运维项目实训 - LVS(DR)负载均衡模式

LVS：实现real server的负载均衡
Keepalived：实现两节点的高可用，并监控Real server，屏蔽故障节点，将出现故障的节点从策略中移除
实验配置环境

1.sever1
1、安装ipvsadm
修改yum源

cd /etc/yum.repo/rhel.dvd.repo
[rhel-source]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=http://172.25.12.250/rhel6.5
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

[LoadBalancer]
name=LoadBalancer
gpgcheck=0
baseurl=http://172.25.12.250/rhel6.5/LoadBalancer

[HighAvailability]
name=HighAvailability
gpgcheck=0
baseurl=http://172.25.12.250/rhel6.5/HighAvailability

[ResilientStorage]
name=ResilientStorage
gpgcheck=0
baseurl=http://172.25.12.250/rhel6.5/ResilientStorage

[ScalableFileSystem]
name=ScalableFileSystem
gpgcheck=0
baseurl=http://172.25.12.250/rhel6.5/ScalableFileSystem

注意：rhel6：需要对yum源配置；rhel7：不需要

1.2、配置虚拟IP（vip）sever1

[root@server1 ~]# ip addr add 172.25.254.151/24 dev eth4
[root@server1 ~]# ipvsadm -A -t 172.25.254.151:80 -s rr
[root@server1 ~]# ipvsadm -a -t 172.25.254.151:80 -r 172.25.254.2:80 -g
[root@server1 ~]# ipvsadm -a -t 172.25.254.151:80 -r 172.25.254.3:80 -g
[root@server1 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.25.254.100:http rr
  -> server2:http                 Route   1      0          0         
  -> server3:http                 Route   1      0          0  
[root@server1 ~]# /etc/init.d/ipvsadm save 
ipvsadm: Saving IPVS table to /etc/sysconfig/ipvsadm:      [  OK  ]

2.sever2主机
下载 httpd iptables_jf -y 后配置

[root@server2 ~]# yum install httpd -y
[root@server2 ~]# /etc/init.d/httpd start
[root@server2 ~]# curl 172.25.51.2
<h1>server3</h1>
[root@server2 ~]# ip addr add 172.25.51.100/32 dev eth4
[root@server2 ~]# arptables -A IN -d 172.25.51.100 -j DROP
[root@server2 ~]# arptables -A OUT -s 172.25.51.100 -j mangle --mangle-ip-s 172.25.51.2

[root@server2 ~]# /etc/init.d/arptables_jf save 
Saving current rules to /etc/sysconfig/arptables:          [  OK  ]

sever3主机
下载 httpd iptables_jf -y 后配置

[root@server3: ~]#  yum install httpd arptables_jf -y
[root@server3: ~]# /etc/init.d/httpd start
[root@server3: html]# curl localhost
<h1>server3</h1>
[root@server3: ~]# ip addr add 172.25.51.100/32 dev eth4
[root@server3: ~]# arptables -A IN -d 172.25.51.100 -j DROP
[root@server3: ~]# arptables -A OUT -s 172.25.51.100 -j mangle --mangle-ip-s 172.25.51.3
[root@server3: ~]# /etc/init.d/arptables_jf save
Saving current rules to /etc/sysconfig/arptables:          [  OK  ]

试验：
物理主机
1、访问 172.25.51.100 实现负载均衡

[kiosk@foundation12 rhel6.5]$ curl 172.25.51.100
<h1>server3</h1>
[kiosk@foundation12 rhel6.5]$ curl 172.25.51.100
<h1>server2</h1> 
[kiosk@foundation12 rhel6.5]$ curl 172.25.51.100
<h1>server3</h1>
[kiosk@foundation12 rhel6.5]$ curl 172.25.51.100
<h1>server2</h1>