二、LVS的安装部署

系统必须有ip_vs模块

#查看ip_vs模块
[root@node1 ~]# lsmod |grep -i ip_vs
ip_vs_rr               12600  1 
ip_vs                 141432  3 ip_vs_rr
nf_conntrack          133053  7 ip_vs,nf_nat,nf_nat_ipv4,nf_nat_ipv6,xt_conntrack,nf_conntrack_ipv4,nf_conntrack_ipv6
libcrc32c              12644  4 xfs,ip_vs,nf_nat,nf_conntrack
#没有,加载ip_vs
[root@node1 ~]# modprobe ip_vs

一、LVS的安装

1、yum安装

#1、安装清华的epel源
#2、安装ipvadm
yum install -y ipvsadm

2、源码包安装

#https://mirrors.edge.kernel.org/pub/linux/utils/kernel/ipvsadm/选择与内核相同版本的软件
mkdir -p /server/tools
cd /server/tools
wget -c https://mirrors.edge.kernel.org/pub/linux/utils/kernel/ipvsadm/ipvsadm-1.30.tar.xz
ln -s /usr/src/kernels/3.10.0-1062.18.1.el7.x86_64/ /usr/src/linux
tar xzvf ipvsadm-1.30.tar.gz 
cd ipvsadm-1.30
make 
make install
#如果编译报错,请安装依赖包
#yum install -y popt-static kernel-devel make gcc openssl-devel lftplibnl* popt* openssl-devel lftplibnl* popt* libnl* libpopt* gcc*

二、ipvsadm命令详解

ipvsadm是ipvs的管理器,需要yum安装。

LVS 相关软件

程序包:ipvsadm Unit File: ipvsadm.service 主程序:/usr/sbin/ipvsadm 规则保存工具:/usr/sbin/ipvsadm-save 规则重载工具:/usr/sbin/ipvsadm-restore 配置文件:/etc/sysconfig/ipvsadm-config ipvs调度规则文件:/etc/sysconfig/ipvsadm

ipvsadm 命令

ipvsadm核心功能:

1、集群服务管理:增、删、改
2、集群服务的RS管理:增、删、改
3、查看

  

ipvsadm 工具用法:

#管理集群服务
ipvsadm -A|E -t|u|f service-address [-s scheduler] [-p [timeout]] [-M netmask]
[--pe persistence_engine] [-b sched-flags]
ipvsadm -D -t|u|f service-address #删除
ipvsadm –C #清空
ipvsadm –R #重载,相当于ipvsadm-restore
ipvsadm -S [-n] #保存,相当于ipvsadm-save
#管理集群中的RS
ipvsadm -a|e -t|u|f service-address -r server-address [-g|i|m] [-w weight]
ipvsadm -d -t|u|f service-address -r server-address
ipvsadm -L|l [options]
ipvsadm -Z [-t|u|f service-address]

管理集群服务:增、改、删 增、修改:

 ipvsadm -A|E -t|u|f service-address [-s scheduler] [-p [timeout]] 

删除:

ipvsadm -D -t|u|f service-address

service-address:
-t|u|f:
-t: TCP协议的端口,VIP:TCP_PORT
-u: UDP协议的端口,VIP:UDP_PORT
-f:firewall MARK,标记,一个数字
[-s scheduler]:指定集群的调度算法,默认为wlc
ipvsadm

管理集群上的RS:增、改、删 增、改:

ipvsadm -a|e -t|u|f service-address -r server-address [-g|i|m] [-w weight]

  删:

ipvsadm -d -t|u|f service-address -r server-address

server-address:
rip[:port] 如省略port,不作端口映射
选项:
lvs类型:
-g: gateway, dr类型,默认
-i: ipip, tun类型
-m: masquerade, nat类型
-w weight:权重

  清空定义的所有内容:

ipvsadm -C

  清空计数器:

ipvsadm -Z [-t|u|f service-address]

  查看:

ipvsadm -L|l [options]

