Nginx+keepalived主從雙機熱備自動切換解決方案
測試環境如下：
系統：Ceentos 6.4 64位
主nginx服務器：192.168.122.5
備nginx服務器：192.168.122.6
VIP：192.168.122.15
一、Nginx+keepalived 安裝—腳本安裝
#!/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、備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、備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、分別在2臺nginx服務器上添加檢測腳本：
[root@node6 conf]# vim /etc/keepalived/chk_nginx.keepalived.sh #!/bin/bash # description: # 定時查看Nginx是否存在，如果不存在則啓動Nginx # 如果啓動失敗，則停止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 |