Apache+lvs高可用+keepalive(主从+双主模型)

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4.简单修改一下slave配置文件

[root@node18 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

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global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

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vrrp_instance VI_1 {

state BACKUP #配置模式 #修改为BACKUP

interface eth0

virtual_router_id 51

priority 100 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

}

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virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

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real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

}

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#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

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# sorry_server 192.168.200.200 1358

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# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

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#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

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# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

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5.启动master与slave的keepalived服务

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[root@node17 ~]# service keepalived start

Starting keepalived:

[root@node18 ~]# service keepalived start

Starting keepalived: [ OK ]

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6.查看一下LVS状态

[root@node17 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.16.21.100:80 rr

-> 172.16.21.15:80 Route 1 0 0

-> 172.16.21.16:80 Route 1 0 0

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[root@node18 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.16.21.100:80 rr

-> 172.16.21.15:80 Route 1 0 0

-> 172.16.21.16:80 Route 1 0 0

7.测试

8.模拟故障

(1).停止一下node15上的httpd

[root@node15 ~]# service httpd stop

Stopping httpd:

(2).查看一下的lvs(master)

[root@node17 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.16.21.100:80 rr

-> 172.16.21.16:80 Route 1 0 0

You have mail in /var/spool/mail/root

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(3).测试一下

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(4).查看一下邮件

[root@node17 ~]# mail

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(5).重新启动一下node15上的httpd

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(6).再查看一下lvs状态(master)

[root@node17 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.16.21.100:80 rr

-> 172.16.21.15:80 Route 1 0 0

-> 172.16.21.16:80 Route 1 0 0

You have new mail in /var/spool/mail/root

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(7).再查看一下邮件

[root@node17 ~]# mail

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(8).关闭master上keepalived

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[root@node17 ~]# service keepalived stop

Stopping keepalived: [ OK ]

[root@node17 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

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(9).查看一下slave状态

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[root@node18 ~]# ip addr show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

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 qlen 1000

link/ether 00:0c:29:15:10:48 brd ff:ff:ff:ff:ff:ff

inet 172.16.21.18/16 brd 172.16.255.255 scope global eth0

inet 172.16.21.100/32 scope global eth0

inet6 fe80::20c:29ff:fe15:1048/64 scope link

valid_lft forever preferred_lft forever

3: pan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN

link/ether 0a:6b:ef:b8:23:05 brd ff:ff:ff:ff:ff:ff

You have new mail in /var/spool/mail/root

[root@node18 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.16.21.100:80 rr

-> 172.16.21.15:80 Route 1 0 0

-> 172.16.21.16:80 Route 1 0 0

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(10).再次测试一下

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注，大家可以看到，经过上面的演示我们现在LVS的高可用即前端负载均衡的高可用，同时实现对后端realserver监控，也实现后端realserver宕机时会给管理员发送邮件。但还有几个问题我们还没有解决，问题如下:

• 所有realserver都down机，怎么处理？是不是用户就没法打开，还是提供一下维护页面。

• 怎么完成维护模式keepalived切换？
• 如何在keepalived故障时，发送警告邮件给指定的管理员？
• 9.所有realserver都down机，怎么处理？
• 问 题：在集群中如果所有real server全部宕机了，客户端访问时就会出现错误页面，这样是很不友好的，我们得提供一个维护页面来提醒用户，服务器正在维护，什么时间可以访问等，下 面我们就来解决一下这个问题。解决方案有两种，一种是提供一台备用的real server当所有的服务器宕机时，提供维护页面，但这样做有点浪费服务器。另一种就是在负载均衡器上提供维护页面，这样是比较靠谱的，也比较常用。下面 我们就来具体操作一下。

(1).master(node17)与slave(node18)安装上httpd

[root@node17 ~]# yum -y install httpd

[root@node18 ~]# yum -y install httpd

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(2).配置维护页面

[root@node17 ~]# vim /var/www/html/index.html

Website is currently under maintenance, please come back later!

[root@node18 ~]# vim /var/www/html/index.html

Website is currently under maintenance, please come back later!

