Depois de você dizer quais módulos você tinha, eu notei que você disse EAccelerator, que tem um bug (bug tracker link aqui ) que faz com que o Apache bloqueie em loop infinito e traga o servidor para perto, tente desabilitá-lo e veja o que acontece.
Eu tenho um problema intermitente muito estranho. Ele ocorre em um servidor de hospedagem compartilhada que executa CentOS e Apache / 2.2.8, atendendo principalmente sites baseados em PHP a uma taxa entre 10 a 30 solicitações / s. 3,5 GB de RAM, kernel 2.6.9-67.0.7ELsmp no caso que importa.
O que acontece é que, cerca de uma vez por semana (mas aparentemente aleatoriamente sem correlação), o apache recebe solicitações de manipulação "entupidas" para apenas UM domínio, e normalmente a maioria dos retestes são todos para o mesmo URL. Eu sei que o problema ocorre porque a carga passa pelo telhado. (A carga chega a 50 ou 100, se eu não parar, a carga atinge 200!) A única correção que encontrei é: killall -9 httpd; /etc/init.d/httpd restart .
Se eu verificar / server-status quando isso acontecer, a saída será semelhante à seguinte. Note que sempre acontece neste site, mas cerca de 75% do tempo o site é o culpado: EDIT : Isso agora está acontecendo em um servidor completamente diferente, então é não é específico para um determinado script.
UPDATE: Mudamos todos os sites deste servidor para uma nova máquina virtual em um novo hardware. Discos mais rápidos, mais RAM. A questão persiste, na verdade é ainda pior! Alguma ideia? Eu teria prazer em oferecer uma recompensa gigantesca para a resposta correta, mas estou relutante em realmente oferecer uma, já que esta questão passou anos sem uma resposta correta à vista.
Apache Server Status for localhost
Server Version: Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.7a DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 PHP/5.2.6 mod_perl/2.0.4 Perl/v5.8.8
Server Built: Jun 7 2008 09:35:37
Current Time: Friday, 17-Jul-2009 10:15:40 EDT
Restart Time: Friday, 03-Jul-2009 12:36:59 EDT
Parent Server Generation: 3
Server uptime: 13 days 21 hours 38 minutes 40 seconds
Total accesses: 10343186 - Total Traffic: 111.6 GB
CPU Usage: u1710.63 s2129.19 cu.41 cs0 - .32% CPU load
8.61 requests/sec - 97.4 kB/second - 11.3 kB/request
250 requests currently being processed, 0 idle workers
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWKWWWWWWWWWWWWWWWWWW......
Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with no current process
Srv PID Acc M CPU SS Req Conn Child Slot Client VHost Request
0-3 3282 0/52/316180 W 1.47 41802 0 0.0 0.54 3849.21 209.249.53.104 zachdotsey.com GET /wordpress/2007/08/18/the-body-exhibition/ HTTP/1.0
1-3 30061 0/191/313974 W 34.46 44051 0 0.0 2.62 3400.19 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
2-3 2720 1/23/307812 W 0.13 42298 0 0.5 0.01 3479.29 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
3-3 1733 0/382/306392 W 3.59 41744 0 0.0 3.67 3383.63 75.101.200.204 zachdotsey.com GET /wordpress/2007/08/18/the-body-exhibition/ HTTP/1.0
4-3 3141 0/132/305071 W 3.52 41776 0 0.0 2.20 3335.79 209.249.53.236 zachdotsey.com GET /wordpress/2007/08/18/the-body-exhibition/ HTTP/1.0
5-3 31819 0/73/300070 W 0.79 43932 0 0.0 2.05 3349.65 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
6-3 6799 0/13/294060 W 0.16 40354 0 0.0 0.25 3261.88 76.23.230.184 zachdotsey.com GET /wordpress/?p=111 HTTP/1.1
7-3 4334 0/92/289873 W 0.42 40277 0 0.0 0.36 3211.94 72.233.56.144 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
8-3 18326 0/11/294687 W 0.14 32476 0 0.0 0.06 3217.41 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
9-3 2451 0/56/291730 W 0.23 42381 0 0.0 0.32 3113.19 68.118.8.157 zachdotsey.com GET /wordpress/index.php HTTP/1.1
10-3 31211 0/59/280899 W 6.04 44051 0 0.0 0.77 3128.00 72.52.238.128 zachdotsey.com POST /wordpress/wp-cron.php?doing_wp_cron HTTP/1.0
