network-scripts/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.100.253
NETMASK=255.255.255.255
ONBOOT=yes
[root@centos01 ~]# systemctl restart network
[root@centos01 ~]# ifconfig
lo:0: flags=73 mtu 65536
inet 192.168.100.253 netmask 255.255.255.255
loop txqueuelen 1 (Local Loopback)
[root@centos01 ~]# vim /etc/sysctl.conf
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
[root@centos01 ~]# sysctl -p 3、配置web节点2服务器
[root@centos02 ~]# yum -y install httpd
[root@centos02 ~]# echo "www.accp.com" > /var/www/html/index.html
[root@centos02 ~]# systemctl start httpd
[root@centos02 ~]# systemctl enable httpd
[root@centos01 ~]# scp /etc/sysctl.conf [email protected]:/etc/
The authenticity of host '192.168.100.30 (192.168.100.20)' can't be established.
ECDSA key fingerprint is SHA256:PUueT9fU9QbsyNB5NC5hbSXzaWxxQavBxXmfoknXl4I.
ECDSA key fingerprint is MD5:6d:f7:95:0e:51:1a:d8:9e:7b:b6:3f:58:51:51:4b:3b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.100.20' (ECDSA) to the list of known hosts.
[email protected]'s password:
sysctl.conf
[root@centos01 ~]# scp /etc/sysconfig/network-scripts/ifcfg-lo:0
[email protected]:/etc/sysconfig/network-scripts/
[email protected]'s password:
ifcfg-lo:0 100% 70 177.3KB/s 00:00
[root@centos02 ~]# sysctl -p
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
[root@centos02 ~]# systemctl restart network 4、客户端访问
客户端配置和服务器同网段IP地址，浏览器访问http://192.168.100.253
关闭浏览器删除缓存，重新访问就会得到一个新的页面，实现了负载均衡
二、安装NFS共享存储
1、配置NFS
[root@centos03 ~]# yum -y install rpcbind nfs-utils
[root@centos03 ~]# mkdir /web
[root@centos03 ~]# echo "www.nfs.com" > /web/index.html
[root@centos03 ~]# vim /etc/exports
/web 192.168.100.10(ro) 192.168.100.20(rw)
[root@centos03 ~]# systemctl start rpcbind
[root@centos03 ~]# systemctl start nfs
[root@centos03 ~]# systemctl enable rpcbind
[root@centos03 ~]# systemctl enable nfs
[root@centos03 ~]# showmount -e 192.168.100.30
Export list for 192.168.100.30:
/web 192.168.100.20,192.168.100.102、Web节点1服务器挂载共享目录
[root@centos01 ~]# mount 192.168.100.30:/web /var/www/html/
[root@centos01 ~]# cat /var/www/html/index.html
www.nfs.com
[root@centos01 ~]# systemctl restart httpd 3、Web节点2服务器挂载共享目录
[root@centos02 ~]# mount 192.168.100.30:/web /var/www/html/
[root@centos02 ~]# cat /var/www/html/index.html
www.nfs.com
[root@centos02 ~]# systemctl restart httpd 4、客户端访问
使用tail -f /var/log/httpd/access.log查看访问成功日志，一定要想监听再去访问才可以看到效果
5、配置自动挂载NFS
1）web节点1服务器
[root@centos01 ~]# vim /etc/fstab
192.168.100.30:/web /var/www/html/ nsf defaults 0 02）web节点2服务器
[root@centos02 ~]# vim /etc/fstab
192.168.100.30:/web /var/www/html/ nsf defaults 0 0—————— 本文至此结束，感谢阅读 ——————