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(3).启动httpd服务并测试

[root@node17 ~]# service httpd start

Starting httpd: [ OK ]

[root@node18 ~]# service httpd start

Starting httpd: [ OK ]

(4).修改配置文件

master(node17):

[root@node17 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

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global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

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vrrp_instance VI_1 {

state MASTER #配置模式

interface eth0

virtual_router_id 51

priority 101 #配置优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

}

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virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

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real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

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#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

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# sorry_server 192.168.200.200 1358

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# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

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#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

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# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

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slave(node18):

[root@node18 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

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global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

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vrrp_instance VI_1 {

state BACKUP #配置模式 #修改为BACKUP

interface eth0

virtual_router_id 51

priority 100 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

}

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virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

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real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

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#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

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# sorry_server 192.168.200.200 1358

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# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

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#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

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# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

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(5).关闭所有的real server并重新启动一下master与slave的keepalived

[root@node15 ~]# service httpd stop

Stopping httpd: [ OK ]

[root@node16 ~]# service httpd stop

Stopping httpd: [ OK ]

[root@node17 ~]# service keepalived restart

Stopping keepalived: [ OK ]

Starting keepalived: [ OK ]

[root@node18 ~]# service keepalived restart

Stopping keepalived: [ OK ]

Starting keepalived: [ OK ]

(6).查看一下lvs

[root@node17 ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.16.21.100:80 rr

-> 127.0.0.1:80 Local 1 0 0

(7).测试

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注，sorry_server测试成功，下面我们继续。

10.怎么完成维护模式keepalived切换？

问 题：我们一般进行主从切换测试时都是关闭keepalived或关闭网卡接口，有没有一种方法能实现在不关闭keepalived下或网卡接口来实现维护 呢？方法肯定是有的，在keepalived新版本中，支持脚本vrrp_srcipt，具体如何使用大家可以man keepalived.conf查看。下面我们来演示一下具体怎么实现。

(1).定义脚本

????vrrp_srcipt chk_schedown {?

???script "[ -e /etc/keepalived/down ] && exit 1 || exit 0"??

???interval 1 #监控间隔??

???weight -5 #减小优先级??

???fall 2 #监控失败次数??

???rise 1 #监控成功次数??

}

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(2).执行脚本

????track_script {

???chk_schedown #执行chk_schedown脚本

????

}

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(3).修改配置文件

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master(node17):只需在原来的配置上增加两处代码，是标记绿色的

????[root@node17 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

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global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

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vrrp_script chk_schedown { #定义vrrp执行脚本

script "[ -e /etc/keepalived/down ] && exit 1 || exit 0" #查看是否有down文件，有就进入维护模式

interval 1 #监控间隔时间

weight -5 #降低优先级

fall 2 #失败次数

rise 1 #成功数次

}

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vrrp_instance VI_1 {

state MASTER #配置模式

interface eth0

virtual_router_id 51

priority 101 #配置优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

track_script { #执行脚本

chk_schedown

???? ?

}

}

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virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

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real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

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connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

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#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

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# sorry_server 192.168.200.200 1358

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# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

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# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

?

# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

slave(node18): 只需在原来的配置上增加三处代码，是标记绿色的

?

[root@node18 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

?

global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_schedown {

script "[ -e /etc/keepalived/down ] && exit 1 || exit 0"

interval 1

weight -5

fall 2

rise 1

}

?

vrrp_instance VI_1 {

state BACKUP #配置模式 #修改为BACKUP

interface eth0

virtual_router_id 51

priority 100 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

track_script {

chk_schedown

}

?

}

?

virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

?

real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

?

#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

?

# sorry_server 192.168.200.200 1358

?

# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

?

# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

?

(4).测试

[root@node17 ~]# cd /etc/keepalived/

[root@node17 keepalived]# touch down

[root@node17 keepalived]# ll

total 8

-rw-r--r-- 1 root root 0 Jan 16 15:14 down

-rw-r--r-- 1 root root 4330 Jan 16 15:10 keepalived.conf

[root@node17 keepalived]# ip add show #查看VIP

?

??

[root@node18 ~]# ip addr show #查看一下VIP已转移到slave上?

?

测试：我再把 /etc/keepalived/ 目录下的down 文件移除或是改变

[root@node17 keepalived]# mv down down.bak

[root@node17 keepalived]# ll

total 8

-rw-r--r-- 1 root root 0 Jan 16 15:14 down.bak

-rw-r--r-- 1 root root 4330 Jan 16 15:10 keepalived.conf

?

[root@node17 keepalived]# ip addr show #查看一下VIP又回到master上?