11-3 3823 0/4/277229 W 0.17 41746 0 0.0 0.04 3014.66 68.118.8.157 zachdotsey.com GET /wordpress/index.php HTTP/1.1
12-3 4473 0/9/277074 W 0.08 38453 0 0.0 0.00 3313.94 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
13-3 4242 1/14/272166 W 0.10 41659 0 0.5 0.05 2977.05 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
14-3 2323 0/234/269513 W 0.84 42136 0 0.0 1.02 2946.48 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
15-3 32051 0/6/257740 W 0.08 43872 0 0.0 0.58 2866.34 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
16-3 16986 0/271/259463 W 18.13 16761 0 0.0 4.12 2896.05 74.6.18.233 zachdotsey.com GET /wordpress/tag/xbox/ HTTP/1.0
17-3 2297 1/8/252501 W 0.54 42502 0 0.5 0.18 2797.73 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
18-3 9476 1/145/247116 W 0.61 40095 0 0.4 1.53 2703.11 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
19-3 2494 0/214/244830 W 3.16 42017 0 0.0 2.40 2618.41 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
20-3 5526 0/118/238426 W 3.50 37656 0 0.0 1.73 2544.06 68.10.212.178 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
21-3 31901 0/28/228757 W 0.14 43992 0 0.0 0.04 2522.36 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
22-3 12398 0/25/216141 W 0.40 39998 0 0.0 4.72 2398.82 38.117.108.131 zachdotsey.com GET /wordpress/ HTTP/1.1
23-3 2300 0/187/222141 W 0.68 42315 0 0.0 0.67 2503.15 65.184.161.115 zachdotsey.com GET /wordpress/ HTTP/1.1
24-3 31969 0/25/211848 W 0.26 43810 0 0.0 0.38 2326.01 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
25-3 31582 0/25/198495 W 0.17 69010 0 0.0 0.25 2139.13 70.63.195.121 myvenue.venuecom.com POST /fastmail/ HTTP/1.1
26-3 28115 1/1/197089 W 0.04 40155 0 0.4 0.00 2126.75 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
27-3 12988 1/42/186898 W 0.55 35055 0 2.1 0.36 2037.54 71.193.156.250 zachdotsey.com GET /wordpress/ HTTP/1.1
28-3 3780 1/26/181659 W 0.34 41662 0 0.5 0.05 1918.00 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
29-3 1002 0/22/169331 W 0.18 39885 0 0.0 0.03 1888.59 64.40.121.190 zachdotsey.com GET /robots.txt HTTP/1.0
30-3 4493 0/6/163101 W 0.06 41465 0 0.0 0.18 1732.58 209.131.41.49 zachdotsey.com GET /wordpress/feed/ HTTP/1.0
31-3 32458 0/1/162852 W 0.04 43750 0 0.0 0.01 1758.80 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
32-3 14198 0/571/157504 W 47.36 32680 0 0.0 8.64 1733.04 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
33-3 2213 0/9/152830 W 0.32 42624 0 0.0 0.00 1782.36 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
34-3 2308 0/1/137395 W 0.06 39398 0 0.0 0.00 1433.25 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
35-3 6984 0/123/127498 W 1.88 40241 0 0.0 0.18 1350.38 206.196.125.113 zachdotsey.com GET /wordpress/?feed=rss2 HTTP/1.1
36-3 1003 0/21/116316 W 0.81 39874 0 0.0 1.15 1216.35 67.202.60.246 zachdotsey.com GET /wordpress/ HTTP/1.1
37-3 3025 0/19/106816 W 0.16 42196 0 0.0 0.28 1096.76 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
38-3 4250 1/15/101047 W 0.09 41660 0 0.5 0.01 1198.01 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
39-3 3073 0/73/91871 W 2.32 41891 0 0.0 1.81 924.03 68.118.8.157 zachdotsey.com GET /wordpress/index.php HTTP/1.1
40-3 2133 0/15/86368 W 0.20 39445 0 0.0 0.09 888.41 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
41-3 2803 0/93/79858 W 0.67 39020 0 0.0 0.69 877.38 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
42-3 3030 0/165/72532 W 35.08 41532 0 0.0 2.17 777.91 65.184.161.115 zachdotsey.com GET /wordpress/?feed=rss2 HTTP/1.1
43-3 13566 0/427/68292 W 14.81 33263 0 0.0 6.28 682.48 174.129.193.94 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
44-3 31951 0/6/65523 W 0.39 43980 0 0.0 0.15 624.37 78.31.110.126 zachdotsey.com GET /wordpress/feed HTTP/1.1
