lvs负载均衡群集
群集
特点：由多台主机构成，都干同一件事，对外显示一个整体
企业集群分类
- 负载均衡群集
- 高可用群集
- 高性能运算群集
负载均衡群集（LB）
负载均衡的作用
- 提高应用系统的响应能力
- 可以处理更多的访问请求，减少延迟
- 获得高并发、高负载的整体性能
负载均衡的结构（HA）
- 第一层，负载调度器
- 第二层，服务器池
- 第三层，共享存储
高可用群集（HPC）
提高应用系统的可靠性、尽可能减少中断的时间，确保服务的连续性，达到高可用的容错效果
高性能运算群集
通过云计算或分布计算获取高性能的CPU、内存等资源，来提高整体运算能力
modprobe ip_vs #加载模块
cat /proc/net/ip_vs #查看模块版本
lvs三种工作模式
- nat模式，地址转换
- IP隧道，IP Tunnel，简称TUN模式
- 直连路由，简称DR模式
DR数据流向
1、客户通过VIP将访问请求发送到调度器（源IP为客户端IP，目的IP为VIP）发送到调度器
2、调度器通过调度算法选择分发请求的节点服务器，并重新封装数据报文（将源mac改为调度器的MAC地址，目的MAC地址改为节点服务器的MAC地址）再通过交换机转发给节点服务器
3、节点服务器收到请求报文后，确认目的MAC和目的IP无误后解包并送达到应用层进行处理
4、节点服务器要返回响应报文前，会先重新封装报文（源IP为VIP，目的IP为客户端IP），再将响应报文通过10接口传送给物理网卡然后直接发送给客户端
lvs的负载调度算法
轮询
加权轮询
最少连接
加权最少连接
lvs的调度和管理ipvsadm
ipvsadm
-A 添加虚拟服务器
-D 删除整个虚拟服务器
-s 指定负载调度算法
-d 删除某一个节点
-t 指定VIP地址TCP端口
-r 指定RIP地址TCP端口
-m 表示使用nat群集模式
-g 使用DR模式
-i 使用TUN模式
-w 设置权重
-p 保持长连接60秒
-l 列表查看lvs虚拟服务器，默认查看所有
-n 以数字形式显示地址，端口等，
LVS-NAT模式配置过程
nfs 106
web 102 101
调度器 104106
关闭防火墙
[root@localhost ~]# yum -y install rpcbind nfs-utils
[root@localhost ~]# cd /opt
[root@localhost opt]# mkdir test1 test2
[root@localhost opt]# echo 'this is test1 web page!' >test1/test.html
[root@localhost opt]# echo 'this is test2 web page!' >test2/test.html
[root@localhost opt]# vim /etc/exports
/opt/test1 192.168.65.0/24 (rw,sync,no_root_squash)
/opt/test2 192.168.65.0/24 (rw,sync,no_root_squash)[root@localhost opt]# systemctl start rpcbind.service
[root@localhost opt]# systemctl start nfs
[root@localhost opt]# showmount -e
Export list for localhost.localdomain:
/opt/test2 (everyone)
/opt/test1 (everyone)101
[root@www ~]#yum -y install httpd
[root@www ~]#vim /etc/httpd/conf/httpd.conf
ServerName www.test.com:80#修改主机名
KeepAlive off #关闭长连接，在最后一行加入
[root@www ~]#mount 192.168.65.106:/opt/test1 /var/www/html
[root@www ~]#df -Th
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root xfs 38G 5.6G 32G 15% /
devtmpfs devtmpfs 1.6G 0 1.6G 0% /dev
tmpfs tmpfs 1.6G 0 1.6G 0% /dev/shm
tmpfs tmpfs 1.6G 9.1M 1.6G 1% /run
tmpfs tmpfs 1.6G 0 1.6G 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 179M 836M 18% /boot
/dev/mapper/centos-home xfs 19G 33M 19G 1% /home
tmpfs tmpfs 326M 12K 326M 1% /run/user/42
tmpfs tmpfs 326M 0 326M 0% /run/user/0
192.168.65.106:/opt/test1 nfs4 38G 3.8G 34G 10% /var/www/html
[root@www ~]#systemctl start httpd.servicex25 (CCITT X.25)
[root@www ~]#netstat -lnpt | grep 80
tcp6 0 0 :::80 :::* LISTEN 4796/httpd102
[root@localhost ~]#cd /etc/yum.repos.d/
[root@localhost yum.repos.d]#vim nginx.repo
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true[root@localhost ~]#yum -y install nginx
[root@localhost yum.repos.d]#cd /usr/share/nginx/html
[root@localhost html]#ls
50x.html index.html
[root@localhost html]#mv * /opt
[root@localhost html]#cd /opt
[root@localhost opt]#ls
50x.html index.html rh[root@localhost opt]#mount 192.168.65.106:/opt/test2 /usr/share/nginx/html
[root@localhost opt]#df -hT
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root xfs 38G 4.3G 34G 12% /
devtmpfs devtmpfs 1.5G 0 1.5G 0% /dev
tmpfs tmpfs 1.5G 0 1.5G 0% /dev/shm
tmpfs tmpfs 1.5G 9.1M 1.5G 1% /run
tmpfs tmpfs 1.5G 0 1.5G 0% /sys/fs/cgroup
/dev/mapper/centos-home xfs 19G 33M 19G 1% /home
/dev/sda1 xfs 1014M 179M 836M 18% /boot
tmpfs tmpfs 302M 12K 302M 1% /run/user/42
tmpfs tmpfs 302M 0 302M 0% /run/user/0
192.168.65.106:/opt/test2 nfs4 38G 3.8G 34G 10% /usr/share/nginx/html
[root@localhost opt]#cd /usr/share/nginx/html
[root@localhost html]#mv /opt/*.html .
