Nginx+keepalived主从双机热备自动切换解决方案

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

#!/bin/bash # author: kuangl # mail: [email protected] # 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

[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 [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

[root@node6 conf] # vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { [email protected] [email protected] } notification_email_from [email protected] 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

[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 [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

[root@node6 conf] # vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { [email protected] [email protected] } notification_email_from [email protected] 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：

[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：[ - ]

• keepalived安装
• keepalived的配置
• keepalived的测试

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.      [email protected]
4.    }
5.    notification_email_from [email protected]
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.      [email protected]
4.    }
5.    notification_email_from [email protected]
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。