--numeric, -n:以数字形式输出地址和端口号
--exact:扩展信息,精确值
--connection,-c:当前IPVS连接输出
--stats:统计信息
--rate :输出速率信息

  ipvs规则:

/proc/net/ip_vs

  ipvs连接:

/proc/net/ip_vs_conn

  保存:建议保存至/etc/sysconfig/ipvsadm

ipvsadm-save > /PATH/TO/IPVSADM_FILE
ipvsadm -S > /PATH/TO/IPVSADM_FILE
systemctl stop ipvsadm.service #会自动保存规则至/etc/sysconfig/ipvsadm

  重载:

ipvsadm-restore < /PATH/FROM/IPVSADM_FILE
systemctl start ipvsadm.service #会自动加载/etc/sysconfig/ipvsadm中规则

  

防火墙标记

FWM:FireWall Mark MARK target 可用于给特定的报文打标记 --set-mark value 其中:value 可为0xffff格式,表示十六进制数字 借助于防火墙标记来分类报文,而后基于标记定义集群服务;可将多个不同的应用使用同一个集群服务 进行调度 实现方法: 在Director主机打标记:

iptables -t mangle -A PREROUTING -d $vip -p $proto -m multiport --dports
$port1,$port2,… -j MARK --set-mark NUMBER

  在Director主机基于标记定义集群服务:

ipvsadm -A -f NUMBER [options]

  范例:

[root@lvs ~]#iptables -t mangle -A PREROUTING -d 172.16.0.100 -p tcp -m
multiport --dports 80,443 -j MARK --set-mark 10
[root@lvs ~]#ipvsadm -C
[root@lvs ~]#ipvsadm -A -f 10 -s rr
[root@lvs ~]#ipvsadm -a -f 10 -r 10.0.0.7 -g
[root@lvs ~]#ipvsadm -a -f 10 -r 10.0.0.17 -g
[root@lvs ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
FWM 10 rr
-> 10.0.0.7:0 Route 1 0 0
-> 10.0.0.17:0 Route 1 0 0
[root@lvs ~]#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
FWM 0000000A rr
-> 0A000011:0000 Route 1 0 9
-> 0A000007:0000 Route 1 0 9

范例:

[root@lvs ~]#ipvsadm -A -f 10
[root@lvs ~]#ipvsadm -a -f 10 -r 10.0.0.7 -g
[root@lvs ~]#ipvsadm -a -f 10 -r 10.0.0.17 -g
[root@lvs ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
FWM 10 wlc
-> 10.0.0.7:0 Route 1 0 0
-> 10.0.0.17:0 Route 1 0 0

[root@LVS ~]#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
TCP AC14C8C8:0050 rr
-> 0A000011:0050 Masq 1 0 0
-> 0A000007:0050 Masq 1 0 0

LVS 持久连接

session 绑定:对共享同一组RS的多个集群服务,需要统一进行绑定,lvs sh算法无法实现 持久连接( lvs persistence )模板:实现无论使用任何调度算法,在一段时间内(默认360s ),能够 实现将来自同一个地址的请求始终发往同一个RS

 ipvsadm -A|E -t|u|f service-address [-s scheduler] [-p [timeout]] 

持久连接实现方式:

1、每端口持久(PPC):每个端口定义为一个集群服务,每集群服务单独调度
2、每防火墙标记持久(PFWMC):基于防火墙标记定义集群服务;可实现将多个端口上的应用统一调度,即所谓的port Affinity
3、每客户端持久(PCC):基于0端口(表示所有服务)定义集群服务,即将客户端对所有应用的请求都调度至后端主机,必须定义为持久模式

  范例:

[root@lvs ~]#ipvsadm -E -f 10 -p
[root@lvs ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
FWM 10 wlc persistent 360
-> 10.0.0.7:0 Route 1 0 15
-> 10.0.0.17:0 Route 1 0 7
[root@lvs ~]#ipvsadm -E -f 10 -p 3600
[root@lvs ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
FWM 10 wlc persistent 3600
-> 10.0.0.7:0 Route 1 0 79
-> 10.0.0.17:0 Route 1 0 7

