是我们第一次设置Nginx和PHP-FPM。一周前，我们使用Apache提供网页服务，但我们决定尝试Nginx组合，我们面临着几个问题。
我们有一个运行Ubuntu 14.04 LTS Trusty的虚拟机。在其他实用程序中，该机器使用PHP-FPM和MySQL运行Nginx，当问题出现时：
- 在同一网络中，所有同事（约10人）都可以毫无问题地访问网络，而有一位同事不能（错误504）
- 从外部来看，一些同事可以毫无问题地访问网络，而另一些同事则看到了504错误。例如，在我的情况下，我可以通过家里的WiFi接入，但如果我使用手机的3G，我就不能。一些同事则面临着相反的情况，他们可以通过3G接入，但不能通过WiFi接入。其他人无法访问
我们已经得出结论，客户端可以连接到Nginx，但Nginx在将请求重定向到FPM（可以通过端口7777访问）时没有收到响应，并显示超时错误。我们专注于解决Nginx和FPM之间的通信问题，但几个小时后我们还没有找到解决方案。
注意：此问题在我们设置的四个虚拟机中重复出现。
Nginx错误日志（注意：主机名和ip已被抑制）
2014/09/27 01:57:26 [error] 12686#0: *8 upstream timed out (110: Connection timed out) while reading response header from upstream, client: <ip>, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "<hostname>"
2014/09/27 02:03:26 [error] 12718#0: *1 upstream timed out (110: Connection timed out) while reading response header from upstream, client: <ip>, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "<hostname>"
2014/09/27 02:05:29 [error] 12744#0: *1 upstream timed out (110: Connection timed out) while reading response header from upstream, client: <ip>, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "<hostname>"
文件：/etc/nginx/nginx.conf
user www-data;
worker_processes 4;
worker_rlimit_nofile 8192;
error_log /var/log/nginx/error.log;
pid /var/run/nginx.pid;
events {
worker_connections 4096;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
sendfile on;
server_tokens on;
types_hash_max_size 1024;
types_hash_bucket_size 512;
server_names_hash_bucket_size 64;
server_names_hash_max_size 512;
keepalive_timeout 65;
tcp_nodelay on;
gzip on;
gzip_disable "MSIE [1-6]'.(?!.*SV1)";
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
文件：/etc/nginx/sites-available/default.conf
server {
listen 80;
root /var/www/html/web;
location / {
# try to serve file directly, fallback to app.php
try_files $uri /app.php; #$is_args$args;
}
location ~ ^/(app|app_dev|config)'.php(/|$) {
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_split_path_info ^(.+'.php)(/.*)$;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param HTTPS off;
}
error_log /var/log/nginx/error.log;
access_log /var/log/nginx/access.log;
}
文件：/etc/nginx/fastcgi_params
注意：只添加了行fastcgi_param REQUEST_SCHEME $scheme;。
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 REQUEST_SCHEME $scheme;
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 HTTPS $https if_not_empty;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
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;
文件：/etc/php5/fpm/php-fpm.conf
;;;;;;;;;;;;;;;;;;;;;
; FPM Configuration ;
;;;;;;;;;;;;;;;;;;;;;
; All relative paths in this configuration file are relative to PHP's install
; prefix.
; Include one or more files. If glob(3) exists, it is used to include a bunch of
; files from a glob(3) pattern. This directive can be used everywhere in the
; file.
include=/etc/php5/fpm/pool.d/*.conf
;;;;;;;;;;;;;;;;;;
; Global Options ;
;;;;;;;;;;;;;;;;;;
[global]
; Pid file
; Default Value: none
pid = /var/run/php5-fpm.pid
request_terminate_timeout=30s
; Error log file
; Default Value: /var/log/php-fpm.log
error_log = /var/log/php5-fpm.log
; Log level
; Possible Values: alert, error, warning, notice, debug
; Default Value: notice
log_level = notice
; If this number of child processes exit with SIGSEGV or SIGBUS within the time
; interval set by emergency_restart_interval then FPM will restart. A value
; of '0' means 'Off'.
; Default Value: 0
emergency_restart_threshold = 0
; Interval of time used by emergency_restart_interval to determine when
; a graceful restart will be initiated. This can be useful to work around
; accidental corruptions in an accelerator's shared memory.
; Available Units: s(econds), m(inutes), h(ours), or d(ays)
; Default Unit: seconds
; Default Value: 0
emergency_restart_interval = 0
; Time limit for child processes to wait for a reaction on signals from master.
; Available units: s(econds), m(inutes), h(ours), or d(ays)
; Default Unit: seconds
; Default Value: 0
process_control_timeout = 0
; The maximum number of processes FPM will fork. This has been design to control
; the global number of processes when using dynamic PM within a lot of pools.
; Use it with caution.
; Note: A value of 0 indicates no limit
; Default Value: 0
; process.max = 128
; Specify the nice(2) priority to apply to the master process (only if set)
; The value can vary from -19 (highest priority) to 20 (lower priority)
; Note: - It will only work if the FPM master process is launched as root
; - The pool process will inherit the master process priority
; unless it specified otherwise
; Default Value: no set
; process.priority = -19
; Send FPM to background. Set to 'no' to keep FPM in foreground for debugging.
; Default Value: yes
;daemonize = yes
;;;;;;;;;;;;;;;;;;;;
; Pool Definitions ;
;;;;;;;;;;;;;;;;;;;;
; See /etc/php5/fpm/pool.d/*.conf
文件：/etc/php5/fpm/pool.d/www.conf
;; For readability, comments have been suppressed.
[www]
user = www-data
group = www-data
listen = /var/run/php5-fpm.sock
listen.backlog = -1
listen.owner = www-data
listen.group = www-data
listen.mode = 0666
listen.allowed_clients = 127.0.0.1
pm = dynamic
pm.max_children = 50
pm.start_servers = 5
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 0
ping.response = pong
slowlog = /var/log/php-fpm/www-slow.log
catch_workers_output = no
php_admin_value[error_log] = /var/log/php-fpm/www-error.log
php_admin_flag[log_errors] = on
到目前为止我们所做的工作（这些配置可能不会反映在上述文件中）
- 将Nginx和FPM用户设置为相同（www数据）
- 重新启动服务和计算机
- 在nginx配置中设置
proxy_read_timeout - 将
max_execution_time和request_terminate_timeout设置为300（分别在php.ini和nginx.conf上） - 在nginx配置中增加
worker_process和worker_connections的数量 - 在nginx-config和php-fpm上，将
Listen的值从/var/run/php5-pm.sock更改为127.0.0.1:7777
我们将继续研究解决方案，如果找到，我们将在这里发布。谢谢
尝试这个
server {
listen 80;
server_name *.domain_name.com ;
#add this begin
large_client_header_buffers 4 16k;
client_max_body_size 300m;
client_body_buffer_size 128k;
proxy_connect_timeout 600;
proxy_read_timeout 600;
proxy_send_timeout 600;
proxy_buffer_size 64k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
#add this end
........................
｝
已解决
问题似乎存在于PHP代码中。使用xdebug时，没有设置remote_host属性，我们仍然不知道为什么xdebug过程会根据远程主机随机执行。
注意：当我们只使用Apache时，这个问题从未发生过。当使用Nginx+php-fpm时，这种情况就开始发生了，但没关系，问题终于解决了。
谢谢。