Linux 下Nginx 的安装及负载均衡的简单配置

这次发布程序需要均衡负载，网上看了一下这方便的东西，觉得很不错，学完之后做下总结，一遍后期用到。

1、安装nginx之前需要安装的两个依赖，pcre-x.x.x.tar.gz 和pcre-devel-x.x.x.rpm这两个包（具体这两个有什么用处也没仔细研究过，不安装确实再安装nginx时失败）

1.1安装1.安装pcre-x.x.x.tar

tar zxvf pcre-x.x.x.tar.gz
cd pcre-x.x.x
./configure
make && make install  

1.2.安装pcre-devel-x.x.x.rpm

rpm -ivh pcre-devel-x.x.x.rpm

2.安装nginx-x.x.x.tar.gz

tar zxvf nginx-x.x.x.tar.gz
cd nginx-x.x.x
./configure --with-http_stub_status_module --prefix=/usr/local/nginx --with-debug  --with-http_sub_module
make && make install  

3.安装完成后修改配置文件

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

修改后的配置文件如下

#user  nobody;
user root;
worker_processes  ;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
    worker_connections  ;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  ;
    keepalive_timeout  ;

    #gzip  on;

   upstream Servers {

         server   ip:port weight=;
         server   ip:port weight=;

    }

        server {
        listen       ;
        server_name   server  www.btrcrm.com ;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass        http://Servers;
            root   html;
            index  index.html index.htm;
        }

        #error_page                /.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page        /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
     #}
 }
}

配置完成后测试是否正常

/usr/local/nginx/sbin/nginx -t  

接着启动nginx

/usr/local/nginx/sbin/nginx  

若修改后配置文件或者将配置文件覆盖修改的 ，需要执行：

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

修改后需要重启nginx，发现重启不了端口被占用，则用一下命令解决

netstat  grep    --查看端口80占用

sudo fuser -k /tcp   --关闭端口程序，然后重启即可