[root@lvs ~]#cat /proc/net/ip_vs_conn
Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData
TCP C0A80006 C816 AC100064 01BB 0A000011 01BB FIN_WAIT 67
TCP C0A80006 C812 AC100064 01BB 0A000011 01BB FIN_WAIT 67
TCP C0A80006 9A36 AC100064 0050 0A000011 0050 FIN_WAIT 65
TCP C0A80006 C806 AC100064 01BB 0A000011 01BB FIN_WAIT 65
TCP C0A80006 9A3E AC100064 0050 0A000011 0050 FIN_WAIT 66
TCP C0A80006 C81A AC100064 01BB 0A000011 01BB FIN_WAIT 67
TCP C0A80006 C80A AC100064 01BB 0A000011 01BB FIN_WAIT 66
TCP C0A80006 9A3A AC100064 0050 0A000011 0050 FIN_WAIT 66
TCP C0A80006 9A4E AC100064 0050 0A000011 0050 FIN_WAIT 68
TCP C0A80006 9A42 AC100064 0050 0A000011 0050 FIN_WAIT 67
TCP C0A80006 9A46 AC100064 0050 0A000011 0050 FIN_WAIT 67
TCP C0A80006 C81E AC100064 01BB 0A000011 01BB FIN_WAIT 68
IP C0A80006 0000 0000000A 0000 0A000011 0000 NONE 948
TCP C0A80006 C80E AC100064 01BB 0A000011 01BB FIN_WAIT 66
TCP C0A80006 9A4A AC100064 0050 0A000011 0050 FIN_WAIT 67

[root@lvs ~]#ipvsadm -Lnc
IPVS connection entries
pro expire state source virtual destination
TCP 00:46 FIN_WAIT 192.168.0.6:51222 172.16.0.100:443 10.0.0.17:443
TCP 00:46 FIN_WAIT 192.168.0.6:51218 172.16.0.100:443 10.0.0.17:443
TCP 00:45 FIN_WAIT 192.168.0.6:39478 172.16.0.100:80 10.0.0.17:80
TCP 00:45 FIN_WAIT 192.168.0.6:51206 172.16.0.100:443 10.0.0.17:443
TCP 00:46 FIN_WAIT 192.168.0.6:39486 172.16.0.100:80 10.0.0.17:80
TCP 00:47 FIN_WAIT 192.168.0.6:51226 172.16.0.100:443 10.0.0.17:443
TCP 00:45 FIN_WAIT 192.168.0.6:51210 172.16.0.100:443 10.0.0.17:443
TCP 00:45 FIN_WAIT 192.168.0.6:39482 172.16.0.100:80 10.0.0.17:80
TCP 00:47 FIN_WAIT 192.168.0.6:39502 172.16.0.100:80 10.0.0.17:80
TCP 00:46 FIN_WAIT 192.168.0.6:39490 172.16.0.100:80 10.0.0.17:80
TCP 00:46 FIN_WAIT 192.168.0.6:39494 172.16.0.100:80 10.0.0.17:80
TCP 00:47 FIN_WAIT 192.168.0.6:51230 172.16.0.100:443 10.0.0.17:443
IP 15:27 NONE 192.168.0.6:0 0.0.0.10:0 10.0.0.17:0
TCP 00:46 FIN_WAIT 192.168.0.6:51214 172.16.0.100:443 10.0.0.17:443
TCP 00:47 FIN_WAIT 192.168.0.6:39498 172.16.0.100:80 10.0.0.17:80

三、部署LVS NAT

1、LVS NAT模式注意事项

LVS NAT模式工作原理 用户请求LVS VIP到达director(LVS服务器:LB)(公网VIP:211.1.1.1),director 将请求的报文的目标IP地址改成后端的realserver IP地址,同时将报文的目标端口 也改成后端选定的realserver相应端口,最后将报文发送到realserver,realserver 将数据返给director,director再把数据发送给用户。(两次请求都经过director, 所以访问大的话,director会成为瓶颈),