[root@localhost html]#ls
50x.html index.html test.html
[root@localhost html]#systemctl start nginx104
[root@localhost yum.repos.d]# yum -y install ipvsadm #安装ipvsadm 管理工具
添加一块网卡重启
[root@localhost ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 192.168.65.104 netmask 255.255.255.0 broadcast 192.168.65.255inet6 fe80::1468:e3ee:f1c7:7128 prefixlen 64 scopeid 0x20<link>ether 00:0c:29:73:1c:5f txqueuelen 1000 (Ethernet)RX packets 488 bytes 72686 (70.9 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 168 bytes 27262 (26.6 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet6 fe80::e67a:e7f3:fe88:4de2 prefixlen 64 scopeid 0x20<link>ether 00:0c:29:73:1c:69 txqueuelen 1000 (Ethernet)RX packets 4 bytes 240 (240.0 B)RX errors 0 dropped 0 overruns 0 frame 0TX packets 25 bytes 4326 (4.2 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536inet 127.0.0.1 netmask 255.0.0.0inet6 ::1 prefixlen 128 scopeid 0x10<host>loop txqueuelen 1 (Local Loopback)RX packets 68 bytes 5916 (5.7 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 68 bytes 5916 (5.7 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255ether 52:54:00:d2:63:f3 txqueuelen 1000 (Ethernet)RX packets 0 bytes 0 (0.0 B)RX errors 0 dropped 0 overruns 0 frame 0TX packets 0 bytes 0 (0.0 B)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# cp ifcfg-ens33 ifcfg-ens36
[root@localhost network-scripts]# vim ifcfg-ens36
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens36
DEVICE=ens36
ONBOOT=yes
IPADDR=12.0.0.10
NETMASK=255.255.255.0[root@localhost network-scripts]# vim ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=28634140-2cd6-48f1-bf8b-2116025cbcf9
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.65.104
NETMASK=255.255.255.0
#GATEWAY=192.168.65.2
#DNS1=8.8.8.8[root@localhost network-scripts]# systemctl restart network
[root@localhost network-scripts]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 192.168.65.104 netmask 255.255.255.0 broadcast 192.168.65.255inet6 fe80::1468:e3ee:f1c7:7128 prefixlen 64 scopeid 0x20<link>ether 00:0c:29:73:1c:5f txqueuelen 1000 (Ethernet)RX packets 1268 bytes 144292 (140.9 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 576 bytes 70962 (69.2 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 12.0.0.10 netmask 255.255.255.0 broadcast 12.0.0.255inet6 fe80::9c0:22b4:e61a:27eb prefixlen 64 scopeid 0x20<link>ether 00:0c:29:73:1c:69 txqueuelen 1000 (Ethernet)RX packets 108 bytes 13944 (13.6 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 89 bytes 13546 (13.2 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0[root@localhost network-scripts]# vim /etc/sysctl.conf
[root@localhost network-scripts]# sysctl -p
net.ipv4.ip_forward = 1修改101和102 网关
[root@www ~]#vim /etc/sysconfig/network-scripts/ifcfg-ens33
GATEWAY=192.168.65.104
[root@www ~]#systemctl restart network回到104
[root@localhost network-scripts]# iptables -F
[root@localhost network-scripts]# iptables -F -t nat
[root@localhost network-scripts]# iptables -t nat -A POSTROUTING -s 192.168.65.0/24 -o ens36 -j SNAT --to 12.0.0.10
[root@localhost network-scripts]# iptables -nL -t nat
Chain PREROUTING (policy ACCEPT)
target prot opt source destinationChain INPUT (policy ACCEPT)
target prot opt source destinationChain OUTPUT (policy ACCEPT)
target prot opt source destinationChain POSTROUTING (policy ACCEPT)
target prot opt source destination
SNAT all -- 192.168.65.0/24 0.0.0.0/0 to:12.0.0.10[root@localhost network-scripts]# modprobe ip_vs
[root@localhost network-scripts]# cat /proc/net/ip_vs
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn
[root@localhost network-scripts]# for i in $(ls /usr/lib/modules/$(uname -r)/kernel/net/netfilter/ipvs|grep -o "^[^.]*");do echo $i; /sbin/modinfo -F filename $i >/dev/null 2>&1 && /sbin/modprobe $i;done
ip_vs_dh
ip_vs_ftp
