nginx实现tomcat的负载均衡

安装nginx

• 下载nginx最新版本：http://nginx.org/en/download.html
• 复制到/usr/local下
• 解压安装包 ：tar -zxvf nginx-1.11.13.tar.gz
• 可以通过./configure –prefix=/usr/local/nginx-1.11.13指定安装目录
• make & make install

启动nginx

/usr/local/nginx/sbin/nginx

安装tomcat

• 解压安装包：tar -zxvf apache-tomcat-7.0.77.tar.gz
• 修改端口
  vim /usr/local/tomcat2/conf/server.xml
  只修改一个tomcat即可，修改完成之后tomcat1：8080，tomcat2：8090

<server port="8006" shutdown="SHUTDOWN"><Connector port="8090" protocol="HTTP/1.1"               connectionTimeout="20000"               redirectPort="8443" />

• 分别启动tomcat
  /usr/local/tomcat1/bin/startup.sh
  /usr/local/tomcat2/bin/startup.sh
  

  配置nginx负载均衡

  vim /usr/local/nginx/conf/nginx.conf

worker_processes  1;    events {        worker_connections  1024;    }    http {    include       mime.types;    default_type  application/octet-stream;    sendfile        on;    keepalive_timeout  65;    upstream sunld{        server 127.0.0.1:8080 weight=1;        server 127.0.0.1:8090 weight=1;    }    server {        listen       80;        server_name  127.0.0.1;        location / {           proxy_pass http://sunld;         }        error_page   500 502 503 504  /50x.html;        location = /50x.html {            root   html;        }    }    }

重启/usr/local/nginx/sbin/nginx -s reload

使用redis处理session共享

修改tomcat中的context.xml文件

<?xml version='1.0' encoding='utf-8'?>  <Context>      <WatchedResource>WEB-INF/web.xml</WatchedResource>      <!-- tomcat-redis-session共享配置 -->      <Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />          <Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"           host="127.0.0.1"            port="6379"            database="0"            maxInactiveInterval="60" />  </Context>