1)、LVS服务器至少2块物理网卡,一块连接公网(VIP),一块连接内网;
2)、后端Realserver机器的默认网关设置为LVS的内网IP地址;
3)、保证LVS内网网卡通常跟Realserver在同一网段;
4)、LVS NAT模式后端Realserver机器数量不超过30台;
5)、用户的请求进入和返回均会经过LVS,LVS会成为瓶颈。

2、实验环境

 

DR: inode1:外网ip:10.0.0.101   内网ip:172.16.1.101
RS1: inode2:172.16.1.102----->web页面 www.ywx1.com
RS2: inode3:172.16.1.103----->web页面 www.ywx2.com

[root@inode1 ~]# uname -r
3.10.0-862.el7.x86_64
[root@inode1 ~]# cat /etc/redhat-release 
CentOS Linux release 7.5.1804 (Core) 

3、部署RS1和RS2的nginx

[root@inode2 ~]# curl 172.16.1.102
www.ywx1.com

[root@inode3 ~]# curl 172.16.1.103
www.ywx2.com

  

4、将RS1和RS2的网关配置为DR的内网ip地址:172.16.1.101

[root@inode2 ~]#  sed -i '$aGATEWAY=172.16.1.101' /etc/sysconfig/network-scripts/ifcfg-eth1
[root@inode2 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=172.16.1.102
PREFIX=24
GATEWAY=172.16.1.101
[root@inode2 ~]#systemctl restart network



[root@inode3 ~]#  sed -i '$aGATEWAY=172.16.1.101' /etc/sysconfig/network-scripts/ifcfg-eth1
[root@inode3 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=172.16.1.103
PREFIX=24
GATEWAY=172.16.1.101
[root@inode3 ~]#systemctl restart network

5、部署NAT的LVS

第一步:安装LVS

 yum install -y ipvsadm 

第二步:把DR的外网ip:10.0.0.101作为VIP,加入lvs集群

ipvsadm -A -t 10.0.0.101:80 -s rr

#-A 添加虚拟服务器的VIP
#-t TCP协议,ip:port
#-s 指定算法为RR轮训模式

第三步:#在虚拟集群10.10.10.101中,加入后端Realserver服务器

ipvsadm -a -t 10.0.0.101:80 -r 172.16.1.102 -m -w 50
ipvsadm -a -t 10.0.0.101:80 -r 172.16.1.103 -m -w 50

# -a,往虚拟服务器集群中添加真实服务器;
# -t,TCP协议;
# -r,指定后端realserver服务器的IP和端口;
# -m,指定NAT转发模式;
# -w,weight权重设置;

查看LVS信息

[root@inode1 ~]# ipvsadm -L -n 
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.101:80 rr
  -> 172.16.1.102:80              Masq    50     0          0         
  -> 172.16.1.103:80              Masq    50     0          0              

第四步:LVS NAT模式能够实现数据转发,还要依靠Linux内核开启转发功能

#临时生效
echo 1 > /proc/sys/net/ipv4/ip_forward
#关闭icmp的重定向
echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/default/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/eth0/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/eth1/send_redirects

#永久生效
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.eth0.send_redirects = 0
net.ipv4.conf.eth1.send_redirects = 0

sysctl -p

第五步:测试

在inode4上访问10.0.0.101

[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx1.com

在DR inode1上观察InAction发现是负载均衡

[root@inode1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.101:80 rr
  -> 172.16.1.102:80              Masq    50     0          3         
  -> 172.16.1.103:80              Masq    50     0          2  

注意:

在实验模式NAT时,要关闭RS服务器上的外网网卡,否则会因为RS上有外网路由的问题,造成VIP地址无法访问后端页面

6、删除和添加RS

删除RS1,inode2

[root@inode1 ~]# ipvsadm -d -t 10.0.0.101:80 -r 172.16.1.102

[root@inode1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.101:80 rr
  -> 172.16.1.103:80              Masq    50     0          7  

