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
<h1>node15.stu21.com</h1>
[root@node18 html]# vim index.html
<h1>node2.stu21.com </h1>
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
# }
# }
#}