摘要：
准备四台服务器，两台用于活动和备用，另外两台用于访问192.168.1.120master192.1.121backup192.168.1.122nginx192.168.1.123nginx，以安装keepalivedbyum-yinstallgccpcre-develzlib-develysl-develyum-yininstallpot-devellwgethttp://www.keepalive
准备四台服务器
两台做主备,另外两台做访问
192.168.1.120 master
192.168.1.121 backup
192.168.1.122 nginx
192.168.1.123 nginx
安装keepalived
yum -y install gcc pcre-devel zlib-devel openssl-devel yum -y install popt-devel wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz tar zxvf keepalived-1.2.7.tar.gz cd keepalived-1.2.7 ./configure make&&make install
漫长的等待后.....
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
加入启动服务 注册成服务
echo "/etc/init.d/keepalived start" >> /etc/rc.local
chkconfig --add keepalived
配置master nginx 192.168.1.110 和 192.168.1.121
#user nobody; worker_processes 1; error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; #pid logs/nginx.pid; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; access_log logs/access.log; sendfile on; upstream 120.com { #ip_hash; server 192.168.1.122:80; server 192.168.1.123:80; } #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; #gzip on; server { listen 80; server_name localhost; error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } location ~ .php$ { root html; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; proxy_pass http://120.com; include fastcgi_params; } } include vhost/*.conf; }
然后访问试试
实现了负载均衡调用另外两台服务器
配置master keepalived
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived global_defs { notification_email { 25427801@qq.com } notification_email_from 25427801@qq.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id nginx_master } vrrp_script check_nginx_is_run { script "/etc/keepalived/check_nginx_is_run.sh" interval 2 weight 2 } # 虚拟IP1, 本机作为Master vrrp_instance VI_1 { state MASTER interface ens33 #你的网卡 virtual_router_id 51 priority 100 advert_int 1 track_interface { ens33 } authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.51 } track_script { check_nginx_is_run } }
配置backup keepalived
! Configuration File for keepalived global_defs { notification_email { 25427801@qq.com } notification_email_from 25427801@qq.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id nginx_backup } vrrp_script check_nginx_is_run { script "/etc/keepalived/check_nginx_is_run.sh" interval 2 weight 2 } # 虚拟IP1, 本机作为Master vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 100 advert_int 1 track_interface { ens33 } authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.51 } track_script { check_nginx_is_run } }
安装 killall 命令
yum install psmisc
编写 shell 脚本
#!/bin/bash A=`ps -C nginx --no-header |wc -l` if [ $A -eq 0 ];then /usr/local/nginx/sbin/nginx #重启nginx sleep 3 if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then #nginx重启失败，则停掉keepalived服务，进行VIP转移 killall keepalived fi fi
设置可执行命令
chmod a+x check_nginx_is_run.sh
如果你是window下放进去的,会有
-bash: ./check_nginx_is_run.sh: /bin/bash^M: 坏的解释器: 没有那个文件或目录
解决办法
sed -i 's/ $//' check_nginx_is_run.sh
查看master keepalived 日记 vim /var/log/messages
查看 backup
好了不说了 停止nginx ,再不行就关机 192.168.1.120 or 121
如果你service nginx stop 来测试,你会发现关不掉,因为脚本重启了
你会发现OK了~
