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

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