ip_vs
ip_vs_lblc
ip_vs_lblcr
ip_vs_lc
ip_vs_nq
ip_vs_pe_sip
ip_vs_rr
ip_vs_sed
ip_vs_sh
ip_vs_wlc
ip_vs_wrr
[root@localhost network-scripts]# ipvsadm-save > /etc/sysconfig/ipvsadm
[root@localhost network-scripts]# systemctl start ipvsadm.service
[root@localhost network-scripts]# ipvsadm -C #清楚原有策略
[root@localhost network-scripts]# ipvsadm -A -t 12.0.0.10:80 -s rr
[root@localhost network-scripts]# ipvsadm -ln #查看策略
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 12.0.0.10:80 rr
[root@localhost network-scripts]# ipvsadm -a -t 12.0.0.10:80 -r 192.168.80.101:80 -m
[root@localhost network-scripts]# ipvsadm -a -t 12.0.0.10:80 -r 192.168.80.102:80 -m
[root@localhost network-scripts]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr-> 192.168.80.101:http Masq 1 0 0-> 192.168.80.102:http Masq 1 0 0在一台IP为12.0.0.12的客户机使用浏览器访问 http://12.0.0.1/test.html 不断刷新浏览器测试负载均衡效果
LVS-DR模式配置过程
web服务器
192.168.65.104
192.168.65.105
nfs服务器
192.168.65.102
调度器
192.168.65.106
VIP地址192.168.65.128部署共享服务器
[root@localhost ~]# yum -y install rpcbind nfs-utils
[root@localhost ~]# mkdir /var/www/html
[root@localhost ~]#cd /var/www/html
[root@localhost html]#mkdir web1 web2
[root@localhost html]# echo 'this is web1' >web1/test.html
[root@localhost html]# echo 'this is web2' >web2/test.html
[root@localhost opt]# vim /etc/exports
/opt/test1 192.168.65.0/24 (rw,sync,no_root_squash)
/opt/test2 192.168.65.0/24 (rw,sync,no_root_squash)[root@localhost opt]# systemctl start rpcbind.service
[root@localhost opt]# systemctl start nfs
[root@localhost ~]#showmount -e
Export list for localhost.localdomain:
/var/www/html/web2 192.168.65.0/24
/var/www/html/web1 192.168.65.0/24web服务器
104
[root@localhost ~]#yum -y install nginx #用自己的nginx.repo安装
[root@localhost ~]# cd /usr/share/nginx/html/
[root@localhost html]# mv * /opt
[root@localhost html]# vim /etc/fstab
192.168.65.102:/var/www/html/web1 /usr/share/nginx/html nfs defaults,_netdev 0 0
[root@localhost html]# cd /opt
[root@localhost opt]# mv *.html /usr/share/nginx/html/
[root@localhost opt]# mount -a
[root@localhost opt]# cd /usr/share/nginx/html/
[root@localhost html]# ls
50x.html index.html test.html
[root@localhost html]# cat test.html
<h1> this is web1</h1>
[root@localhost html]# systemctl start nginx105
[root@localhost ~]#yum -y install nginx #用自己的nginx.repo安装
[root@localhost ~]# cd /usr/share/nginx/html/
[root@localhost html]# mv * /opt
[root@localhost html]# vim /etc/fstab
192.168.65.102:/var/www/html/web2 /usr/share/nginx/html nfs defaults,_netdev 0 0
[root@localhost html]# cd /opt
[root@localhost opt]# mv *.html /usr/share/nginx/html/
[root@localhost opt]# mount -a
[root@localhost opt]# cd /usr/share/nginx/html/
[root@localhost html]# ls
50x.html index.html test.html
[root@localhost html]# cat test.html
<h1> this is web2</h1>
[root@localhost html]# systemctl start nginx两个web服务器同样操作
[root@localhost html]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# vim ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=28634140-2cd6-48f1-bf8b-2116025cbcf9
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.65.104
NETMASK=255.255.255.0
#GATEWAY=192.168.65.106
#DNS1=8.8.8.8[root@localhost network-scripts]# systemctl restart network
[root@localhost network-scripts]# vim /etc/sysctl.conf
[root@localhost network-scripts]# sysctl -p
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
[root@localhost network-scripts]# ls
ifcfg-ens33 ifdown-isdn ifup ifup-plip ifup-tunnel
ifcfg-lo ifdown-post ifup-aliases ifup-plusb ifup-wireless
ifdown ifdown-ppp ifup-bnep ifup-post init.ipv6-global
ifdown-bnep ifdown-routes ifup-eth ifup-ppp network-functions
ifdown-eth ifdown-sit ifup-ib ifup-routes network-functions-ipv6
ifdown-ib ifdown-Team ifup-ippp ifup-sit
ifdown-ippp ifdown-TeamPort ifup-ipv6 ifup-Team
ifdown-ipv6 ifdown-tunnel ifup-isdn ifup-TeamPort
