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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 #!/bin/bash # author: kuangl # mail: [e-mail] # description: The installation of Nginx files. # -------------------------------------------------------- # ## Nginx_install # -------------------------------------------------------- # # Nginx installation #CURRENT_PATH=$(pwd) fori in$(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] [ "$?"!= 0 ] && mkdir/root/software cd/root/software [ !-e pcre-8.33.tar.gz ] && wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.33.tar.gz tar-zxvf pcre-8.33.tar.gz cdpcre-8.33 ./configure make&& makeinstall echo$? || [ $? != 0] || echo" installation pcrefailed"|| exit1 cd/root/software [ ! -e nginx-1.2.9.tar.gz ] && wget http://nginx.org/download/nginx-1.2.9.tar.gz tar-zxvf nginx-1.2.9.tar.gz cdnginx-1.2.9 ./configure--prefix=/usr/local/nginx--with-http_ssl_module --with-http_sub_module --with-http_stub_status_module--with-http_gzip_static_module make&& makeinstall echo$? || [ $? != 0] || echo" installationnginxfailed"|| exit1 # -------------------------------------------------------- # ## Keepalived_intsall # -------------------------------------------------------- # # Keepalived installation cd/root/softwarae [ ! -e keepalived-1.2.4.tar.gz ] &&wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz tar-zxvf keepalived-1.2.4.tar.gz cdkeepalived-1.2.4 ln-s /usr/src/kernels/$(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&& makeinstall echo$? || [ $? != 0] || print " installation keepalivedfailed"|| exit1 chkconfig --add keepalived chkconfig --level 345 keepalived on

二、主Nginx 配置

1 2 3 [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 1 2 3 [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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 [root@node6 conf]# vim /etc/keepalived/keepalived.conf ! Configuration File forkeepalived global_defs { notification_email { [e-mail] [e-mail] } notification_email_from [e-mail] 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

1 2 3 [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 1 2 3 [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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 [root@node6 conf]# vim /etc/keepalived/keepalived.conf ! Configuration File forkeepalived global_defs { notification_email { [e-mail] [e-mail] } notification_email_from [e-mail] 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：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 [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 -eq0 ];then /usr/local/nginx/sbin/nginx sleep3 if[ `ps-C nginx --no-header |wc-l` -eq0 ];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

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