502错误的网关 [英] 502 Bad Gateway
问题描述
我经常遇到的问题是，如果我转到服务器上使用php的页面，则会收到"502 Bad Gateway"错误.
I'm having the problem that more often than not, if I go to a page on my server that uses php, I get the "502 Bad Gateway" error.
错误日志:
/var/log/nginx/error.log每分钟显示大约3个该错误的副本:
/var/log/nginx/error.log shows about 3 copies of this error per minute:
2016/08/27 15:07:22 [error] 17309#0: *53554 connect() to unix:/var/run/php5-fpm.sock
failed (11: Resource temporarily unavailable) while connecting to upstream, client:
[dedicated server], server: localhost, request: "POST /xmlrpc.php HTTP/1.0",
upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: [my IP address]
nginx或php5-fpm进程的CPU负载有时很巨大(超过100％)，但有时却很明显(2％)，很少那么微不足道.
The CPU load from nginx or php5-fpm processes is sometimes huge (in excess of 100%), but sometimes just noticeable (2%), rarely insignificant.
在syslog(！)中，我看到了很多东西:
Here's something I see a lot of in syslog (!):
Aug 27 15:17:21 [site] avahi-daemon[871]: Invalid response packet from host
[some IP address that isn't mine and nslookup never heard of].
到目前为止我已经尝试过的事情:
-
apt-get update - 已删除并重新安装
php5，php5-cgi和php5-fpm - 确保
apache2不在我的系统上运行 -
已添加 到
nginx.conf，在http {...}中:
apt-get update- removed and reinstalled
php5,php5-cgi, andphp5-fpm - made sure
apache2is not running on my system added this to
nginx.conf, inside ahttp {...}:
fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
确保运行nginx的同一用户拥有/var/run/php5-fpm.sock.这是与/etc/php5/fpm/pool.d/www.conf中的listen.owner和listen.group引用的所有者相同.
ensured that the same user that runs nginx, owns /var/run/php5-fpm.sock. This is the same owner referenced as listen.owner and listen.group in /etc/php5/fpm/pool.d/www.conf.
试图将对该套接字的引用更改为TCP/IP套接字:
tried changing the references to that socket to a TCP/IP socket:
/etc/nginx/sites-available/default包含行fastcgi_pass unix:127.0.0.1:9000;
/etc/php5/fpm/pool.d/www.conf包含行listen = 127.0.0.1:9000;
由于这使所有php页面均无法正常工作，因此我恢复了该更改.
Since this made none of the php pages ever work, I reverted that change.
php5-fpm设置:
我怀疑这是php5占用内存或CPU时间的问题，因为(a)经常会这样，并且(b)如果我没有收到504错误，那么在使用php的任何页面上加载时间都非常慢.我认为这是/etc/php5/fpm/pool.d/www.conf文件的相关部分:
I suspect it's a problem with php5 eating up memory or CPU time since (a) it often does and (b) if I don't get that 504 error, I get a very slow load time on any page using php. Here's what I think is the relevant part of the /etc/php5/fpm/pool.d/www.conf file:
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
所以:我还应该尝试什么? TIA.
So: what else should I try? TIA.
推荐答案
您可以检查以下内容，
1- sudo service php5-fpm status，如果没有运行，请尝试启动
1- sudo service php5-fpm status, try to start that if no running
2-将套接字更改为tcp/ip时，删除unix，即在/etc/nginx/sites-available/default文件中，在php块中将fastcgi_pass unix:/var/run/php5-fpm.sock;更改为fastcgi_pass 127.0.0.1:9000;，在/etc/php5/fpm/pool.d/www.conf文件中将listen = /var/run/php5-fpm.sock更改为listen = 127.0.0.1:9000
2- while changing socket to tcp/ip remove unix, ie, in the /etc/nginx/sites-available/default file, in the php block change fastcgi_pass unix:/var/run/php5-fpm.sock; to fastcgi_pass 127.0.0.1:9000; and in /etc/php5/fpm/pool.d/www.conf file change listen = /var/run/php5-fpm.sock to listen = 127.0.0.1:9000
3-尝试增加php的进程管理器，即pm.max_children=40，pm.start_servers = 10，pm.min_spare_servers = 5，pm.max_spare_servers = 10
3- try to increase the process managers for php, i.e., pm.max_children=40, pm.start_servers = 10, pm.min_spare_servers = 5, pm.max_spare_servers = 10
4-关闭nginx.conf的keepalive连接
4- switch off keepalive connections from nginx.conf
5-尝试实施缓存(已针对几乎静态的内容完成，因此所有请求都不会打扰php).
5- try to implement caching (is done for almost static content, so that all requests do not bother php) if possible.
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