Здравствуйте.
Имеются 1 фронтэнд, 4 бэкенда и 2 сервера mysql
Никак не могу справиться с одной проблемой: периодически в логе ngnix'а
появляются строки следующего вида
2008/07/17 14:34:40 [error] 14415#0: *3460073 upstream prematurely
closed connection while reading response header from upstream, ...
upstream: "fastcgi://192.168.0.1:9000"
2008/07/17 14:34:40 [error] 14415#0: *3460070 upstream prematurely
closed connection while reading response header from upstream, ...
upstream: "fastcgi://192.168.0.3:9000"
2008/07/17 14:34:40 [error] 14415#0: *3460069 upstream prematurely
closed connection while reading response header from upstream, ...
upstream: "fastcgi://192.168.0.4:9000"
2008/07/17 14:34:40 [error] 14410#0: *3460247 upstream prematurely
closed connection while reading response header from upstream, ...
upstream: "fastcgi://192.168.0.4:9000"
после чего зачастую проскакивает no live upstreams while connecting to
upstream
иногда бывают такие:
2008/07/17 14:54:21 [error] 14412#0: *3760898 kevent() reported about an
closed connection (54: Connection reset by peer) while reading response
header from upstream, ... upstream: "fastcgi://192.168.0.2:9000"
2008/07/17 14:54:21 [error] 14412#0: *3760900 kevent() reported about an
closed connection (54: Connection reset by peer) while reading response
header from upstream, ... upstream: "fastcgi://192.168.0.3:9000"
2008/07/17 14:54:21 [error] 14412#0: *3746025 kevent() reported about an
closed connection (54: Connection reset by peer) while reading response
header from upstream, ... upstream: "fastcgi://192.168.0.3:9000"
Причем появляются эти строчки пачками в одну секунду штук по 5-50 с
периодичностью раз в 5-10 минут (в зависимости от нагрузки), в основном
со всех бэкендов.
Утром например, когда кол-во посетителей небольшое этого не происходит.
Причем в реквесте часто бывают скрипты, которые вообще не используют
mysql. В одном из таких тестовых скриптов вообще пхпшного кода нет
(скрипт из одной строчки вида <input id=asd value=1>) :) Но бэкенд все
равно разрывает соединение.
Я думаю (но могу ошибаться) mysql тут ни при чем, а раз в одну секунду
разрывается соединение со всеми бэками, то и они ни при чем.
Подозреваю, что клиенты в этот момент получают 502-ю, т.к. сам бывало на
нее нарывался.
В дебаг логе nginx'а следующее (не уверен, все ли что нужно захватил)
2008/07/16 16:17:52 [debug] 35120#0: *405143 http init upstream, client
timer: 0
2008/07/16 16:17:52 [debug] 35120#0: *405143 kevent set event: 534:
ft:-2 fl:0025
2008/07/16 16:17:52 [debug] 35120#0: *405143 http script copy: ""
...
2008/07/16 16:17:52 [debug] 35120#0: *405143 fastcgi param:
"X_FORWARDED_FOR: 123.123.123.123"
2008/07/16 16:17:52 [debug] 35120#0: *405143 http script copy: ""
2008/07/16 16:17:52 [debug] 35120#0: *405143 fastcgi param:
"SSL_CLIENT_SERIAL: 0"
2008/07/16 16:17:52 [debug] 35120#0: *405143 http cleanup add:
00000000006EDF40
2008/07/16 16:17:52 [debug] 35120#0: *405143 get rr peer, try: 4
2008/07/16 16:17:52 [debug] 35120#0: *405143 get rr peer, current: 0 2
2008/07/16 16:17:52 [debug] 35120#0: *405143 socket 237
2008/07/16 16:17:52 [debug] 35120#0: *405143 connect to
192.168.0.2:9000, fd:237 #405294
2008/07/16 16:17:52 [debug] 35120#0: *405143 kevent set event: 237:
ft:-1 fl:0025
2008/07/16 16:17:52 [debug] 35120#0: *405143 kevent set event: 237:
ft:-2 fl:0025
2008/07/16 16:17:52 [debug] 35120#0: *405143 http upstream connect: -2
2008/07/16 16:17:52 [debug] 35120#0: *405143 event timer add: 237:
75000:1216210747795
2008/07/16 16:17:58 [debug] 35120#0: *405143 http upstream check client,
write event:1, "/blablabla.php"
2008/07/16 16:17:58 [debug] 35120#0: *405143 http upstream process header
2008/07/16 16:17:58 [debug] 35120#0: *405143 malloc: 000000000110E000:32768
2008/07/16 16:17:58 [debug] 35120#0: *405143 recv: eof:1, avail:0, err:0
2008/07/16 16:17:58 [error] 35120#0: *405143 upstream prematurely closed
connection while reading response header from upstream, .....
