Nginx+keepalived 脚本安装主从双机热备自动切换解决方案

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Nginx+keepalived 脚本安装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

1. #!/bin/bash
   
2. # author: kuangl
   
3. # mail: kuangl@orient-media.com
   
4. # description: The installation of Nginx files.
   
5. # -------------------------------------------------------- #
   
6. ## Nginx_install
   
7. # -------------------------------------------------------- #
   
8. # Nginx installation
   
9. #CURRENT_PATH=$(pwd)
   
10. 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}')
    
11. do
    
12. yum -y install $i
    
13. done
    
14. [ -d /root/software ]
    
15. [ "$?" != 0 ] && mkdir /root/software
    
16. cd /root/software
    
17. [ !-e pcre-8.33.tar.gz ] && wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.33.tar.gz
    
18. tar -zxvf pcre-8.33.tar.gz
    
19. cd pcre-8.33
    
20. ./configure
    
21. make && make install
    
22. echo $? || [ $? != 0] || echo" installation pcrefailed" || exit 1
    
23. cd /root/software
    
24. [ ! -e nginx-1.2.9.tar.gz ] && wget http://nginx.org/download/nginx-1.2.9.tar.gz
    
25. tar -zxvf nginx-1.2.9.tar.gz
    
26. cd nginx-1.2.9
    
27. ./configure--prefix=/usr/local/nginx --with-http_ssl_module --with-http_sub_module --with-http_stub_status_module--with-http_gzip_static_module
    
28. make && make install
    
29. echo $? || [ $? != 0] || echo" installationnginxfailed" || exit 1
    
30. # -------------------------------------------------------- #
    
31. ## Keepalived_intsall
    
32. # -------------------------------------------------------- #
    
33. # Keepalived installation
    
34. cd /root/softwarae
    
35. [ ! -e keepalived-1.2.4.tar.gz ] &&wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz
    
36. tar -zxvf keepalived-1.2.4.tar.gz
    
37. cd keepalived-1.2.4
    
38. ln -s /usr/src/kernels/$(uname -r) /usr/src/kernels/linux
    
39. ./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
    
40. make && make install
    
41. echo $? || [ $? != 0] || print " installation keepalivedfailed" || exit 1
    
42. chkconfig --add keepalived
    
43. chkconfig --level 345 keepalived on

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二、主Nginx 配置

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

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1. [root@node5 conf]# ../sbin/nginx -s reload
   
2. [root@node5 conf]# curl http://192.168.122.5
   
3. 192.168.122.5

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三、主Keepalived配置

1. [root@node6 conf]# vim /etc/keepalived/keepalived.conf
   
2. ! Configuration File for keepalived
   
3. global_defs {
   
4. notification_email {
   
5. 404060@qq.com
   
6. 138162@139.com
   
7. }
   
8. notification_email_from 404060@qq.com
   
9. smtp_server 127.0.0.1
   
10. smtp_connect_timeout 30
    
11. router_id LVS_DEVEL
    
12. }
    
13. vrrp_script chk_nginx {
    
14. script "/etc/keepalived/chk_nginx.keepalived.sh"
    
15. interval 2
    
16. weight 2
    
17. }
    
18. vrrp_instance VI_1 {
    
19. state MASTER
    
20. interface eth0
    
21. virtual_router_id 51
    
22. priority 200
    
23. advert_int 1
    
24. authentication {
    
25. auth_type PASS
    
26. auth_pass kuangling
    
27. }
    
28. track_script {
    
29. chk_nginx.keepalived
    
30. }
    
31. virtual_ipaddress {
    
32. 192.168.122.15
    
33. }
    
34. }

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四、备nginx配置

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

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1. [root@node6 conf]# ../sbin/nginx -s reload
   
2. [root@node6 conf]# curl http://192.168.122.6
   
3. 192.168.122.6
   

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五、备keepalived配置

1. [root@node6 conf]# vim /etc/keepalived/keepalived.conf
   
2. ! Configuration File for keepalived
   
3. global_defs {
   
4. notification_email {
   
5. 404060@qq.com
   
6. 138162@139.com
   
7. }
   
8. notification_email_from 404060@qq.com
   
9. smtp_server 127.0.0.1
   
10. smtp_connect_timeout 30
    
11. router_id LVS_DEVEL
    
12. }
    
13. vrrp_script chk_nginx {
    
14. script "/etc/keepalived/chk_nginx.keepalived.sh"
    
15. interval 2
    
16. weight 2
    
17. }
    
18. vrrp_instance VI_1 {
    
19. state BACKUP
    
20. interface eth0
    
21. virtual_router_id 51
    
22. priority 150
    
23. advert_int 1
    
24. authentication {
    
25. auth_type PASS
    
26. auth_pass kuangling
    
27. }
    
28. track_script {
    
29. chk_nginx.keepalived
    
30. }
    
31. virtual_ipaddress {
    
32. 192.168.122.15
    
33. }
    
34. }

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六、分别在2台nginx服务器上添加检测脚本：

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

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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 脚本安装主从双机热备自动切换解决方案