好了，自写监测脚本，完成维护模式切换，到这里就演示成功，下面我们来解决最后一个问题，就是keepalived主从切换的邮件通告。

?

?

?

?

11.如何在keepalived故障时(或主备切换时)，发送警告邮件给指定的管理员？

(1).keepalived通知脚本进阶示例

下面的脚本可以接受选项，其中

• -s, --service SERVICE,...：指定服务脚本名称，当状态切换时可自动启动、重启或关闭此服务；
• -a, --address VIP: 指定相关虚拟路由器的VIP地址；
• -m, --mode {mm|mb}：指定虚拟路由的模型，mm表示主主，mb表示主备；它们表示相对于同一种服务而方，其VIP的工作类型；
• -n, --notify {master|backup|fault}：指定通知的类型，即vrrp角色切换的目标角色；
• -h, --help：获取脚本的使用帮助；

------------------------------------------------------------------------------------------------------------------------

#!/bin/bash?

# Author: freeloda???

# description: An example of notify script??

# Usage: notify.sh -m|--mode {mm|mb} -s|--service SERVICE1,... -a|--address VIP? -n|--notify {master|backup|falut} -h|--help

contact=‘1521076067@163.com‘ #设置管理员的邮箱

helpflag=0??

serviceflag=0??

modeflag=0??

addressflag=0??

notifyflag=0

Usage() {?

??echo "Usage: notify.sh [-m|--mode {mm|mb}] [-s|--service SERVICE1,...] <-a|--address VIP>? <-n|--notify {master|backup|falut}>"???

??echo "Usage: notify.sh -h|--help"??

}

ParseOptions() {?

??local I=1;??

??if [ $# -gt 0 ]; then??

????while [ $I -le $# ]; do??

??????case $1 in??

??????-s|--service)??

????????[ $# -lt 2 ] && return 3??

?????????serviceflag=1??

?????????services=(`echo $2|awk -F"," ‘{for(i=1;i<=NF;i++) print $i}‘`)??

????????shift 2 ;;??

??????-h|--help)??

?????????helpflag=1??

????????return 0??

????????shift??

????????;;??

??????-a|--address)??

????????[ $# -lt 2 ] && return 3??

????????addressflag=1??

????????vip=$2??

????????shift 2??

????????;;??

??????-m|--mode)??

????????[ $# -lt 2 ] && return 3??

????????mode=$2??

????????shift 2??

????????;;??

??????-n|--notify)??

????????[ $# -lt 2 ] && return 3??

????????notifyflag=1??

????????notify=$2??

????????shift 2??

????????;;??

??????*)??

????????echo "Wrong options..."??

????????Usage??

????????return 7??

????????;;??

???????esac??

????done??

????return 0??

??fi??

}

#workspace=$(dirname $0)

RestartService() {?

??if [ ${#@} -gt 0 ]; then??

????for I in $@; do??

??????if [ -x /etc/rc.d/init.d/$I ]; then??

????????/etc/rc.d/init.d/$I restart??

??????else??

????????echo "$I is not a valid service..."??

??????fi??

????done??

??fi??

}

StopService() {?

??if [ ${#@} -gt 0 ]; then??

????for I in $@; do??

??????if [ -x /etc/rc.d/init.d/$I ]; then??

????????/etc/rc.d/init.d/$I stop??

??????else??

????????echo "$I is not a valid service..."??

??????fi??

????done??

??fi??

}

Notify() {??

????mailsubject="`hostname` to be $1: $vip floating"??

????mailbody="`date ‘+%F %H:%M:%S‘`, vrrp transition, `hostname` changed to be $1."??

????echo $mailbody | mail -s "$mailsubject" $contact??

}

# Main Function??

ParseOptions $@??

[ $? -ne 0 ] && Usage && exit 5

[ $helpflag -eq 1 ] && Usage && exit 0

if [ $addressflag -ne 1 -o $notifyflag -ne 1 ]; then?

??Usage??

??exit 2??

fi

mode=${mode:-mb}

case $notify in?

‘master‘)??

??if [ $serviceflag -eq 1 ]; then??

??????RestartService ${services[*]}??

??fi??

??Notify master??

??;;??

‘backup‘)??

??if [ $serviceflag -eq 1 ]; then??

????if [ "$mode" == ‘mb‘ ]; then??

??????StopService ${services[*]}??

????else??

??????RestartService ${services[*]}??

????fi??

??fi??

??Notify backup??

??;;??

