php - 一段时间后nginx拒绝连接

Question

我的 nginx 配置有问题，我的服务器工作正常，但 1 或 2 天后它只是挂起并停止响应。无法再连接到服务器了。

(7) Failed to connect to XX.XX.XX.XX port 80: Connection refused

该服务器的主要工作是运行繁重的 PHP 任务，我每 5 秒运行一次 cron 作业来处理许多任务。重启有帮助，nginx 在接下来的 1-2 天内再次正常工作。我没有任何错误日志，nginx 不会在/var/log/nginx/error.log 中报告任何内容。它只是使所有连接失败。任何想法从哪里开始寻找问题？

我在 Ubuntu 16.04、2 个 CPU、4 GB 内存和 PHP 7.0 上运行 nginx。
nginx版本:nginx/1.10.0(Ubuntu)

这是配置文件:

 user www-data;
 worker_processes 2;
 pid /run/nginx.pid;

 events {
  worker_connections 4096;
  #multi_accept on;
 }

http {

##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 300;
types_hash_max_size 2048;
server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;

##
# SSL Settings
##

ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

##
# Logging Settings
##

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

##
# Gzip Settings
##

gzip on;
gzip_disable "msie6";

# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

##
# Virtual Host Configs
##

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}

这是默认文件:

server {
 large_client_header_buffers 4 128k;
 listen XX:XX:XX:XX:80;

 set $root_path '/var/www/web/public/';

 root $root_path;
 index index.php;

 server_name XX:XX:XX:XX;

 location / {
    # First attempt to serve request as file, then
    # as directory, then fall back to displaying a 404.
    try_files $uri $uri/ /index.php?$query_string;
 }

 location ~ \.php$ {
    include snippets/fastcgi-php.conf;
    fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
    fastcgi_read_timeout 14400;

    proxy_set_header   Connection "";
    proxy_http_version 1.1;
 }

 location /status {
        stub_status on;
        access_log  off;
        allow XX:XX:XX:XX;
        deny all;
 }

 location ~* ^/(css|img|js|flv|swf|download)/(.+)$ {
    root $root_path;
 }

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

最重要的是，我运行的 cron 作业，例如:

* * * * * sleep 5; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 10; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 15; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 20; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 25; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 30; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 35; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 40; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 45; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1
* * * * * sleep 50; curl --request GET http://XX:XX:XX:XX/queue/fire > /dev/null 2>&1

等等

更新:

PHP FPM 状态

 * php7.0-fpm.service - The PHP 7.0 FastCGI Process Manager
   Loaded: loaded (/lib/systemd/system/php7.0-fpm.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2017-01-13 10:46:41 CET; 3 days ago
  Process: 1439 ExecStartPre=/usr/lib/php/php7.0-fpm-checkconf (code=exited, status=0/SUCCESS)
 Main PID: 1662 (php-fpm7.0)
   Status: "Processes active: 0, idle: 25, Requests: 164215, slow: 0, Traffic: 0req/sec"
    Tasks: 26
   Memory: 377.3M
      CPU: 5h 57min 32.279s
   CGroup: /system.slice/php7.0-fpm.service
           |- 1662 php-fpm: master process (/etc/php/7.0/fpm/php-fpm.conf)                      
           |- 1752 php-fpm: pool www                                                            
           |- 8751 php-fpm: pool www                                                            
           |-12078 php-fpm: pool www                                                            
           |-14053 php-fpm: pool www                                                            
           |-14338 php-fpm: pool www                                                            
           |-14639 php-fpm: pool www                                                            
           |-14763 php-fpm: pool www                                                            
           |-16188 php-fpm: pool www                                                            
           |-16212 php-fpm: pool www                                                            
           |-16900 php-fpm: pool www                                                            
           |-17620 php-fpm: pool www                                                            
           |-17621 php-fpm: pool www                                                            
           |-17766 php-fpm: pool www                                                            
           |-18802 php-fpm: pool www                                                            
           |-19084 php-fpm: pool www                                                            
           |-22064 php-fpm: pool www                                                            
           |-24245 php-fpm: pool www                                                            
           |-24690 php-fpm: pool www                                                            
           |-25120 php-fpm: pool www                                                            
           |-27714 php-fpm: pool www                                                            
           |-29415 php-fpm: pool www                                                            
           |-30182 php-fpm: pool www                                                            
           |-30391 php-fpm: pool www                                                            
           |-32053 php-fpm: pool www                                                            
           `-32358 php-fpm: pool www                                                            

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Answer 1

我会检查 php fpm 日志。也许用完了 php fpm 进程。