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Nginx+keepalived主从双机热备自动切换解决方案

 
阅读更多

Nginx+keepalived主从双机热备自动切换解决方案


测试环境如下：

系统：Ceentos 6.4 64位

主nginx服务器：192.168.122.5

备nginx服务器：192.168.122.6

VIP：192.168.122.15

一、Nginx+keepalived 安装—脚本安装

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#!/bin/bash
# author: kuangl
# mail: kuangl@orient-media.com
# description: The installation of Nginx files.
# -------------------------------------------------------- #
## Nginx_install
# -------------------------------------------------------- #
# Nginx installation
#CURRENT_PATH=$(pwd)
for i in $(rpm -q gcc gcc-c++ kernel-devel openssl-devel zlib-devel popt-devel popt-static libnl-devel wget make |grep 'not installed' | awk '{print $2}')
do
yum -y install $i
done
[ -d /root/software ]
[ "$?" != 0 ] && mkdir /root/software
cd /root/software
[ !-e pcre-8.33.tar.gz ] && wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.33.tar.gz
tar -zxvf pcre-8.33.tar.gz
cd pcre-8.33
./configure
make && make install
echo $? || [ $? != 0] || echo" installation pcrefailed" || exit 1
cd /root/software
[ ! -e nginx-1.2.9.tar.gz ] && wget http://nginx.org/download/nginx-1.2.9.tar.gz
tar -zxvf nginx-1.2.9.tar.gz
cd nginx-1.2.9
./configure--prefix=/usr/local/nginx --with-http_ssl_module --with-http_sub_module --with-http_stub_status_module--with-http_gzip_static_module
make && make install
echo $? || [ $? != 0] || echo" installationnginxfailed" || exit 1
# -------------------------------------------------------- #
## Keepalived_intsall
# -------------------------------------------------------- #
# Keepalived installation
cd /root/softwarae
[ ! -e keepalived-1.2.4.tar.gz ] &&wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz
tar -zxvf keepalived-1.2.4.tar.gz
cd keepalived-1.2.4
ln -s /usr/src/kernels/$(uname -r) /usr/src/kernels/linux
./configure --prefix=/usr--bindir=/usr/bin--sbindir=/usr/bin--libexecdir=/usr/libexec --localstatedir=/var --libdir=/lib64--infodir=/usr/share/info--sysconfdir=/etc --mandir=/usr/local/share/man--with-kernel-dir=/usr/src/kernels/linux
make && make install
echo $? || [ $? != 0] || print " installation keepalivedfailed" || exit 1
chkconfig --add keepalived
chkconfig --level 345 keepalived on

 

二、主Nginx 配置

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[root@node5 conf]# mkdir -p /var/www/html
[root@node5 conf]# cat "192.168.122.5" > /var/www/html/index.html
[root@node5 conf]# vim nginx.conf

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[root@node5 conf]# ../sbin/nginx -s reload
[root@node5 conf]# curl http://192.168.122.5
192.168.122.5

 

 

三、主Keepalived配置

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[root@node6 conf]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
404060@qq.com
138162@139.com
}
notification_email_from 404060@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/etc/keepalived/chk_nginx.keepalived.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 200
advert_int 1
authentication {
auth_type PASS
auth_pass kuangling
}
track_script {
chk_nginx.keepalived
}
virtual_ipaddress {
192.168.122.15
}
}

 

 

四、备nginx配置

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[root@node6 conf]# mkdir -p /var/www/html
[root@node6 conf]# cat "192.168.122.6" > /var/www/html/index.html
[root@node6 conf]# vim nginx.conf

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[root@node6 conf]# ../sbin/nginx -s reload
[root@node6 conf]# curl http://192.168.122.6
192.168.122.6

 

五、备keepalived配置

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[root@node6 conf]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
404060@qq.com
138162@139.com
}
notification_email_from 404060@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/etc/keepalived/chk_nginx.keepalived.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass kuangling
}
track_script {
chk_nginx.keepalived
}
virtual_ipaddress {
192.168.122.15
}
}

 

六、分别在2台nginx服务器上添加检测脚本：

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[root@node6 conf]# vim /etc/keepalived/chk_nginx.keepalived.sh
#!/bin/bash
# description:
# 定时查看Nginx是否存在，如果不存在则启动Nginx
# 如果启动失败，则停止keepalived
status=`ps -C nginx --no-header |wc -l`
if [ $status -eq 0 ];then
/usr/local/nginx/sbin/nginx
sleep 3
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
killall keepalived
fi
fi
[root@node6 conf]#chmod +x /etc/keepalived/chk_nginx.keepalived.sh

 

七、测试

分别在2台nginx上启动nginx和keepalived服务，然后分别用ip a 查看ip

 

 

 

本文出自 “&思远晨曦” 博客，请务必保留此出处http://kling.blog.51cto.com/3320545/1240359

 

 

nginx+keepalived实现双机热备的高可用

64人收藏此文章, 我要收藏发表于15天前(2013-09-12 23:11) , 已有664次阅读 ，共1个评论

目录：[ - ]