2008/07/16 16:17:58 [debug] 35120#0: *405143 http next upstream, 2
2008/07/16 16:17:58 [debug] 35120#0: *405143 free rr peer 4 4
2008/07/16 16:17:58 [debug] 35120#0: *405143 free rr peer failed: 0 -5
2008/07/16 16:17:58 [debug] 35120#0: *405143 close http upstream
connection: 237
2008/07/16 16:17:58 [debug] 35120#0: *405143 event timer del: 237:
1216210747795
2008/07/16 16:17:58 [debug] 35120#0: *405143 get rr peer, try: 3
2008/07/16 16:17:58 [debug] 35120#0: *405143 socket 140
2008/07/16 16:17:58 [debug] 35120#0: *405143 connect to
192.168.0.3:9000, fd:140 #406707
2008/07/16 16:17:58 [debug] 35120#0: *405143 kevent set event: 140:
ft:-1 fl:0025
2008/07/16 16:17:58 [debug] 35120#0: *405143 kevent set event: 140:
ft:-2 fl:0025
2008/07/16 16:17:58 [debug] 35120#0: *405143 http upstream connect: -2
или вот, например
2008/07/16 16:17:49 [debug] 35117#0: *404981 connect to
192.168.0.3:9000, fd:560 #405020
2008/07/16 16:17:49 [debug] 35117#0: *404981 kevent set event: 560:
ft:-1 fl:0025
2008/07/16 16:17:49 [debug] 35117#0: *404981 kevent set event: 560:
ft:-2 fl:0025
2008/07/16 16:17:49 [debug] 35117#0: *404981 http upstream connect: -2
2008/07/16 16:17:49 [debug] 35117#0: *404981 event timer add: 560:
75000:1216210744998
2008/07/16 16:17:59 [debug] 35117#0: *404981 post event 0000000000DA58A0
2008/07/16 16:17:59 [debug] 35117#0: *404981 post event 0000000000AFAA20
2008/07/16 16:17:59 [debug] 35117#0: *404981 post event 0000000000DA6A20
2008/07/16 16:17:59 [debug] 35117#0: *404981 delete posted event
0000000000DA6A20
2008/07/16 16:17:59 [debug] 35117#0: *404981 http upstream send request
handler
2008/07/16 16:17:59 [debug] 35117#0: *404981 http upstream send request
2008/07/16 16:17:59 [debug] 35117#0: *404981 chain writer buf fl:0 s:1320
2008/07/16 16:17:59 [debug] 35117#0: *404981 chain writer in:
000000000106EF68
2008/07/16 16:17:59 [debug] 35117#0: *404981 writev: 1320 of 1320
2008/07/16 16:17:59 [debug] 35117#0: *404981 chain writer out:
0000000000000000
2008/07/16 16:17:59 [debug] 35117#0: *404981 event timer del: 560:
1216210744998
2008/07/16 16:17:59 [debug] 35117#0: *404981 event timer add: 560:
180000:1216210859644
2008/07/16 16:17:59 [debug] 35117#0: *404981 http upstream process header
2008/07/16 16:17:59 [debug] 35117#0: *404981 malloc: 00000000006E9000:32768
2008/07/16 16:17:59 [debug] 35117#0: *404981 recv: eof:1, avail:0, err:0
2008/07/16 16:17:59 [error] 35117#0: *404981 upstream prematurely closed
connection while reading response header from upstream, .....
