Nginx +keepalived

配置高可用的Nginx

准备环境：

节点node17,node18

lftp 172.16.0.1:/pub/Sources/6.x86_64/nginx

[root@node17 ~]# rpm -ivh nginx-1.6.2-1.el6.ngx.x86_64.rpm

[root@node17 ~]# scp -rp nginx-1.6.2-1.el6.ngx.x86_64.rpm node18:/root

[root@node18 ~]# rpm -ivh nginx-1.6.2-1.el6.ngx.x86_64.rpm

为两个节点上都配置默认的网页，来以示区别

[root@node17 html]# vim index.html

[root@node18 html]# vim index.html

接下来启动两个节点上的nginx 服务：

[root@node17 html]# service nginx start;ssh node18 'service nginx start';

测试：

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？以及监测nginx的状态？？
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。

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

}

vrrp_script chk_nginx {

script "killall -0 nginx"

interval 1

weight -5

fall 2

rise 1

}

(2).执行脚本

track_script {

chk_schedown #执行chk_schedown脚本

chk_nginx #执行chk_nginx脚本

}

node17:我就继续沿用apache+lvs+keepalived的节点node17上keepalived相关配置，稍作修改

[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_script chk_nginx {

script "killall -0 nginx"

interval 1

weight -5

fall 2

rise 1

}

vrrp_instance VI_1 {

state MASTER #配置模式

#state BACKUP #测试配置模式

interface eth0

virtual_router_id 51

priority 100 #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

chk_nginx #执行chk_nginx脚本

}

#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"

}

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

chk_nginx #执行chk_nginx脚本

}

#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 172.16.21.100 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 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

#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

# }

node18:同样也是沿用apache+lvs+keepalived的节点node17上keepalived相关配置，稍作修改，着色说明需要加上

[root@node18 keepalived]# cat 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_script chk_nginx {

script "killall -0 nginx"

interval 1

weight -5

fall 2

rise 1

}

vrrp_instance VI_1 {

state BACKUP #配置模式 #修改为BACKUP

# state MASTER #测试配置模式

interface eth0

virtual_router_id 51

priority 99 #配置优先级 #修改优先级

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.21.100 #配置虚拟IP地址

}

track_script {

chk_schedown

chk_nginx #执行chk_nginx脚本

}

#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"

}

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

chk_nginx #执行chk_nginx脚本

}

#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 172.16.21.100 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 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

#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

# }

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