Keepalived+LVS-DR模式高可用负载均衡集群的搭建

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主机环境 redhat6.5 64位

实验环境 服务端1 ip 172.25.25.113  主机名：server3.example.com   

         服务端2 ip 172.25.25.114  主机名：server4.example.com

         管理端2 ip 172.25.25.112  主机名：server2.example.com

         管理端1 ip 172.25.25.111  主机名：server1.example.com

防火墙状态：关闭

虚拟ip（vip）： 172.25.25.200/24

 


前面的博文中已经介绍过将DR添加到高可用集群（HA）的heartbeat中避免单点故障，本节将介绍将另一个避免单点故障的方法：将DR添加到HA的keepalived中。keepalived对后端有健康检查，则在安装好keepalived之后可直接添加DR。

本节将不再介绍DR的配置，感兴趣的可查看前面的博文，本文直接从keeepalived的安装开始。


在Keepalived.org官网可下载leepalived压缩包（keeepalived对后端有健康检查）

1.源码安装keepalived

[[email protected] mnt]# ls

keepalived-1.2.24.tar.gz

[[email protected] mnt]# tar zxf keepalived-1.2.24.tar.gz        #解压

keepalived-1.2.24

keepalived-1.2.24.tar.gz

[[email protected] mnt]# cd keepalived-1.2.24

[[email protected] keepalived-1.2.24]# ls

aclocal.m4  ChangeLog     CONTRIBUTORS  genhash    keepalived.spec.in  missing

ar-lib       compile       COPYING       INSTALL     lib                 README

AUTHOR      configure     depcomp       install-sh  Makefile.am         TODO

bin_install configure.ac  doc           keepalived  Makefile.in

[[email protected] keepalived-1.2.24]# ./configure--prefix=/usr/local/keepalived

若有以下错误

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则安装

[[email protected] keepalived-1.2.24]# yum installopenssl-devel.x86_64 -y

[[email protected] keepalived-1.2.24]# ./configure--prefix=/usr/local/keepalived

[[email protected] keepalived-1.2.24]# make

[[email protected] keepalived-1.2.24]# make install

[[email protected] keepalived-1.2.24]# cd /usr/local/

[[email protected] local]# ls

bin  etc  games include  keepalived  lib lib64  libexec  sbin share  src

[[email protected] local]# scp -r keepalived/172.25.25.112:/usr/local/

[email protected]‘s password:

 #作软连接

[[email protected] local]# ln -s/usr/local/keepalived/etc/keepalived/ /etc/ #主配置文件的软链接

[[email protected] local]# ln -s/usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/    #启动脚本的软链接

[[email protected] local]# chmod +x /etc/init.d/keepalived       #改变脚本的权限

[[email protected] local]# ln -s/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/     #配置文件的软链接

[[email protected] local]# ln -s/usr/local/keepalived/sbin/keepalived /sbin/ #二进制文件的软链接

[[email protected] local]# /etc/init.d/keepalived start  #测试，开启

Starting keepalived:                                       [  OK  ]

[[email protected] local]# /etc/init.d/keepalived stop

Stopping keepalived:                                       [  OK  ]

[[email protected] local]#

 

2.将DR添加到keepalived及测试（管理端）

 1.添加DR到keepalived

[[email protected] local]# cd /etc/keepalived/

[[email protected] keepalived]# ls

keepalived.conf  samples

[[email protected] keepalived]# vim keepalived.conf  #进入主配置文件

  1 ! Configuration Filefor keepalived

  2

  3 global_defs {

  4    notification_email {

  5         [email protected]      #邮件接受端

  6    }

  7    notification_email_from [email protected]      #邮件发送端

  8    smtp_server 127.0.0.1    #本地回环

  9    smtp_connect_timeout 30      #连接超时

 10    router_id LVS_DEVEL

 11    vrrp_skip_check_adv_addr

 12    vrrp_strict

 13    vrrp_garp_interval 0

 14    vrrp_gna_interval 0

 15 }

 16

 17 vrrp_instance VI_1 {

 18     state MASTER        #服务端1是master

 19     interface eth0      #进入接口eth0

 20     virtual_router_id 25    #虚拟路由id（1-254之间）

 21     priority 100            #在启动keepalived服务时，系统会比较priority的值，哪个值大哪个就是master

 22     advert_int 1

 23     authentication {

 24         auth_type PASS

 25         auth_pass 1111

 26     }

 27     virtual_ipaddress {

 28         172.25.25.200   #虚拟ip‘

 29     }

 30 }

 31

 32 virtual_server172.25.25.200 80 {  #虚拟服务

 33     delay_loop 6

 34     lb_algo rr

 35     lb_kind DR          #DR

 36 #    persistence_timeout 50    #超时

 37     protocol TCP

 38

 39     real_server 172.25.25.113 80 {      #真正的服务端

 40         weight 1        #权重

 41         TCP_CHECK {

 42             connect_timeout 3

 43             nb_get_retry 3

 44             delay_before_retry 3

 45         }

 46     }

 47      real_server 172.25.25.114 80 {     #真正的服务端

 48         weight 1

 49         TCP_CHECK {

 50             connect_timeout 3

 51             nb_get_retry 3

 52             delay_before_retry 3

 53         }

 54     }

 55

 56 }

[[email protected] keepalived]# /etc/init.d/keepalived start   #开启（服务端1）

Starting keepalived:                                       [  OK  ]

