集群配置流程： 一、克隆2台CentOS虚拟机，并安装jdk+tomcat二、安装1台CentOS虚拟机，并安装nginx（过程参见nginx安装流程.png）nginx的默认安装位置：/usr/local/nginx0 cd /usr/local/nginx/sbin1 启动nginx：./nginx 使用默认配置文件(/usr/local/nginx/conf/nginx.conf)或./nginx -c /x/xx/xxx/nginx.conf 2 测试http://ip:80 或 http://ip （nginx的默认端口80）3 关闭./nginx -s stop4 重启./nginx -s reload5 查看线程ps -ef | grep nginx (查询主进程号)kill -9 主进程号 (强制关闭)三、配置集群环境1 修改nginx的配置文件（默认位置：/usr/local/nginx/conf/nginx.conf）1> 配置tomcat集群节点在http节点内部，server节点外部upstream tomcat-servers {server 192.168.1.103:8080;server 192.168.1.104:8080;}2> 配置反向代理在server节点内部：location / {proxy_pass http://tomcat-servers;proxy_redirect off;proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_set_header X-Real-IP $remote_addr;proxy_set_header Host $http_host;proxy_next_upstream http_502 http_504 error timeout invalid_header;}2 启动所有tomcat节点，启动nginx，测试四、负载均衡的解决方案:1 默认：轮循upstream tomcat-servers {server 192.168.1.103:8080;server 192.168.1.104:8080;}2 iphash：基于ipupstream tomcat-servers {ip_hash;server 192.168.1.103:8080;server 192.168.1.104:8080;}3 weight：权重轮询 upstream tomcat-servers {server 192.168.1.103:8080 weight=1;server 192.168.1.104:8080 weight=2;} 4 最小连接数upstream tomcat-servers {least_conn;server 192.168.1.103:8080;server 192.168.1.104:8080;}