‘fault‘)??

??Notify fault??

??;;??

*)??

??Usage??

??exit 4??

??;;??

esac

?

?

(2).在keepalived.conf配置文件中，其调用方法如下所示：

• notify_master "/etc/keepalived/notify.sh -n master -a 172.16.21.100" ?
• notify_backup "/etc/keepalived/notify.sh -n backup -a 172.16.21.100" ?
• notify_fault "/etc/keepalived/notify.sh -n fault -a 172.16.21.100"

(3).修改配置文件

master(node17):只需要在原配置基础上加上绿色着色出的代码

????[root@node17 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_schedown { #定义vrrp执行脚本

script "[ -e /etc/keepalived/down ] && exit 1 || exit 0" #查看是否有down文件，有就进入维护模式

interval 1 #监控间隔时间

weight -5 #降低优先级

fall 2 #失败次数

rise 1 #成功数次

}

?

vrrp_instance VI_1 {

state MASTER #配置模式

interface eth0

virtual_router_id 51

priority 101 #配置优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

track_script { #执行脚本

chk_schedown

}

#增加以下三行

notify_master "/etc/keepalived/notify.sh -n master -a 172.16.21.100"

notify_backup "/etc/keepalived/notify.sh -n backup -a 172.16.21.100"

notify_fault "/etc/keepalived/notify.sh -n fault -a 172.16.21.100"

}

?

virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

?

real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

?

#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

?

# sorry_server 192.168.200.200 1358

?

# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

?

# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#} ?

?

slave(node18):只需要在原配置的基础上增加下面绿色着色处的代码

[root@node18 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

?

global_defs {

notification_email {

????root@node17.stu21.com

????root@node18.stu21.com #配置管理员邮箱

}

notification_email_from kaadmin@stu21.com #配置发件人

smtp_server 127.0.0.1 #配置邮件服务器

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_schedown {

script "[ -e /etc/keepalived/down ] && exit 1 || exit 0"

interval 1

weight -5

fall 2

rise 1

}

vrrp_instance VI_1 {

state BACKUP #配置模式 #修改为BACKUP

interface eth0

virtual_router_id 51

priority 100 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

track_script {

chk_schedown

}

#增加以下三行

notify_master "/etc/keepalived/notify.sh -n master -a 172.16.21.100"

notify_backup "/etc/keepalived/notify.sh -n backup -a 172.16.21.100"

notify_fault "/etc/keepalived/notify.sh -n fault -a 172.16.21.100"

}

?

virtual_server 172.16.21.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

?

real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

???? status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

?

#virtual_server#10.10.10.2 1358 {

# delay_loop 6

# lb_algo rr

# lb_kind NAT

# persistence_timeout 50

# protocol TCP

?

# sorry_server 192.168.200.200 1358

?

# real_server 192.168.200.2 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.3 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334c

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

#virtual_server#10.10.10.3 1358 {

# delay_loop 3

# lb_algo rr

# lb_kind NAT

# nat_mask 255.255.255.0

# persistence_timeout 50

# protocol TCP

?

# real_server 192.168.200.4 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

?

# real_server 192.168.200.5 1358 {

# weight 1

# HTTP_GET {

# url {

# path /testurl/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl2/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# url {

# path /testurl3/test.jsp

# digest 640205b7b0fc66c1ea91c463fac6334d

# }

# connect_timeout 3

# nb_get_retry 3

# delay_before_retry 3

# }

# }

#}

?

?

(4).增加脚本

[root@node18 keepalived]# pwd

/etc/keepalived

[root@node18 keepalived]# vim notify.sh

[root@node18 keepalived]# cat notify.sh

#!/bin/bash

# Author: freeloda

# description: An example of notify script

# Usage: notify.sh -m|--mode {mm|mb} -s|--service SERVICE1,... -a|--address VIP -n|--notify {master|backup|falut} -h|--help

contact=‘ root@node17.stu21.com‘

contact=‘ root@node18.stu21.com‘

helpflag=0

serviceflag=0

modeflag=0

addressflag=0

notifyflag=0

Usage() {

echo "Usage: notify.sh [-m|--mode {mm|mb}] [-s|--service SERVICE1,...] <-a|--address VIP> <-n|--notify {master|backup|falut}>"

echo "Usage: notify.sh -h|--help"