45-3 17775 0/4/64507 W 0.11 32768 0 0.0 0.00 666.08 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
46-3 17485 0/280/61533 W 30.17 16250 0 0.0 6.34 655.87 77.88.42.26 zachdotsey.com GET /robots.txt HTTP/1.1
47-3 1379 0/305/51058 W 2.50 42256 0 0.0 5.02 691.25 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
48-3 15264 0/28/49621 W 0.11 33958 0 0.0 0.02 527.41 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
49-3 20544 1/28/48765 W 1.55 40125 0 0.4 0.17 516.42 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
50-3 14318 0/408/50772 W 26.77 32722 0 0.0 7.28 509.18 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
51-3 2258 0/18/45699 W 0.08 39388 0 0.0 0.01 456.81 64.40.121.190 zachdotsey.com GET /robots.txt HTTP/1.0
52-3 3039 0/21/37675 W 0.38 42077 0 0.0 1.58 442.82 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
53-3 2747 0/3/35053 W 0.06 39268 0 0.0 0.22 371.79 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
54-3 17408 0/22/35784 W 0.26 32871 0 0.0 0.42 367.04 74.6.18.233 zachdotsey.com GET /robots.txt HTTP/1.0
55-3 4511 0/6/29200 W 0.40 41444 0 0.0 0.23 375.89 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
56-3 5534 0/54/27466 W 2.63 37695 0 0.0 0.38 305.27 68.10.212.178 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
57-3 23760 0/41/20806 W 0.23 40553 0 0.0 0.33 219.16 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
58-3 5638 0/247/17586 W 2.79 40174 0 0.0 2.66 182.34 64.237.119.18 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
59-3 31783 0/5/18112 W 0.05 40067 0 0.0 0.06 182.11 65.113.57.7 zachdotsey.com GET /wordpress/feed/ HTTP/1.0
60-3 2319 0/1/13920 W 0.03 39391 0 0.0 0.00 145.61 38.117.108.131 zachdotsey.com GET /wordpress/ HTTP/1.1
61-3 23730 0/155/12935 W 29.86 28181 0 0.0 3.25 153.35 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
62-3 12586 0/25/12506 W 0.14 40271 0 0.0 0.09 135.23 72.233.56.156 zachdotsey.com GET /wordpress/ HTTP/1.1
63-3 13567 0/15/10439 W 0.54 34975 0 0.0 0.10 137.24 84.217.7.221 zachdotsey.com GET /wordpress/2009/06/06/emergency-baby-call-tests/ HTTP/1.1
64-3 17776 1/161/10534 W 1.65 31758 0 0.4 2.14 128.33 208.92.218.250 zachdotsey.com GET /wordpress/ HTTP/1.1
65-3 3053 0/159/7939 W 7.25 41485 0 0.0 2.64 74.76 209.131.41.48 zachdotsey.com GET /robots.txt HTTP/1.0
66-3 5056 0/115/6934 W 1.56 37848 0 0.0 2.43 81.76 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
67-3 16535 0/160/6199 W 19.57 39641 0 0.0 2.57 67.22 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
68-3 17777 0/37/7722 W 0.24 32569 0 0.0 0.15 93.77 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
69-3 2355 0/2/5737 W 0.15 39346 0 0.0 0.03 73.54 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
70-3 10432 0/24/5080 W 0.33 36392 0 0.0 0.47 45.89 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
71-3 10433 0/12/4099 W 0.93 36365 0 0.0 0.65 41.80 68.7.141.144 zachdotsey.com GET /wordpress/2006/12/18/the-plastic-coating-on-the-end-of-a-s
72-3 6145 0/114/4835 W 12.61 37285 0 0.0 1.49 57.55 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
73-3 5539 0/71/4717 W 5.37 37680 0 0.0 1.63 62.39 68.10.212.178 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
74-3 17690 0/38/5004 W 0.12 32810 0 0.0 0.25 46.34 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
75-3 1528 0/38/3991 W 0.14 39764 0 0.0 0.08 41.91 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
76-3 2751 0/26/2886 W 0.22 39144 0 0.0 0.63 25.56 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
77-3 5453 0/95/6939 W 1.95 21796 0 0.0 1.09 87.49 69.147.79.37 zachdotsey.com GET /robots.txt HTTP/1.0
78-3 5061 0/192/3238 W 9.87 37110 0 0.0 2.13 39.70 78.31.110.126 zachdotsey.com GET /wordpress/feed HTTP/1.1
