【求助】nginx在访问量稍大的情况下，出现503 Service Temporarily Unavailable错误

u013134871 2020-04-01 09:58:09

当前环境是LNMP，使用jmeter测试时，300的并发，循环5次，当中有20%的请求会出现503错误，看了网上的资料是说，做了ip访问次数限制（limit_conn），但是我再配置文件中没有设置，比较头大，请各位帮下忙，十分感谢
下面是nginx的配置文件：
/etc/nginx/nginx.conf：

# For more information on configuration, see:

#   * Official English Documentation: http://nginx.org/en/docs/

#   * Official Russian Documentation: http://nginx.org/ru/docs/



user nginx;

worker_processes auto;

worker_rlimit_nofile 65535;

error_log /var/log/nginx/error.log;

pid /run/nginx.pid;



# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.

include /usr/share/nginx/modules/*.conf;



events {

    worker_connections 20480;

    use epoll;

}



http {

    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  /var/log/nginx/access.log  main;



    sendfile            on;

    tcp_nopush          on;

    tcp_nodelay         on;

    keepalive_timeout   200;

    types_hash_max_size 2048;



    fastcgi_connect_timeout 300;

    fastcgi_send_timeout 300;

    fastcgi_read_timeout 300;



    include             /etc/nginx/mime.types;

    default_type        application/octet-stream;



    # Load modular configuration files from the /etc/nginx/conf.d directory.

    # See http://nginx.org/en/docs/ngx_core_module.html#include

    # for more information.

    include /etc/nginx/conf.d/*.conf;



    server {

        listen       80 default_server;

        listen       [::]:80 default_server;

        server_name  _;

        root         /usr/share/nginx/html;



        # Load configuration files for the default server block.

        include /etc/nginx/default.d/*.conf;



        location / {

        }



        error_page 404 /404.html;

            location = /40x.html {

        }



        error_page 500 502 503 504 /50x.html;

            location = /50x.html {

        }

    }



# Settings for a TLS enabled server.

#

#    server {

#        listen       443 ssl http2 default_server;

#        listen       [::]:443 ssl http2 default_server;

#        server_name  _;

#        root         /usr/share/nginx/html;

#

#        ssl_certificate "/etc/pki/nginx/server.crt";

#        ssl_certificate_key "/etc/pki/nginx/private/server.key";

#        ssl_session_cache shared:SSL:1m;

#        ssl_session_timeout  10m;

#        ssl_ciphers HIGH:!aNULL:!MD5;

#        ssl_prefer_server_ciphers on;

#

#        # Load configuration files for the default server block.

#        include /etc/nginx/default.d/*.conf;

#

#        location / {

#        }

#

#        error_page 404 /404.html;

#            location = /40x.html {

#        }

#

#        error_page 500 502 503 504 /50x.html;

#            location = /50x.html {

#        }

#    }



}

/etc/nginx/conf.d/default.conf：

server {

    listen 80;

    server_name 127.0.0.1;

    error_page 404 /404.html;

    error_page 500 502 503 504 /50x.html;

   #   \.php 只处理动态请求，对于静态资源请求由下面的 location匹配和处理

    location ~ \.php {

            root /www/html;

            fastcgi_pass 127.0.0.1:9000;

            #包含nginx服务器传递给fastcgi程序的参数，php中通过$_SERVER['参数名']可获取

            include   fastcgi.conf;

            #定义变量$fastcgi_script_name_new赋值为$fastcgi_script_name变量

            set $path_info "";

            set $fastcgi_script_name_new $fastcgi_script_name;

            #判断url是否是pathinfo形式的，如果是则把这个url分割成两部分，index.php入口文件之后的pathinfo部分存入$path_info变量中，剩下的部分和$document_root根目录定位index.php入口文件在文件系统中的绝对路径 .



          if ($fastcgi_script_name ~*   "^(.+\.php)(/.+)$"  ) {

                    set $fastcgi_script_name_new $1;

                    set $path_info $2;

            }



                    #对fastcgi.conf中的SCRIPT_FILENAME和SCRIPT_NAME fastcgi参数进行重写,目的是指定入口文件在文件系统中的绝对路径给script_filename参数，让fastcgi知道index.php文件位置。

                    fastcgi_param   SCRIPT_FILENAME   $document_root$fastcgi_script_name_new;

                    fastcgi_param   SCRIPT_NAME   $fastcgi_script_name_new;

                    #定义一个新的nginx服务器传递给fastcgi的参数PATH_INFO,thinkphp需要这个入口文件index.php后的pathinfo信息

                    fastcgi_param   PATH_INFO $path_info;

    }

# 用来匹配静态资源，如果不是静态资源就重写，然后重新轮训所有的location块，由上面的location块匹配后动态处理这个请求

    location / {

        root /www/html;

        index index.php index.html index.htm;



        if (!-e  $request_filename){

                rewrite ^(.*)$ /index.php$1 last;

        }

    }

}