2008/07/16 16:17:59 [debug] 35117#0: *404981 http next upstream, 2
2008/07/16 16:17:59 [debug] 35117#0: *404981 free rr peer 4 4
2008/07/16 16:17:59 [debug] 35117#0: *404981 free rr peer failed: 2 -11
2008/07/16 16:17:59 [debug] 35117#0: *404981 close http upstream
connection: 560
ktrace'ом бэкендов ничего не смог выловить. Видимо просто не умею его
готовить :)
Схема следующая:
---
один фронтэнд - FreeBSD 6.2-RELEASE-p7 amd64
nginx 0.6.32 (до этого был nginx 0.5.34 - ситуация такая же) ставился из
портов
netstat -Lan
tcp4 0/0/4096 123.123.123.123.80
netstat -m
6652/9503/16155 mbufs in use (current/cache/total)
2249/7867/10116/32768 mbuf clusters in use (current/cache/total/max)
2231/6351 mbuf+clusters out of packet secondary zone in use (current/cache)
6161K/18109K/24270K bytes allocated to network (current/cache/total)
ngnix.conf:
user www www;
worker_processes 8;
...
events {
worker_connections 25000;
use kqueue;
}
http {
...
client_header_timeout 1m;
client_body_timeout 1m;
send_timeout 1m;
client_header_buffer_size 32k;
large_client_header_buffers 16 16k;
gzip on;
gzip_min_length 1100;
gzip_buffers 4 8k;
gzip_types text/plain text/css
application/x-javascript;
output_buffers 1 32k;
postpone_output 1460;
sendfile on;
sendfile_max_chunk 128k;
tcp_nopush on;
tcp_nodelay on;
send_lowat 12000;
keepalive_timeout 75 20;
fastcgi_hide_header x-powered-by;
fastcgi_ignore_client_abort off;
fastcgi_next_upstream error;
upstream backend
{
server 192.168.0.1:9000 weight=10;
server 192.168.0.2:9000 weight=10;
server 192.168.0.3:9000 weight=10;
server 192.168.0.4:9000 weight=10;
}
server {
listen 123.123.123.123:80;
server_name www.***.ru ***.ru;
error_log /var/log/nginx/nginx-error.log
error;
client_body_buffer_size 1024k;
client_max_body_size 4m;
...
location ~ \.php$
{
access_log off;
error_log
/var/log/nginx/php-error.log error;
fastcgi_pass backend;
fastcgi_index index.php;
fastcgi_connect_timeout 75;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 32k;
fastcgi_buffers 8 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_param SCRIPT_FILENAME
/var/www/www.***.ru/php/$fastcgi_script_name;
...
---
четыре бездисковых бэкенда FreeBSD 7.0-RELEASE-p1 amd64 (раньше было
FreeBSD 6.2, php 5.2.4 без php-fpm патча - такая же ситуация)
php 5.2.6 + php-fpm 0.5.8-rc1
netstat -Lan
tcp4 0/0/4096 *.9000
netstat -m
262/3578/3840 mbufs in use (current/cache/total)
260/3624/3884/25600 mbuf clusters in use (current/cache/total/max)
260/2812 mbuf+clusters out of packet secondary zone in use (current/cache)
585K/9030K/9616K bytes allocated to
network (current/cache/total)
php-fpm.conf:
...
<section name="pool">
<value name="name">first</value>
<value name="listen_address">0.0.0.0:9000</value>
...
<value name="max_children">100</value>
...
<value
name="request_execution_timeout">601s</value>
<value name="rlimit_files">2048</value>
<value name="rlimit_core">0</value>
...
<value name="max_requests">500</value>
...
Где копать? На фронтэнде или все таки бэкенды выеживаются?
Заранее благодарю :)
