nginx+tomcat实现负载均衡

本文的主要 内容来自：http://blog.csdn.net/zhaohaifan/article/details/8004026

感谢原来的作者：zhaohaifan

1、安装nginx

     所需的prce库

     wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.10.tar.gz

     

    tar zxvf pcre-8.10.tar.gz

    cd pcre-8.10/
    ./configure
    make && make install
    cd ../

   安装nginx

    wget http://nginx.org/download/nginx-0.8.54.tar.gz  

    wget http://nginx.org/download/nginx-1.0.2.tar.gz

   tar zxvf nginx-1.0.2.tar.gz
   cd nginx-1.0.2/
   ./configure --user=root --group=root --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module   如果出错，先看看 4、安装zlib
   make && make install
   cd ../ 

创建Nginx日志目录 

mkdir -p /home/nginx/logs
chmod +w /home/nginx/logs
chown -R root:root /home/nginx/logs 

创建Nginx配置文件 

①、在/usr/local/nginx/conf/目录中创建nginx.conf文件：
       rm -f /usr/local/nginx/conf/nginx.conf
       vi /usr/local/nginx/conf/nginx.conf 

输入以下内容： 

user www www;

worker_processes 8;

error_log /home/nginx/logs/nginx_error.log  crit;

pid /usr/local/nginx/nginx.pid;

worker_rlimit_nofile 65535;

events

{

    use epoll;

    worker_connections 65535;

}

http

{

    include mime.types;

    default_type application/octet-stream;

    #charset gb2312;

    server_names_hash_bucket_size 128;

    client_header_buffer_size 32k;

    large_client_header_buffers 4 32k;

    client_max_body_size 8m;

    sendfile on;

    tcp_nopush on;

    keepalive_timeout 60;

    tcp_nodelay on;

    fastcgi_connect_timeout 300;

    fastcgi_send_timeout 300;

    fastcgi_read_timeout 300;

    fastcgi_buffer_size 64k;

    fastcgi_buffers 4 64k;

    fastcgi_busy_buffers_size 128k;

    fastcgi_temp_file_write_size 128k;

    gzip on;

    gzip_min_length 1k;

    gzip_buffers 4 16k;

    gzip_http_version 1.0;

    gzip_comp_level 2;

    gzip_types text/plain application/x-javascript text/css application/xml;

    gzip_vary on;

    #limit_zone crawler$binary_remote_addr10m;

  #测试

 server

  {

   listen      80;

    server_name www.test.com;

    index index.htm index.html index.jsp;

   root  /home/htdocs/web/ROOT/;

    location ~ .*$

    {

      index index.jsp;

      proxy_pass http://www.test.com:8080;

    }

    access_log logs/sp.imichat.com.log combined;

    error_page  404 = /404.html;

  }

}

　②、在/usr/local/nginx/conf/目录中创建fcgi.conf文件：
            vi /usr/local/nginx/conf/fcgi.conf 

    输入以下内容： 

    fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;

fastcgi_param  SERVER_SOFTWARE    nginx;


fastcgi_param  QUERY_STRING       $query_string;
fastcgi_param  REQUEST_METHOD     $request_method;
fastcgi_param  CONTENT_TYPE       $content_type;
fastcgi_param  CONTENT_LENGTH     $content_length;


fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
fastcgi_param  REQUEST_URI        $request_uri;
fastcgi_param  DOCUMENT_URI       $document_uri;
fastcgi_param  DOCUMENT_ROOT      $document_root;
fastcgi_param  SERVER_PROTOCOL    $server_protocol;


fastcgi_param  REMOTE_ADDR        $remote_addr;
fastcgi_param  REMOTE_PORT        $remote_port;
fastcgi_param  SERVER_ADDR        $server_addr;
fastcgi_param  SERVER_PORT        $server_port;
fastcgi_param  SERVER_NAME        $server_name;


# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param  REDIRECT_STATUS    200;

启动Nginx 

ulimit -SHn 65535
/usr/local/nginx/sbin/nginx 

配置开机自动启动Nginx 

    vi /etc/rc.local 

在末尾增加以下内容： 

ulimit -SHn 65535 

/usr/local/nginx/sbin/nginx 

优化Linux内核参数 

vi /etc/sysctl.conf 

在末尾增加以下内容： 

    # Add

net.ipv4.tcp_max_syn_backlog = 65536
net.core.netdev_max_backlog =  32768
net.core.somaxconn = 32768


net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216


net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2


net.ipv4.tcp_tw_recycle = 1
#net.ipv4.tcp_tw_len = 1
net.ipv4.tcp_tw_reuse = 1


net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800


#net.ipv4.tcp_fin_timeout = 30
#net.ipv4.tcp_keepalive_time = 120
net.ipv4.ip_local_port_range = 1024  65535

