我有一个 ubuntu 服务器和一个负载很高的网站。服务器是:
- 专用于 nginx,使用 php-fpm(无 apache),mysql 位于不同的机器上
- 有 8 GB 的 RAM
- 每秒获取大约 2000 个请求。
每个 php-fpm 进程消耗大约 65MB 的 RAM,根据top
命令:
空闲内存:
admin@myserver:~$ free -m
total used free shared buffers cached
Mem: 7910 7156 753 0 284 2502
-/+ buffers/cache: 4369 3540
Swap: 8099 0 8099
问题
最近,我遇到了很大的性能问题。响应时间非常长,非常多Gateway Timeouts
,而且在晚上,当负载变高时,90% 的用户只会看到“找不到服务器”而不是网站(我似乎无法重现这一点)
日志
我的 Nginx 错误日志充满了以下消息:
2012/07/18 20:36:48 [error] 3451#0: *241904 upstream prematurely closed connection while reading response header from upstream, client: 178.49.30.245, server: example.net, request: request: "GET /readarticle/121430 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9001", host: "example.net", referrer: "http://example.net/articles"
我尝试切换到 unix 套接字,但仍然出现这些错误:
2012/07/18 19:27:30 [crit] 2275#0: *12334 connect() to unix:/tmp/fastcgi.sock failed (2: No such file or directory) while connecting to upstream, client: 84.
237.189.45, server: example.net, request: "GET /readarticle/121430 HTTP/1.1", upstream: "fastcgi://unix:/tmp/fastcgi.sock:", host: "example.net", referrer: "http
://example.net/articles"
php-fpm 日志中充满了这些:
[18-Jul-2012 19:23:34] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 0 idle, and 75 total children
我试图将给定的参数增加到100
,但似乎仍然不够。
配置
这是我目前的配置
php-fpm
listen = 127.0.0.1:9001
listen.backlog = 4096
pm = dynamic
pm.max_children = 130
pm.start_servers = 40
pm.min_spare_servers = 10
pm.max_spare_servers = 40
pm.max_requests = 100
nginx
worker_processes 4;
worker_rlimit_nofile 8192;
worker_priority 0;
worker_cpu_affinity 0001 0010 0100 1000;
error_log /var/log/nginx_errors.log;
events {
multi_accept off;
worker_connections 4096;
}
http {
include mime.types;
default_type application/octet-stream;
access_log off;
sendfile on;
keepalive_timeout 65;
gzip on;
# fastcgi parameters
fastcgi_connect_timeout 120;
fastcgi_send_timeout 180;
fastcgi_read_timeout 1000;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_intercept_errors on;
client_max_body_size 128M;
server {
server_name example.net;
root /var/www/example/httpdocs;
index index.php;
charset utf-8;
error_log /var/www/example/nginx_error.log;
error_page 502 504 = /gateway_timeout.html;
# rewrite rule
location / {
if (!-e $request_filename) {
rewrite ^(.*)$ /index.php?path=$1 last;
}
}
location ~* \.php {
fastcgi_pass 127.0.0.1:9001;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_script_name;
include fastcgi_params;
}
}
}
我将非常感谢有关如何识别问题以及我可以调整哪些参数来解决此问题的任何建议。或者也许 8GB 的 RAM 不足以应付这种负载?