继续在inode4上访问VIP

[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com

RS1被删除后,客户端访问没有影响

重新添加会RS1

[root@inode1 ~]# ipvsadm -a -t 10.0.0.101:80 -r 172.16.1.102 -m -w 50
[root@inode1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.101:80 rr
  -> 172.16.1.102:80              Masq    50     0          0         
  -> 172.16.1.103:80              Masq    50     0          0       

inode4上访问VIP

[root@inode4 ~]# curl 10.0.0.101
www.ywx1.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx1.com
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com

在lvs 10.0.0.101上查看lvs连接
[root@node1 ~]# cat /proc/net/ip_vs_conn
Pro FromIP   FPrt ToIP     TPrt DestIP   DPrt State       Expires PEName PEData
TCP 0A000068 B522 0A000065 0050 ACA80167 0050 TIME_WAIT       116
TCP 0A000068 B51C 0A000065 0050 ACA80166 0050 TIME_WAIT       113
TCP 0A000068 B516 0A000065 0050 ACA80167 0050 TIME_WAIT       110
TCP 0A000068 B51E 0A000065 0050 ACA80167 0050 TIME_WAIT       114
TCP 0A000068 B520 0A000065 0050 ACA80166 0050 TIME_WAIT       115
TCP 0A000068 B51A 0A000065 0050 ACA80167 0050 TIME_WAIT       112
TCP 0A000068 B514 0A000065 0050 ACA80166 0050 TIME_WAIT       109
TCP 0A000068 B518 0A000065 0050 ACA80166 0050 TIME_WAIT       111

lvs自动均衡到2台服务器上

我们关闭RS1(inode2)上的nginx服务

[root@inode2 ~]# nginx -s stop

继续使用inode4上访问

[root@inode4 ~]# curl 10.0.0.101
curl: (7) Failed connect to 10.0.0.101:80; Connection refused
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
curl: (7) Failed connect to 10.0.0.101:80; Connection refused
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
curl: (7) Failed connect to 10.0.0.101:80; Connection refused
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.101
curl: (7) Failed connect to 10.0.0.101:80; Connection refused
[root@inode4 ~]# curl 10.0.0.101
www.ywx2.com

一个访问正常,一个访问报错,因为LVS只是前端调度的功能,没有健康检查。

7、保存lvs规则

[root@node1 ~]# ipvsadm -Sn > /tmp/ipvsadm
[root@node1 ~]# cat /tmp/ipvsadm
-A -t 10.0.0.101:80 -s rr
-a -t 10.0.0.101:80 -r 172.168.1.102:80 -m -w 50
-a -t 10.0.0.101:80 -r 172.168.1.103:80 -m -w 50

8、清空lvs规则并重新导入

#清空ipvsadm规程
[root@node1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.101:80 rr
  -> 172.168.1.102:80             Masq    50     0          0         
  -> 172.168.1.103:80             Masq    50     0          0         
[root@node1 ~]# ipvsadm -C
[root@node1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

#重新导入ipvsadm规则
[root@node1 ~]# ipvsadm -R < /tmp/ipvsadm 
[root@node1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.101:80 rr
  -> 172.168.1.102:80             Masq    50     0          0         
  -> 172.168.1.103:80             Masq    50     0          0         

四、部署单网段LVS DR

1、LVS DR模式注意事项

LVS DR模式工作原理 用户请求LVS VIP到达director(LB均衡器),director将请求的报文的目标MAC 地址改成后端的realserver MAC地址,目标IP为VIP(不变),源IP为用户IP地址 (保持不变),然后Director将报文发送到realserver,Realserver检测到目标IP 为自己本地VIP,如果在同一个网段,然后将请求直接返给用户。如果用户跟 realserver不在一个网段,则通过网关返回用户。

 