 

[[email protected] keepalived]# scp keepalived.conf172.25.25.112:/etc/keepalived/

[email protected]‘s password:      #将其传到服务端2

keepalived.conf                                   100%1049     1.0KB/s   00:00 

[[email protected] keepalived]# vim keepalived.conf  #进入刚传到服务端2文件，修改

 7    notification_email_from [email protected]#邮件发送段，本机

18     state BACKUP     #备服务器

2[[email protected] local]# /etc/init.d/keepalived start     #开启（服务端2）

Starting keepalived:                                       [  OK  ]

1     priority 88           #比主的数值小就可以

 

  2.测试

[[email protected] keepalived]# ipvsadm -l

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

  ->RemoteAddress:Port           ForwardWeight ActiveConn InActConn

TCP  172.25.25.200:httprr

  ->server3.example.com:http     Route   1     0          0        

  ->172.25.25.114:http           Route   1     0          0    

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#刷新之后，服务端2

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[[email protected] keepalived]# ip addr show   #查看ip，虚拟ip在服务端1

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

    link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8scope host lo

    inet6 ::1/128 scopehost

       valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

    link/ether 52:54:00:ec:8b:36brd ff:ff:ff:ff:ff:ff

    inet 172.25.25.111/24brd 172.25.25.255 scope global eth0

    inet 172.25.25.200/32scope global eth0     #虚拟ip

    inet6fe80::5054:ff:feec:8b36/64 scope link

       valid_lft foreverpreferred_lft forever

 

当主机keepalived停掉，系统会将服务转移到备机上；当主机重新打开时，系统会重新读配置文件，来确定主机和备机，将服务开启到主机上

 

#将服务端1的keepalived停掉，测试

[[email protected] keepalived]# /etc/init.d/keepalived stop

Stopping keepalived:                                       [  OK  ]

#服务正常

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#刷新之后，服务端2

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[[email protected] keepalived]# ip addr show    #查看，虚拟ip不在服务端1

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

    link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8scope host lo

    inet6 ::1/128 scopehost

       valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

    link/ether52:54:00:ec:8b:36 brd ff:ff:ff:ff:ff:ff

    inet 172.25.25.111/24brd 172.25.25.255 scope global eth0

    inet6fe80::5054:ff:feec:8b36/64 scope link

       valid_lft foreverpreferred_lft forever

 

[[email protected] keepalived]# ip addr show  #查看ip虚拟在服务端2

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

    link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scopehost lo

    inet6 ::1/128 scopehost

       valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

    link/ether52:54:00:85:1a:3b brd ff:ff:ff:ff:ff:ff

    inet 172.25.25.112/24brd 172.25.25.255 scope global eth0

    inet 172.25.25.200/32scope global eth0     #虚拟ip

    inet6fe80::5054:ff:fe85:1a3b/64 scope link

       valid_lft foreverpreferred_lft forever

 

#将服务端1的keepalived开启

[[email protected] keepalived]# /etc/init.d/keepalived start

Starting keepalived:                                       [  OK  ]

#服务正常运行

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#刷新之后，服务端2

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[[email protected] keepalived]# ip addr show     #查看虚拟ip，回到服务端1

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

    link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8scope host lo

    inet6 ::1/128 scopehost

       valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

    link/ether52:54:00:ec:8b:36 brd ff:ff:ff:ff:ff:ff

    inet 172.25.25.111/24brd 172.25.25.255 scope global eth0

    inet 172.25.25.200/32scope global eth0     #虚拟ip

    inet6fe80::5054:ff:feec:8b36/64 scope link

       valid_lft foreverpreferred_lft forever

[[email protected] keepalived]# ip addr show    #查看，服务端2上没有虚拟ip

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

    link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8scope host lo

    inet6 ::1/128 scopehost

       valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

    link/ether52:54:00:85:1a:3b brd ff:ff:ff:ff:ff:ff

    inet 172.25.25.112/24brd 172.25.25.255 scope global eth0

    inet6fe80::5054:ff:fe85:1a3b/64 scope link

       valid_lft foreverpreferred_lft forever

 


本文出自 “不忘初心，方得始终” 博客，请务必保留此出处http://12087746.blog.51cto.com/12077746/1863139

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