[root@localhost network-scripts]# vim ifcfg-lo:0
DEVICE=lo:0
ONBOOT=yes
IPADDR=192.168.65.128 #VIP地址，随便设
NETMASK=255.255.255.255 #固定的[root@localhost network-scripts]# ifup lo:0
[root@localhost network-scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet 192.168.65.128/32 brd 192.168.65.128 scope global lo:0valid_lft forever preferred_lft foreverinet6 ::1/128 scope hostvalid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:38:f8:2e brd ff:ff:ff:ff:ff:ffinet 192.168.65.105/24 brd 192.168.65.255 scope global ens33valid_lft forever preferred_lft foreverinet6 fe80::fbdd:bf23:9285:4611/64 scope linkvalid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000link/ether 52:54:00:46:82:bb brd ff:ff:ff:ff:ff:ffinet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000link/ether 52:54:00:46:82:bb brd ff:ff:ff:ff:ff:ff
[root@localhost network-scripts]# route add -host 192.168.65.128 dev lo:0
#永久添加路由
#vim /etc/rc.d/rc.local
#route add -host 192.168.65.128 dev lo:0
#chmod +x /etc/rc.d/rc.local
[root@localhost network-scripts]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.65.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
192.168.65.128 0.0.0.0 255.255.255.255 UH 0 0 0 lo
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0调度器 106
[root@localhost ~]# systemctl stop firewalld.service
[root@localhost ~]# setenforce 0
[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# vim ifcfg-ens33:0
[root@localhost network-scripts]# ifup ens33:0
[root@localhost network-scripts]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 192.168.65.106 netmask 255.255.255.0 broadcast 192.168.65.255inet6 fe80::6e6:5516:e3a5:1df5 prefixlen 64 scopeid 0x20<link>ether 00:0c:29:f6:41:44 txqueuelen 1000 (Ethernet)RX packets 969 bytes 123656 (120.7 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 614 bytes 94990 (92.7 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 192.168.65.128 netmask 255.255.255.255 broadcast 192.168.65.128ether 00:0c:29:f6:41:44 txqueuelen 1000 (Ethernet)lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536inet 127.0.0.1 netmask 255.0.0.0inet6 ::1 prefixlen 128 scopeid 0x10<host>loop txqueuelen 1 (Local Loopback)RX packets 560 bytes 48664 (47.5 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 560 bytes 48664 (47.5 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255ether 52:54:00:62:7b:1b txqueuelen 1000 (Ethernet)RX packets 0 bytes 0 (0.0 B)RX errors 0 dropped 0 overruns 0 frame 0TX packets 0 bytes 0 (0.0 B)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0[root@localhost network-scripts]# vim /etc/sysctl.conf
[root@localhost network-scripts]# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.ens33.send_redirects = 0
[root@localhost network-scripts]#
[root@localhost network-scripts]# yum install -y ipvsadm正在安装 : ipvsadm-1.27-8.el7.x86_64 1/1验证中 : ipvsadm-1.27-8.el7.x86_64 1/1已安装:ipvsadm.x86_64 0:1.27-8.el7完毕！
[root@localhost network-scripts]# ipvsadm-save > /etc/sysconfig/ipvsadm
[root@localhost network-scripts]# systemctl start ipvsadm
[root@localhost network-scripts]# modprobe ip_vs
[root@localhost network-scripts]# cat /proc/net/ip_vs
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn
[root@localhost network-scripts]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn
[root@localhost network-scripts]# ipvsadm -C
[root@localhost network-scripts]# ipvsadm -A -t 192.168.65.128:80 -s rr
[root@localhost network-scripts]# ipvsadm -a -t 192.168.65.128:80 -r 192.168.65.104:80 -g
[root@localhost network-scripts]# ipvsadm -a -t 192.168.65.128:80 -r 192.168.65.105:80 -g
[root@localhost network-scripts]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr-> 192.168.65.104:http Route 1 0 0-> 192.168.65.105:http Route 1 0 0在浏览器输入网址http://192.168.65.128/test.html 可以查看网页,不断刷新查看负载均衡效果