DR模式注意事项

1)、LVS DR模式要求LVS和RS服务器同一个物理网段(二层网络);
2)、LVS修改数据报文的目标MAC地址,目标VIP保持不变;
3)、LVS和RS服务器的网卡块数没有要求,单个网卡即可;
4)、RS服务器配置VIP地址,只能配置在LO回环网卡上并且抑制VIP的ARP广播(防止跟其它主机配置的VIP冲突);
5)、LVS服务器需要配置VIP地址,配置在真实网卡设备上,保证真实网卡不能抑制VIP的ARP广播;
6)、arp_ignore参数(1)含义:只响应目标IP是本地真实网卡上配置的IP(对RS而言),只响应真实网卡(eth0、ens33等),不响应lo网卡上的VIP地址;
7)、arp_announce参数(2)含义:忽略报文的源IP地址,使用主机上能够跟用户通信的真实网卡发送数据(对RS而言),源地址为lo上的VIP地址则忽略,数据直接从真实网卡上发送。
DR模型中各主机上均需要配置VIP,解决地址冲突的方式有三种:
(1) 在前端网关做静态绑定
(2) 在各RS使用arptables
(3) 在各RS修改内核参数,来限制arp响应和通告的级别
限制响应级别:arp_ignore
0:默认值,表示可使用本地任意接口上配置的任意地址进行响应
1:仅在请求的目标IP配置在本地主机的接收到请求报文的接口上时,才给予响应
限制通告级别:arp_announce
0:默认值,把本机所有接口的所有信息向每个接口的网络进行通告
1:尽量避免将接口信息向非直接连接网络进行通告
2:必须避免将接口信息向非本网络进行通告
配置要点
1. Director 服务器采用双IP桥接网络,一个是VIP,一个DIP
2. Web服务器采用和DIP相同的网段和Director连接
3. 每个Web服务器配置VIP
4. 每个web服务器可以出外网

2、实验环境

 

[root@inode1 ~]# uname -r
3.10.0-862.el7.x86_64
[root@inode1 ~]# cat /etc/redhat-release 
CentOS Linux release 7.5.1804 (Core) 

LVS inode1:10.0.0.101
RS1 inode2:10.0.0.102 -----> 页面 www.ywx1.com
RS2 inode3:10.0.0.103 -----> 页面 www.ywx2.com
VIP 10.0.0.111

client:172.168.1.104  GW:172.168.1.105
rouer: 172.168.1.105   10.0.0.105

3、router和client部署及LVS RS1 RS2的ip

Router部署

echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
sysctl -p
cd /etc/sysconfig/network-scripts/
[root@node5 network-scripts]# cat ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.105"
PREFIX="24"
GATEWAY="10.0.0.254"
DNS1="223.5.5.5"

[root@node5 network-scripts]# cat ifcfg-eth1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=172.168.1.105
PREFIX=24

Client部署

[root@node4 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=172.168.1.104
PREFIX=24
GAREWAY=172.168.1.105

LVS node1 ip

[root@node1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.101"
PREFIX="24"
GATEWAY="10.0.0.105"
DNS1="223.5.5.5"

RS1 node2 ip

[root@node2 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.102"
PREFIX="24"
GATEWAY="10.0.0.105"
DNS1="223.5.5.5"

RS2 node3 ip

[root@node3 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.103"
PREFIX="24"
GATEWAY="10.0.0.105"
DNS1="223.5.5.5"

4、部署RS1和RS2的nginx

[root@inode2 ~]# curl 10.0.0.102
www.ywx1.com

[root@inode3 ~]# curl 10.0.0.103
www.ywx2.com

5、在部署LVS

第一步:安装LVS

yum install -y ipvsadm

第二步:把10.0.0.111作为VIP,加入lvs集群

ipvsadm -A -t 10.0.0.111 -s rr

第三步:把RS1 inode2和RS2 inode3加入lvs集群

ipvsadm -a -t 10.0.0.111:80 -r 10.0.0.102:80 -g -w 50
ipvsadm -a -t 10.0.0.111:80 -r 10.0.0.103:80 -g -w 50

查看ipvsadm

[root@node1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.111:80 rr
  -> 10.0.0.102:80                Route   50     0          0         
  -> 10.0.0.103:80                Route   50     0          0     

第四步:DR inode1 上绑定VIP地址

方法一:

ifconfig eth0:0 10.0.0.111 netmask 255.255.255.255 broadcast 10.0.0.111
 /sbin/route  add  -host  10.0.0.111  dev  eth0:0