这篇文章简单介绍利用keepalived软件，实现对nginx服务器的高可用，即实现故障自动切换。假设你已经安装好nginx，下面介绍keepalived的安装和使用。

keepalived安装

  1. yum install openssl-devel
  2. cd /tmp
  3. wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
  4. tar xzf keepalived-1.2.2.tar.gz
  5. cd keepalived-1.2.2
  6. ./configure
  7. make && make install
  8. cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
  9. cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
  10. chmod +x /etc/init.d/keepalived
  11. chkconfig --add keepalived
  12. chkconfig keepalived on
  13. mkdir /etc/keepalived
  14. ln -s /usr/local/sbin/keepalived /usr/sbin/

keepalived的配置

更详细的keepalived配置文件说明可以执行man keepalived.conf查看。
我们假设主服务器IP:192.168.1.103,从服务器ip:192.168.1.101 虚拟ip:192.168.1.110
下面对主服务器的keepalived进行配置：

  1. vi /etc/keepalived/keepalived.conf
  1. global_defs {
  2.    notification_email {
  3.      admin@centos.bz
  4.    }
  5.    notification_email_from keepalived@domain.com
  6.    smtp_server 127.0.0.1
  7.    smtp_connect_timeout 30
  8.    router_id LVS_DEVEL
  9. }
  10. vrrp_script chk_http_port {
  11.                 script "/opt/nginx_pid.sh"
  12.                 interval 2
  13.                 weight 2
  14. }
  15. vrrp_instance VI_1 {
  16.     state MASTER        ############ 辅机为 BACKUP
  17.     interface eth0
  18.     virtual_router_id 51
  19.     mcast_src_ip 192.168.1.103
  20.     priority 102                  ########### 权值要比 back 高
  21.     advert_int 1
  22.     authentication {
  23.         auth_type PASS
  24.         auth_pass 1111
  25.     }
  26. track_script { 
  27.         chk_http_port ### 执行监控的服务 
  28.         }
  29.     virtual_ipaddress {
  30.        192.168.1.110
  31.     }
  32. }

从服务器：

  1. global_defs {
  2.    notification_email {
  3.      admin@centos.bz
  4.    }
  5.    notification_email_from keepalived@domain.com
  6.    smtp_server 127.0.0.1
  7.    smtp_connect_timeout 30
  8.    router_id LVS_DEVEL
  9. }
  10. vrrp_script chk_http_port {
  11.                 script "/opt/nginx_pid.sh"
  12.                 interval 2
  13.                 weight 2
  14. }
  15. vrrp_instance VI_1 {
  16.     state BACKUP
  17.     interface eth0
  18.     virtual_router_id 51
  19.     mcast_src_ip 192.168.1.101
  20.     priority 101              ##########权值 要比 master 低。。
  21.     advert_int 1
  22.     authentication {
  23.         auth_type PASS
  24.         auth_pass 1111
  25.     }
  26. track_script { 
  27.         chk_http_port ### 执行监控的服务 
  28.         }
  29.     virtual_ipaddress {
  30.        192.168.1.110
  31.     }
  32. }

之后分别在主从服务器建立nginx的监控脚本：

  1. vi /opt/nginx_pid.sh
  1. #!/bin/bash
  2. A=`ps -C nginx --no-header |wc -l`               
  3. if [ $A -eq 0 ];then                                       
  4.                 /usr/local/nginx/sbin/nginx
  5.                 sleep 3
  6.                 if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
  7.                        killall keepalived
  8.                 fi
  9. fi

然后分别启动主从服务器的keepalived:

  1. service keepalived start

keepalived的测试

我们在主服务器上执行命令ip a，显示如下：

  1. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
  2.     link/ether 00:0c:29:aa:a1:e4 brd ff:ff:ff:ff:ff:ff
  3.     inet 192.168.1.103/24 brd 255.255.255.255 scope global eth0
  4.     inet 192.168.1.110/32 scope global eth0

证明主服务器已经绑定了虚拟ip 192.168.1.110
在从服务器上执行命令ip a,显示如下：

  1. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
  2.     link/ether 00:0c:29:2b:94:3b brd ff:ff:ff:ff:ff:ff
  3.     inet 192.168.1.101/24 brd 255.255.255.255 scope global eth0

显示表明从服务器上没有绑定vip 192.168.1.110,只有本机真实ip192.168.1.101
下面我们停止主服务器的nginx进程，再看看ip绑定情况:
主服务器的情况：

  1. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
  2.     link/ether 00:0c:29:aa:a1:e4 brd ff:ff:ff:ff:ff:ff
  3.     inet 192.168.1.103/24 brd 255.255.255.255 scope global eth0

从服务器的情况：

  1. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
  2.     link/ether 00:0c:29:2b:94:3b brd ff:ff:ff:ff:ff:ff
  3.     inet 192.168.1.101/24 brd 255.255.255.255 scope global eth0
  4.     inet 192.168.1.110/32 scope global eth0

由此可见vip已经指向了从服务器。

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