Система Centos 5.4
Раз в двое суток на проекте с посещаемостью 50000 просмотров в сутки
зависает nginx. LA = 2.00(ровно и не меняется, nginx занимает ровно 100%
процессора), вроде никакого особого статуса в топе нет
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19496 nginx 25 0 77744 3252 848 R 100.2 0.1 481:38.24 nginx


17412 nginx 25 0 77336 2980 856 R 99.6 0.0 481:38.54 nginx


1 root 15 0 10344 728 612 S 0.0 0.0 0:00.92 init


1776 apache 16 0 575m 49m 24m S 0.0 0.8 3:04.40 httpd


1783 apache 16 0 577m 48m 23m S 0.0 0.8 3:04.66 httpd


1868 root 15 0 60524 1176 628 S 0.0 0.0 0:06.61 sshd


1876 root 18 0 6048 640 456 S 0.0 0.0 0:01.14 dovecot


1885 root 15 0 64112 2908 1824 S 0.0 0.0 0:01.59 dovecot-auth


1890 exim 15 0 80756 1476 720 S 0.0 0.0 0:00.07 exim


1899 nobody 15 0 51520 2212 1216 S 0.0 0.0 0:00.15 proftpd


1937 root 15 0 19708 1140 568 S 0.0 0.0 0:00.12 crond


1953 root 15 0 59716 5768 1480 S 0.0 0.1 4:10.66 xbt_tracker


1962 dovecot 18 0 33856 2196 1736 S 0.0 0.0 0:00.31 imap-login


1963 dovecot 18 0 33856 2196 1736 S 0.0 0.0 0:00.30 imap-login


1964 dovecot 18 0 33856 2196 1736 S 0.0 0.0 0:00.28 imap-login


3669 dovecot 18 0 33852 2184 1724 S 0.0 0.0 0:00.04 pop3-login


3685 dovecot 18 0 33852 2180 1724 S 0.0 0.0 0:00.04 pop3-login


3700 dovecot 18 0 33852 2184 1724 S 0.0 0.0 0:00.04 pop3-login


5192 apache 16 0 681m 131m 24m S 0.0 2.2 9:44.84 httpd


9757 apache 15 0 574m 44m 22m S 0.0 0.7 1:49.64 httpd


После, что сообщает debug.log в момент зависания:
2010/11/25 01:46:39 [notice] 16259#0: signal 17 (SIGCHLD) received
2010/11/25 01:46:39 [alert] 16259#0: worker process 17411 exited on signal
11
2010/11/25 01:46:39 [notice] 16259#0: start worker process 19496
2010/11/25 01:46:39 [notice] 16259#0: signal 29 (SIGIO) received
2010/11/25 04:39:01 [notice] 16259#0: signal 10 (SIGUSR1) received,
reopening logs
2010/11/25 04:39:01 [notice] 16259#0: reopening logs

Судя по логам апача - последний проксированный запрос пришел в 01:46:39.

Данное поведение на сервере начала появляться недавно. Похоже, после
включения кэширования анонимов.

worker_processes 1;

error_log /var/log/nginx/error.log debug;
#error_log /usr/local/nginx/logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

pid /var/run/nginx.pid;


events {
worker_connections 1024;
}


http {
include mime.types;
default_type application/octet-stream;

log_format main '$upstream_cache_status $body_bytes_sent $status $uri
$remote_addr';

access_log /usr/local/nginx/logs/access.log main;

sendfile on;
#tcp_nopush on;

keepalive_timeout 65;

gzip on;
gzip_comp_level 9;

proxy_cache_path /usr/local/nginx/cache levels=1:2 keys_zone=test:20m
inactive=20m;

server {
listen x.x.x.x:80;
server_name test.org www.test.org test.ru www.test.ru;
server_name_in_redirect off;

location / {
proxy_pass http://127.0.0.1:80/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
#no proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-For $remote_addr;

proxy_cache test;
proxy_cache_key $host$uri?$args;
proxy_no_cache $cookie_logged;
proxy_cache_bypass $cookie_logged;
proxy_cache_use_stale error timeout invalid_header http_500 http_502
http_503 http_504;

proxy_pass_header Set-Cookie;
proxy_ignore_headers "Expires" "Cache-Control";

proxy_cache_valid 200 301 302 304 1h;
client_max_body_size 16m;
client_body_buffer_size 128k;
proxy_connect_timeout 30;
proxy_send_timeout 30;
proxy_read_timeout 30;
# proxy_connect_timeout 3000000;
# proxy_send_timeout 3000000;
# proxy_read_timeout 3000000;
proxy_buffer_size 8k;
proxy_buffers 8 8k;
proxy_busy_buffers_size 32k;
proxy_temp_file_write_size 10m;

}


location ~* /sites/all/files/imagecache/ {
root /var/www/html;
error_page 404 = @backend;
}

location @backend {
proxy_pass http://127.0.0.1;
proxy_redirect off;

proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
}

}

}


*куда копать?*
--
С уважением,
Паньков Артем Владимирович.
ICQ: 842264
Мобильный: +7 903 726 19 69
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