方法二:

cd /etc/sysconfig/network-scripts/
cp ifcfg-eth0 ifcfg-eth0:0
vim ifcfg-eth0:0
TYPE=Ethernet
BOOTPROTO=static
DEVICE=eth0:0
ONBOOT=yes
IPADDR=10.0.0.111
NETMASK=255.255.255.255

第五步:RS1 inode2和RS2 inode3上绑定VIP地址

方法一:

 ifconfig lo:0 10.0.0.111 netmask 255.255.255.255 broadcast 10.0.0.111
 /sbin/route  add  -host  10.0.0.111 dev  lo:0

方法二:

cd /etc/sysconfig/network-scripts/
cp ifcfg-lo ifcfg-lo:0
vim ifcfg-lo:0

DEVICE=lo:0
IPADDR=10.0.0.111
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback

第六步:在RS1 inode2和RS2 inode3上配置arp抑制

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p 
cat /proc/sys/net/ipv4/conf/lo/arp_ignore
cat /proc/sys/net/ipv4/conf/lo/arp_announce
cat /proc/sys/net/ipv4/conf/all/arp_ignore
cat /proc/sys/net/ipv4/conf/all/arp_announce

第七步:测试

在inode4上访问VIP

[root@inode4 ~]# curl 10.0.0.111
www.ywx1.com
[root@inode4 ~]# curl 10.0.0.111
www.ywx2.com
[root@inode4 ~]# curl 10.0.0.111
www.ywx1.com
[root@inode4 ~]# curl 10.0.0.111
www.ywx2.com

五、部署多网段LVS DR

 

多网段LVS DR是vip与RIP不在同一个网段

[root@inode1 ~]# uname -r
3.10.0-862.el7.x86_64
[root@inode1 ~]# cat /etc/redhat-release 
CentOS Linux release 7.5.1804 (Core) 

LVS inode1:10.0.0.101
RS1 inode2:10.0.0.102 -----> 页面 www.ywx1.com
RS2 inode3:10.0.0.103 -----> 页面 www.ywx2.com
VIP 192.168.1.100

client:172.168.1.104  GW:172.168.1.105
rouer: 172.168.1.105   10.0.0.105  192.168.1.200(与vip通信使用)

1、router和client部署及LVS RS1 RS2的ip

Router部署

echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
sysctl -p
cd /etc/sysconfig/network-scripts/
[root@node5 network-scripts]# cat ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.105"
PREFIX="24"
GATEWAY="10.0.0.254"
DNS1="223.5.5.5"

[root@node5 network-scripts]# cat ifcfg-eth1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=172.168.1.105
PREFIX=24

#在eth0:0上配置192.168.1.200
ifconfig eth0:0 192.168.1.200 netmask 255.255.255.0 broadcast 192.168.1.200
 /sbin/route  add  -host  192.168.1.200 dev  eth0:0
 
 [root@node5 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:f5:01:8d brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.105/24 brd 10.0.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet 192.168.1.200/32 brd 192.168.1.200 scope global eth0:0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fef5:18d/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:f5:01:97 brd ff:ff:ff:ff:ff:ff
    inet 172.168.1.105/24 brd 172.168.1.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fef5:197/64 scope link 
       valid_lft forever preferred_lft forever

Client部署

[root@node4 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=172.168.1.104
PREFIX=24
GAREWAY=172.168.1.105

LVS node1 ip

[root@node1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.101"
PREFIX="24"
GATEWAY="10.0.0.105"
DNS1="223.5.5.5"

RS1 node2 ip

[root@node2 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.102"
PREFIX="24"
GATEWAY="10.0.0.105"
DNS1="223.5.5.5"

RS2 node3 ip

[root@node3 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR="10.0.0.103"
PREFIX="24"
GATEWAY="10.0.0.105"
DNS1="223.5.5.5"

2、RS1和RS2部署nginx

[root@inode2 ~]# curl 10.0.0.102
www.ywx1.com

[root@inode3 ~]# curl 10.0.0.103
www.ywx2.com

  