}

ParseOptions() {

local I=1;

if [ $# -gt 0 ]; then

while [ $I -le $# ]; do

case $1 in

-s|--service)

[ $# -lt 2 ] && return 3

serviceflag=1

services=(`echo $2|awk -F"," ‘{for(i=1;i<=NF;i++) print $i}‘`)

shift 2 ;;

-h|--help)

helpflag=1

return 0

shift

;;

-a|--address)

[ $# -lt 2 ] && return 3

addressflag=1

vip=$2

shift 2

;;

-m|--mode)

[ $# -lt 2 ] && return 3

mode=$2

shift 2

;;

-n|--notify)

[ $# -lt 2 ] && return 3

notifyflag=1

notify=$2

shift 2

;;

*)

echo "Wrong options..."

Usage

return 7

;;

esac

done

return 0

fi

}

#workspace=$(dirname $0)

RestartService() {

if [ ${#@} -gt 0 ]; then

for I in $@; do

if [ -x /etc/rc.d/init.d/$I ]; then

/etc/rc.d/init.d/$I restart

else

echo "$I is not a valid service..."

fi

done

fi

}

StopService() {

if [ ${#@} -gt 0 ]; then

for I in $@; do

if [ -x /etc/rc.d/init.d/$I ]; then

/etc/rc.d/init.d/$I stop

else

echo "$I is not a valid service..."

fi

done

fi

}

Notify() {

mailsubject="`hostname` to be $1: $vip floating"

mailbody="`date ‘+%F %H:%M:%S‘`, vrrp transition, `hostname` changed to be $1."

echo $mailbody | mail -s "$mailsubject" $contact

}

# Main Function

ParseOptions $@

[ $? -ne 0 ] && Usage && exit 5

[ $helpflag -eq 1 ] && Usage && exit 0

if [ $addressflag -ne 1 -o $notifyflag -ne 1 ]; then

Usage

exit 2

fi

mode=${mode:-mb}

case $notify in

‘master‘)

if [ $serviceflag -eq 1 ]; then

RestartService ${services[*]}

fi

Notify master

;;

‘backup‘)

if [ $serviceflag -eq 1 ]; then

if [ "$mode" == ‘mb‘ ]; then

StopService ${services[*]}

else

RestartService ${services[*]}

fi

fi

Notify backup

;;

‘fault‘)

Notify fault

;;

*)

Usage

exit 4

;;

esac

?

?

[root@node18 keepalived]# chmod +x notify.sh

?

(6).将slave(node18)上脚本复制到master(node17)上

[root@node18 keepalived]# scp -rp notify.sh node17:/etc/keepalived/

notify.sh

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?

(7).测试一下脚本

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[root@node18 keepalived]# ./notify.sh -h

Usage: notify.sh [-m|--mode {mm|mb}] [-s|--service SERVICE1,...] <-a|--address VIP> <-n|--notify {master|backup|falut}>

Usage: notify.sh -h|--help

[root@node18 keepalived]# ./notify.sh --help

Usage: notify.sh [-m|--mode {mm|mb}] [-s|--service SERVICE1,...] <-a|--address VIP> <-n|--notify {master|backup|falut}>

Usage: notify.sh -h|--help

[root@node18 keepalived]# ./notify.sh -m mb -a 1.1.1.1 -n master

?

?

(9).模拟故障,切记在模拟故障时先重启一下keepalived服务。

[root@node17 keepalived]# ip addr show #查看一下VIP?

?

[root@node17 keepalived]#touch down #进入维护模式??

?

?

?

[root@node18 keepalived]# ip addr show #大家可以看到VIP成功移动到slave上?

?

在有vip的节点上查看一下邮件:

[root@node18 keepalived]# mail

?

?

主备切换时，会发送邮件报警，好了到这里所有演示全部完成。

?

思考题一：

还有个小问题是：如果两个装有keepalived 的节点，在/etc/keepalived/keepalived.conf 中都是主模型，且优先级都是一样的，那么vip 会在哪个节点上？

答案：会根据节点ip最后一个字节大些来确定。vip会在大的字节上。

?

