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

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1--------------------- #

2## Nginx_install

3# -------------------------------------------------------- #

4# Nginx installation

5#CURRENT_PATH=$(pwd)

6for 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}')

7do

8yum -y install $i

9done

10[ -d /root/software ]

11[ "$?" != 0 ] && mkdir /root/software

12cd /root/software

13[ !-e pcre-8.33.tar.gz ] && wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.33.tar.gz

14tar -zxvf pcre-8.33.tar.gz

15cd pcre-8.33

16./configure

17make && make install

18echo $? || [ $? != 0] || echo" installation pcrefailed" || exit 1

19cd /root/software

20[ ! -e nginx-1.2.9.tar.gz ] && wget http://nginx.org/download/nginx-1.2.9.tar.gz

21tar -zxvf nginx-1.2.9.tar.gz

22cd nginx-1.2.9

23./configure--prefix=/usr/local/nginx --with-http_ssl_module --with-http_sub_module --with-http_stub_status_module--with-http_gzip_static_module

24make && make install

25echo $? || [ $? != 0] || echo" installationnginxfailed" || exit 1

26# -------------------------------------------------------- #

27## Keepalived_intsall

28# -------------------------------------------------------- #

29# Keepalived installation

30cd /root/softwarae

31[ ! -e keepalived-1.2.4.tar.gz ] &&wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz

32tar -zxvf keepalived-1.2.4.tar.gz

33cd keepalived-1.2.4

34ln -s /usr/src/kernels/$(uname -r) /usr/src/kernels/linux

35./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

36make && make install

37echo $? || [ $? != 0] || print " installation keepalivedfailed" || exit 1

38chkconfig --add keepalived

39chkconfig --level 345 keepalived on

40

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二、主Nginx 配置

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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

4

5

6

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1[root@node5 conf]# ../sbin/nginx -s reload

2[root@node5 conf]# curl http://192.168.122.5

3192.168.122.5

4

5

6

三、主Keepalived配置

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1[root@node6 conf]# vim /etc/keepalived/keepalived.conf

2! Configuration File for keepalived

3global_defs {

4notification_email {

5404060@qq.com

6138162@139.com

7}

8notification_email_from 404060@qq.com

9smtp_server 127.0.0.1

10smtp_connect_timeout 30

11router_id LVS_DEVEL

12}

13vrrp_script chk_nginx {

14script "/etc/keepalived/chk_nginx.keepalived.sh"

15interval 2

16weight 2

17}

18vrrp_instance VI_1 {

19state MASTER

20interface eth0

21virtual_router_id 51

22priority 200

23advert_int 1

24authentication {

25auth_type PASS

26auth_pass kuangling

27}

28track_script {

29chk_nginx.keepalived

30}

31virtual_ipaddress {

32192.168.122.15

33}

34}

35

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四、备nginx配置

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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

4

5

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1[root@node6 conf]# ../sbin/nginx -s reload

2[root@node6 conf]# curl http://192.168.122.6

3192.168.122.6

4

5

五、备keepalived配置

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1[root@node6 conf]# vim /etc/keepalived/keepalived.conf

2! Configuration File for keepalived

3global_defs {

4notification_email {

5404060@qq.com

6138162@139.com

7}

8notification_email_from 404060@qq.com

9smtp_server 127.0.0.1

10smtp_connect_timeout 30

11router_id LVS_DEVEL

12}

13vrrp_script chk_nginx {

14script "/etc/keepalived/chk_nginx.keepalived.sh"

15interval 2

16weight 2

17}

18vrrp_instance VI_1 {

19state BACKUP

20interface eth0

21virtual_router_id 51

22priority 150

23advert_int 1

24authentication {

25auth_type PASS

26auth_pass kuangling

27}

28track_script {

29chk_nginx.keepalived

30}

31virtual_ipaddress {

32192.168.122.15

33}

34}

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六、分别在2台nginx服务器上添加检测脚本：

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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

6status=`ps -C nginx --no-header |wc -l`

7if [ $status -eq 0 ];then

8/usr/local/nginx/sbin/nginx

9sleep 3

10if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then

11killall keepalived

12fi

13fi

14[root@node6 conf]#chmod +x /etc/keepalived/chk_nginx.keepalived.sh

15

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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