使配置立即生效： 

   /sbin/sysctl -p 

在不停止Nginx服务的情况下变更Nginx配置 

修改/usr/local/nginx/conf/nginx.conf配置文件后，请执行以下命令检查配置文件是否正确：
/usr/local/nginx/sbin/nginx -t 

如果屏幕显示以下两行信息，说明配置文件正确：
　　the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
　　the configuration file /usr/local/nginx/conf/nginx.conf was tested successfully 

重启nginx： 

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

编写每天定时切割Nginx日志的脚本 

       创建脚本/usr/local/nginx/sbin/cut_nginx_log.sh

            vi /usr/local/nginx/sbin/cut_nginx_log.sh

输入以下内容： 

#!/bin/bash
# This script run at 00:00
# The Nginx logs path
logs_root_path="/home/nginx/logs/"
logs_path=${logs_root_path}$(date -d "yesterday" +"%Y")/$(date -d "yesterday" +"%m")/
mkdir -p ${logs_path}
#日志文件名 ====================================================
logs_name="weblogs"
logs_file=${logs_root_path}${logs_name}.log
cut_logs_file=${logs_path}${logs_name}_$(date -d "yesterday" +"%Y%m%d").log
mv ${logs_file} ${cut_logs_file}
tar czf ${cut_logs_file}.tar.gz ${cut_logs_file}
rm -f ${cut_logs_file}
#重启nginx
/usr/local/nginx/sbin/nginx -s reload

对这个脚本赋执行权限
# chmod +x /usr/local/nginx/sbin/cut_nginx_log.sh 

设置crontab，每天凌晨00:00切割nginx访问日志 

crontab -e 

输入以下内容： 

    00 00 * * * /bin/bash  /usr/local/nginx/sbin/cut_nginx_log.sh 

2、配置nginx负载均衡

    编辑nginx.conf

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

    在server上面增加

     upstream  www.test.com {

              server  www.test.com:8888;

              server  www.test.com:8080;

        #ip_hash;   注：如果加入了ip_hash， 这种只能适用于当某个用户连接上了一台服务器后，他登陆之后所做的一切操作都只会在那一台服务器不会跳转到另外的服务器，如果那台服务器over掉了，则会自动退出，连接到另一服务器

    }

www.test.com 是自己的服务器，最好是用域名

upstream后面的名字要与proxy_pass 这个名字一样，建议upstream后面的名字，proxy_pass 后面的名字，server_name 后面的名字一致

示例：

  upstream  www.test.com {

              server  www.test.com:8888;

              server  www.test.com:8080;

    }

  #测试

 server

  {

   listen      80;

    server_name www.test.com;

    index index.htm index.html index.jsp;

   root  /home/htdocs/web/ROOT/;

    location ~ .*$

    {

      index index.jsp;

      proxy_pass http://www.test.com; 注：做了负载均衡，这个后面就不能再加端口

    }

    access_log logs/sp.imichat.com.log combined;

    error_page  404 = /404.html;

  }

注：如果负载均衡不成功，请检查是否没有经过nginx，80端口直接被转发到了tomcat服务的端口上

3、配置tomcat集群

    优化tomcat 最大并发数，编辑server.xml

             <Connector port="8080" maxHttpHeaderSize="8192"

               maxThreads="2048" minSpareThreads="100" maxSpareThreads="200"

               enableLookups="false" redirectPort="8443" acceptCount="500"

               connectionTimeout="20000" disableUploadTimeout="true" />

            <Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1">

        <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" tcpListenAddress="127.0.0.1" />

    修改web.xml

        增加标签：<distributable/>

            直接加在</web-app> 之前就可以了，这个是加入tomcat 的session 复制的，做tomcat 集群必须需要这一步，否则用户的session 就无法正常使用.

4、安装zlib

新手在尝试安装nginx时，常常会因为缺少依赖组件，导致nginx相应模块无法安装，在执行“./configure”时常出现错误。
若在“./configure”后方加入了“--with-http_gzip_static_module”（添加gzip压缩模块）提示以下错误：

./configure: error: the HTTP gzip module requires the zlib library.You can either disable the module by using –without-http_gzip_moduleoption, or install the zlib library into the system, or build the zlib 
librarystatically from the source with nginx by using –with-zlib=<path> option.
则需要安装“zlib-devel”即可。SSH执行以下命令：

yum install -y zlib-devel

如果 命令行安装不成功，那就windows下载。linux安装

zlib-devel-1.2.3-29.el6.x86_64.rpm

安装命令：

rpm -ivh zlib-devel-1.2.3-29.el6.x86_64.rpm

5、下面这个忘了干什么的了

ln -s libpcre.so.0.0.1libpcre.so.1