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LVS之六:使用keepalived实现LVS的DR模式热备
2013年10月08日 服务器集群技术 ⁄ 共 5385字 评论数 8 ⁄ 被围观 18,278 views+

一、说明:

在《LVS之一:三种工作模式的优缺点比较(NAT/TUN/DR)》文章讲述了LVS的三种转发模式对比,我们先就用LVS的DR模式来实现Web应用的负载均衡。为了防止LVS服务器自身的单点故障导致整个Web应用无法提供服务,因此还得利用Keepalived实现lvs的高可用性,keepalived主要使用VRRP协议来保存链路的高可用性。而VRRP(Virtual Router Redundancy Protocol)协议本身是用于实现路由器冗余的协议。

LVS-DR模式的原理如下(借用别人的图):

lvs-DR模式原理图

即客户端访问VIP(域名解析到VIP),LVS接收情况后根据负载均衡调度算法,转发请求到真实服务器,真实服务器接收到客户端请求后,将处理结果直接返回给客户端。

二、网络拓扑及IP规划:

lvs-DR网络拓扑

说明:

1、  LVS服务器和WEB服务器必须在同一网段;

2、  多台Web服务器间使用NFS服务器等共享存储存放用户上传附件,以保障数据的一致性(如上传图片)。下文讨论

IP地址规划:

VIP              192.168.18.60

LVS-MASTER     192.168.18.51

LVS-BACKUP     192.168.18.52

NFS   Server       192.168.18.20

MySQL               192.168.18.18

WEB1        192.168.18.61

WEB2        192.168.18.62

三、安装LVS+Keepalived:

1、使用yum在线安装:

[root@lvs1 ~]# yum install ipvsadm  keepalived –y

2、检查安装结果:

[root@lvs1 ~]# rpm -qa |grep ipvsadm

ipvsadm-1.25-10.el6.x86_64

[root@lvs1 ~]# rpm -qa |grep keepalived

keepalived-1.2.7-3.el6.x86_64

3、服务配置:

[root@lvs1 ~]# chkconfig keepalived on   ##设置为开机启动

[root@lvs1 ~]# service keepalived start   ##立即启动keepalived服务

四、配置LVS服务器:

1、  备份配置文件:

[root@lvs1 ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.bak

2、  修改配置文件,具体如下:

原始的配置文件包含了三种模式的配置,而这里我们只需要用到DR模式,因此最终保留配置如下:

[root@lvs1 ~]#  vim /etc/keepalived/keepalived.conf

global_defs {                       ##全局配置部分

#   notification_email {             ##下面几行均为全局通知配置,可以实现出现问题后报警,但功能有限,因此注释掉,并采用Nagios监视lvs运行情况

#       admin@toxingwang.com

#   }

#   notification_email_from master@toxingwang.com

#   smtp_server smtp.exmail.qq.com

#   smtp_connect_timeout 30

router_id LVS_MASTER             ##设置lvs的id,在一个网络内应该是唯一的

}

vrrp_instance VI_1 {            ##设置vrrp组,唯一且同一LVS服务器组要相同

state MASTER             ##备份LVS服务器设置为BACKUP

interface eth0             # #设置对外服务的接口

virtual_router_id 51        ##设置虚拟路由标识

priority 100                                    #设置优先级,数值越大,优先级越高,backup设置为99,这样就能实现当master宕机后自动将backup变为master,而当原master恢复正常时,则现在的master再次变为backup。

advert_int 1            ##设置同步时间间隔

authentication {         ##设置验证类型和密码,master和buckup一定要设置一样

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {          ##设置VIP,可以多个,每个占一行

192.168.18.60

}

}

virtual_server 192.168.18.60 80 {

delay_loop 6            ##健康检查时间间隔,单位s

lb_algo wrr             ##负载均衡调度算法设置为加权轮叫

lb_kind DR                              ##负载均衡转发规则

nat_mask 255.255.255.0   ##网络掩码,DR模式要保障真是服务器和lvs在同一网段

persistence_timeout 50    ##会话保持时间,单位s

protocol TCP                           ##协议

real_server 192.168.18.61 80 {      ##真实服务器配置,80表示端口

weight 3                              ##权重

TCP_CHECK {                       ##服务器检测方式设置

connect_timeout 5    ##连接超时时间

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

}

real_server 192.168.18.62 80 {

weight 3

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

}

}

作为高可用的备份lvs服务器配置只需在上述配置中的master修改backup即可,其他保持相同。

3、  分别在两台lvs服务器上重启服务:

[root@lvs1 ~]# service keepalived start

注:由于keepalived配置文件有语法错误也能启动,因此看到启动了lvs服务,不代表配置文件没有错误,如果遇到lvs不能正常转发,及时跟踪日志进行处理。

日志跟踪方法:

1、开两个ssh窗口连接到lvs服务器,第一个窗口运行如下命令:

[root@lvs1 ~]# tail -F /var/log/message

2、第二个窗口重新启动keepalived服务,同时观察窗口1中日志的变化,然后根据日志提示解决即可。

五、WEB服务器IP绑定配置:

在两台WEB服务器安装并配置(非本文重点,不做web安装配置讲解),建立测试网页,先使用实际IP进行访问测试,能正常访问后,进行如下操作:

在前面的文章中介绍DR模式时提到:负载均衡器也只是分发请求,应答包通过单独的路由方法返回给客户端。但实际上客户端访问时,IP都是指向的负载均衡器的ip(也就是LVS的VIP),如何能让真是服务器处理IP头为VIP的请求,这就需要做下面的操作,将VIP绑定到真实服务器的lo网口(回环),为了防止IP广播产生IP冲突,还需关闭IP广播,具体如下:

1、编辑开机启动脚本:

  [root@web1 ~]# vim /etc/init.d/realserver

#!/bin/bash

#chkconfig: 2345 79 20

#description:realserver

SNS_VIP=192.168.18.60

. /etc/rc.d/init.d/functions

case "$1" in

start)

ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

/sbin/route add -host $SNS_VIP dev lo:0

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 >/dev/null 2>&1

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

route del $SNS_VIP >/dev/null 2>&1

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

echo "RealServer Stoped"

;;

*)

echo "Usage: $0 {start|stop}"

exit 1

esac

exit 0

脚本说明:

arp_ignore: 定义接收到ARP请求时的响应级别;

0:只要本地配置的有相应地址,就给予响应;默认;

1:仅在请求的目标地址配置在到达的接口上的时候,才给予响应;

arp_announce:定义将自己地址向外通告时的通告级别;

0:将本地任何接口上的任何地址向外通告;默认;

1:试图仅向目标网络通告与其网络匹配的地址;

2:仅向与本地接口上地址匹配的网络进行通告;

2、  设置脚本开机启动并立即启动:

[root@web1 ~]# chkconfig realserver on

[root@web1 ~]# service realserver start

RealServer Start OK

3、  检测IP配置:

[root@web1 ~]# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:50:56:B3:54:5A

inet addr:192.168.18.61  Bcast:192.168.18.255  Mask:255.255.255.0

inet6 addr: fe80::250:56ff:feb3:545a/64 Scope:Link

UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

RX packets:98940 errors:4 dropped:4 overruns:0 frame:0

TX packets:82037 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:23077218 (22.0 MiB)  TX bytes:16043349 (15.3 MiB)

Interrupt:18 Base address:0x2000

 

lo        Link encap:Local Loopback

inet addr:127.0.0.1  Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING  MTU:16436  Metric:1

RX packets:300 errors:0 dropped:0 overruns:0 frame:0

TX packets:300 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:528420 (516.0 KiB)  TX bytes:528420 (516.0 KiB)

 

lo:0      Link encap:Local Loopback

inet addr:192.168.18.60  Mask:255.255.255.255

UP LOOPBACK RUNNING  MTU:16436  Metric:1

4、  测试LVS:

在lvs master服务器上运行如下命令:

[root@lvs1 ~]# watch -n 1 ipvsadm -ln

在多台客户端通过浏览器访问VIP或域名(域名需解析到VIP),看能否获取到正确的页面,且同时观察上述窗口的变化。

lvs

 

从上图(为了方便观察,使用了压力测试)可以看出,访问被正常的分担到了两台后端web服务器 。

六、后继问题探讨:

1、用户新上传的附件存放问题;目前我们采用的是NFS方式解决,但存在单点故障,需要配合其他方式解决。NFS的基本用法请参考《NFS的配置和使用

2、后端数据库高可用性;

3、会话共享和保持问题(Session共享);算法调整为SH可解决,但有RealServer宕机时,其上的session也会丢失。后期将调整为实现共享session。

 

目前有 8 条留言 其中:访客:8 条, 博主:0 条

  1. yichunlan99 : 2016年09月22日15:03:15  -49楼 @回复 回复

    很受用,谢谢

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  3. Lise Winicki : 2017年05月20日14:10:17  -47楼 @回复 回复

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  4. DAN ANTON: BACKLINKSVAULT and BrandlinksRank : 2017年05月20日14:12:48  -46楼 @回复 回复

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  5. Auto Connection : 2017年05月20日14:13:33  -45楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  6. Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  7. conslines.com : 2017年05月20日14:14:04  -43楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  8. Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

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