nginx+keepalive 实现高可用负载均衡方案
主nginx负载均衡器:172.26.11.99? ( 通过keepalived 配置了VIP:172.26.11.101供外使用) 副nginx负载均衡器:172.26.11.100 ( 通过keepalived 配置了VIP:172.26.11.101供外使用) 后端web服务器: 172.26.11.73 172.26.11.74 一、172.26.11.99 以及 172
主nginx负载均衡器:172.26.11.99? (通过keepalived配置了VIP:172.26.11.101供外使用)
副nginx负载均衡器:172.26.11.100 (通过keepalived配置了VIP:172.26.11.101供外使用)
后端web服务器:
172.26.11.73
172.26.11.74
一、172.26.11.99 以及 172.26.11.100的关键nginx配置如下:
vim /etc/nginx/nginx.conf
################# .... upstream? www.xxx.com? { server?? 172.26.11.73:8080 max_fails=1;#max_fails 表示健康检查失败的次数,这里表示次数为一次,即标记该服务器down了 server?? 172.26.11.74:8080 max_fails=1; } server { listen? 80; server_name? www.xxx.com; location / { proxy_next_upstream error timeout http_500 http_502 http_504;? #这里表示健康检查涉及到的情形,有这些情形的,都切换到另外的web服务器访问 proxy_read_timeout 10s;?? #这里表示程序返回的时间,请参考php.ini的max_exe_time来设置。 proxy_pass??????? http://www.xxx.com; proxy_set_header?? Host???????????? $host; proxy_set_header?? X-Real-IP??????? $remote_addr; proxy_set_header?? X-Forwarded-For? $proxy_add_x_forwarded_for; } #access_log? /var/log/nginx/xxx.log; } ##########################
二、安装keepalive (centos)
#安装 popt yum -y install popt popt-devel cd /data/software wget http://www.keepalived.org/software/keepalived-1.2.8.tar.gz cd /data/src tar zxf ../software/keepalived-1.2.8.tar.gz cd keepalived-1.2.8 ./configure --prefix=/usr/local/keepalived --sysconf=/etc make && make install cp /usr/local/keepalived/sbin/keepalived /bin/ chkconfig --add keepalived #设置开机启动 chkconfig keepalived on #启动keepalive服务 /etc/init.d/keepalived start
如果是ubuntu 直接 apt-get install keepalived 吧….
三、keepalive设置
cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_bak
MASTER
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived global_defs { notification_email { admin@test.com } notification_email_from admin@test.com smtp_server xxx.smtp.com smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script Monitor_Nginx { script "/root/monitor_nginx.sh" interval 2 weight 2 } vrrp_instance VI_1 { state MASTER #(主机为MASTER,备用机为BACKUP) interface eth0 #(HA监测网络接口) virtual_router_id 61 #(主、备机的virtual_router_id必须相同) #mcast_src_ip 172.26.11.99 #(多播的源IP,设置为本机外网IP,与VIP同一网卡)此项可不设置 priority 90 #(主、备机取不同的优先级,主机值较大,备份机值较小,值越大优先级越高) advert_int 1 #(VRRP Multicast广播周期秒数) authentication { auth_type PASS #(VRRP认证方式) auth_pass 1234 #(密码) } track_script { Monitor_Nginx #(调用nginx进程检测脚本) } virtual_ipaddress { 172.26.11.101 #(VRRP HA虚拟地址) } }
BACKUP方面只需要修改state为BACKUP , priority比MASTER稍低即可
四、监控nginx进程的脚本:monitor_nginx.sh 内容如下:
vim /root/monitor_nginx.sh
当检测到nginx进程不存在的时候,就干掉所有的keepalived,这时候,请求将会由keepalived的backup接管!!
#!/bin/bash if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ] then killall keepalived fi
chmod +x /root/monitor_nginx.sh
172.26.11.99 172.26.11.100都重新启动keepalived:
service keepalived restart
这里请注意,当keepalived启动后,我们可以用命令:
ip add show eth0 来看我们的eth0网卡确实被添加了虚拟IP,如下图:
完毕,可以测试了!
原文地址:nginx+keepalive 实现高可用负载均衡方案, 感谢原作者分享。
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