3、DR inode1 上绑定VIP地址

方法一:

ifconfig lo:1 192.168.1.100 netmask 255.255.255.255 broadcast 192.168.1.100
 /sbin/route  add  -host  192.168.1.100  dev  lo:1

方法二:

cd /etc/sysconfig/network-scripts/
cp ifcfg-lo ifcfg-lo:1
vim ifcfg-lo:1
DEVICE=lo:1
IPADDR=192.168.1.100
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback

4、RS1 inode2和RS2 inode3上绑定VIP地址

方法一:

 ifconfig lo:1 192.168.1.100 netmask 255.255.255.255 broadcast 192.168.1.100
 /sbin/route  add  -host  192.168.1.100 dev  lo:1

方法二:

cd /etc/sysconfig/network-scripts/
cp ifcfg-lo ifcfg-lo:1
vim ifcfg-lo:1

DEVICE=lo:1
IPADDR=192.168.1.100
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback

5、在RS1 inode2和RS2 inode3上配置arp抑制

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p 
cat /proc/sys/net/ipv4/conf/lo/arp_ignore
cat /proc/sys/net/ipv4/conf/lo/arp_announce
cat /proc/sys/net/ipv4/conf/all/arp_ignore
cat /proc/sys/net/ipv4/conf/all/arp_announce

6、在DR inode1上部署LVS

第一步:安装LVS

yum install -y ipvsadm

第二步:把192.168.1.100作为VIP,加入lvs集群

ipvsadm -A -t 192.168.1.100 -s rr

第三步:把RS1 inode2和RS2 inode3加入lvs集群

ipvsadm -a -t 192.168.1.100:80 -r 10.0.0.102:80 -g -w 50
ipvsadm -a -t 192.168.1.100:80 -r 10.0.0.103:80 -g -w 50

查看ipvsadm

[root@node1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.100:80 rr
  -> 10.0.0.102:80                Route   50     0          0         
  -> 10.0.0.103:80                Route   50     0          0     

7、测试

[root@node4 ~]# curl 192.168.1.100
www.ywx2.com
[root@node4 ~]# curl 192.168.1.100
www.ywx1.com
[root@node4 ~]# curl 192.168.1.100
www.ywx2.com
[root@node4 ~]# curl 192.168.1.100
www.ywx1.com

8、lvs_dr脚本

lvs_dr_vs.sh

#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip='192.168.1.100'
iface='lo:1'
mask='255.255.255.255'
port='80'
rs1='10.0.0.102'
rs2='10.0.0.103'
scheduler='wrr'
type='-g'
rpm -q ipvsadm &> /dev/null || yum -y install ipvsadm &> /dev/null
case $1 in
start)
ifconfig $iface $vip netmask $mask #broadcast $vip up
iptables -F
ipvsadm -A -t ${vip}:${port} -s $scheduler
ipvsadm -a -t ${vip}:${port} -r ${rs1} $type -w 1
ipvsadm -a -t ${vip}:${port} -r ${rs2} $type -w 1
echo "The VS Server is Ready!"
;;
stop)
ipvsadm -C
ifconfig $iface down
echo "The VS Server is Canceled!"
;;
*)
echo "Usage: $(basename $0) start|stop"
exit 1
;;
esac

lvs_dr_rs

#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip=192.168.1.100
mask='255.255.255.255'
dev=lo:1
#rpm -q httpd &> /dev/null || yum -y install httpd &>/dev/null
#service httpd start &> /dev/null && echo "The httpd Server is Ready!"
#echo "`hostname -I`" > /var/www/html/index.html
case $1 in
start)
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
ifconfig $dev $vip netmask $mask #broadcast $vip up
echo "The RS Server is Ready!"
;;
stop)
ifconfig $dev down
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "The RS Server is Canceled!"
;;
*)
echo "Usage: $(basename $0) start|stop"
exit 1
;;
esac

 

posted @ 2020-09-16 08:29  yaowx  阅读(1891)  评论(0编辑  收藏  举报