思考题二：

设置双主模型，即两个vip，同样只需要两台服务器(node17,node18):每个节点既是主又是从。

只需对两个配置文件各自添加 vrrp_instance VI_2 ，virtual_server 两段

node17:

---------------------------------------------------------------------------------------------------------------

????vrrp_instance VI_2 {

state BACKUP #配置模式 #修改为BACKUP

#state MASTER #测试配置模式

interface eth0

virtual_router_id 52

?

priority 99 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.101 #配置虚拟IP地址

}

track_script {

chk_schedown

}

#增加以下三行

notify_master "/etc/keepalived/notify.sh -n master -a 172.16.21.101"

notify_backup "/etc/keepalived/notify.sh -n backup -a 172.16.21.101"

notify_fault "/etc/keepalived/notify.sh -n fault -a 172.16.21.101"

}

?

----------------------------------------------------------------------------------------------------------------------

?

virtual_server 172.16.21.101 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

?

real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

?

--------------------------------------------------------------------------------------------------------------------

node18:

?

vrrp_instance VI_2 {

#state BACKUP #配置模式 #修改为BACKUP

state MASTER #测试配置模式

interface eth0

virtual_router_id 52

?

priority 101 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.101 #配置虚拟IP地址

}

track_script {

chk_schedown

}

#增加以下三行

notify_master "/etc/keepalived/notify.sh -n master -a 172.16.21.101"

#增加以下三行

notify_master "/etc/keepalived/notify.sh -n master -a 172.16.21.101"

notify_backup "/etc/keepalived/notify.sh -n backup -a 172.16.21.101"

notify_fault "/etc/keepalived/notify.sh -n fault -a 172.16.21.101"

}

?

?

?

virtual_server 172.16.21.101 80 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

#persistence_timeout 50

protocol TCP

?

real_server 172.16.21.15 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

real_server 172.16.21.16 80 { #配置realaserver

weight 1

HTTP_GET {#监控配置

url {

path /

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

?

?

#digest ff20ad2481f97b1754ef3e12ecd3a9cc

status_code 200

}

?

connect_timeout 3

nb_get_retry 3

delay_before_retry 1

}

}

sorry_server 127.0.0.1 80 #增加一行sorry_server

}

?

?

----------------------------------------------------------------------------------------------------------------------

?

到这里思考题2 还没有结束，因为我们通过前面LVS-DR在节点node15,node16上只设置了一个vip=172.16.21.100 所以keepalived的双主模型（节点node17,node18）上无法实现RS1(node15),RS2(node16)高可用。

此时我们分别设置节点node15,node16上的/root/src/ realserver.sh的脚本配置(文章前面已经创建过)

?

node15:只需要添加我着色的代码

[root@node15 src]# pwd

/root/src

[root@node15 src]# ls

realserver.sh

[root@node15 src]# vim realserver.sh

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#!/bin/bash

#

# Script to start LVS DR real server.

# description: LVS DR real server

#

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

VIP=172.16.21.100

VIP1=172.16.21.101 #添加增加的VIP，双主模型用到

host=`/bin/hostname`

case "$1" in

start)

# Start LVS-DR real server on this machine.

/sbin/ifconfig lo down

/sbin/ifconfig lo up

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

/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

/sbin/ifconfig lo:1 $VIP1 broadcast $VIP1 netmask 255.255.255.255 up

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

/sbin/route add -host $VIP1 dev lo:1

;;

stop)

# Stop LVS-DR real server loopback device(s).

/sbin/ifconfig lo:0 down

/sbin/ifconfig lo:1 down

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

;;

status)

# Status of LVS-DR real server.

islothere=`/sbin/ifconfig lo:0 | grep $VIP`

islothere=`/sbin/ifconfig lo:1 | grep $VIP1`

isrothere=`netstat -rn | grep "lo:0" | grep $VIP`

isrothere=`netstat -rn | grep "lo:1" | grep $VIP1`

if [ ! "$islothere" -o ! "isrothere" ];then

# Either the route or the lo:0 device

# not found.

echo "LVS-DR real server Stopped."

else

echo "LVS-DR real server Running."

fi

;;

*)

# Invalid entry.

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

exit 1

;;

esac

?

?

?

node16:

只需要node15上的/root/src/ realserver.sh的脚本配置复制一份给node16:

[root@node15 src]# scp realserver.sh node16:/root/src/

realserver.sh 100% 1881 1.8KB/s 00:00

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?

?

?

接下来测试一下：

VIP=172.16.21.100 实现高可用

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VIP=172.16.21.101 实现高可用

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?

?

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Apache+lvs高可用+keepalive(主从+双主模型)

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原文地址：http://www.cnblogs.com/na2po2lun/p/4270987.html