79-3 9955 0/143/4659 W 11.55 35985 0 0.0 7.35 64.53 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
80-3 17779 0/29/4181 W 0.33 32548 0 0.0 0.47 48.11 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
81-3 1192 0/74/2861 W 0.54 39651 0 0.0 0.42 27.09 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
82-3 13108 0/42/4116 W 0.13 35144 0 0.0 0.10 37.39 71.193.156.250 zachdotsey.com GET /wordpress/wp-login.php?loggedout=true HTTP/1.1
83-3 32180 0/0/6535 W 0.98 10753 0 0.0 0.00 105.04 142.166.3.122 zachdotsey.com GET /robots.txt HTTP/1.1
84-3 24479 0/148/4080 W 98.02 28139 0 0.0 3.46 60.62 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
85-3 776 1/204/8349 W 40.83 9214 0 0.4 3.57 99.11 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
86-3 13569 0/25/3218 W 10.53 34863 0 0.0 0.29 28.96 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
87-3 13110 0/2/2535 W 0.09 35187 0 0.0 0.00 26.16 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
88-3 4716 0/157/2237 W 3.75 37444 0 0.0 3.58 25.28 206.196.125.113 zachdotsey.com GET /wordpress/?feed=rss2 HTTP/1.1
89-3 19878 0/110/2928 W 10.39 31357 0 0.0 0.54 26.66 58.61.164.39 zachdotsey.com GET /robots.txt HTTP/1.1
90-3 2003 0/28/1847 W 1.81 39519 0 0.0 0.39 19.10 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
91-3 13570 0/0/1928 W 10.59 35116 0 0.0 0.00 23.59 71.193.156.250 zachdotsey.com GET /wordpress/ HTTP/1.1
92-3 16358 0/282/1910 W 33.11 32280 0 0.0 5.57 26.53 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
93-3 16367 0/50/1664 W 10.03 33243 0 0.0 0.88 17.62 174.129.193.94 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
94-3 25642 0/82/2391 W 19.24 28268 0 0.0 2.07 34.95 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
95-3 24480 0/261/2711 W 31.22 27528 0 0.0 3.14 43.29 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
96-3 17692 0/514/1024 W 46.55 30965 0 0.0 6.50 14.37 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
97-3 10442 0/126/1041 W 1.25 35891 0 0.0 1.20 8.47 203.171.91.144 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
98-3 25643 0/103/1705 W 0.67 28008 0 0.0 2.83 20.89 74.6.18.233 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
99-3 22619 0/338/1657 W 27.38 28329 0 0.0 4.00 27.55 72.30.161.222 zachdotsey.com GET /robots.txt HTTP/1.0
100-3 19714 0/0/1845 W 12.66 31778 0 0.0 0.00 22.14 208.92.218.250 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
101-3 19367 1/155/1983 W 10.76 31728 0 0.4 0.15 23.66 208.92.218.250 zachdotsey.com GET /wordpress/ HTTP/1.1
102-3 26652 0/122/1187 W 41.42 26872 0 0.0 3.00 14.95 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
103-3 7280 3/361/1639 W 12.44 35165 0 8.9 4.80 17.06 71.193.156.250 zachdotsey.com GET /wordpress/ HTTP/1.1
104-3 20843 0/507/949 W 99.96 28160 0 0.0 7.70 11.64 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
105-3 20844 0/308/1868 W 23.03 30024 0 0.0 3.00 28.11 78.31.110.126 zachdotsey.com GET /wordpress/feed HTTP/1.1
106-3 17791 1/278/1026 W 26.89 31698 0 0.4 4.18 13.29 208.92.218.250 zachdotsey.com GET /wordpress/ HTTP/1.1
107-3 17792 0/304/642 W 12.27 31388 0 0.0 2.72 8.79 58.61.164.39 zachdotsey.com GET /robots.txt HTTP/1.1
108-3 17697 0/57/515 W 0.30 32611 0 0.0 1.78 8.41 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
109-3 19715 0/611/783 W 60.52 29153 0 0.0 5.94 7.20 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
110-3 13952 0/345/614 W 5.95 33656 0 0.0 3.47 8.18 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
111-3 32009 0/75/1959 W 5.25 24778 0 0.0 1.06 22.60 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
112-3 17793 0/35/178 W 11.11 32590 0 0.0 0.44 1.92 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
113-3 19533 0/8/2004 W 0.16 16705 0 0.0 1.32 34.66 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
114-3 22622 0/304/925 W 181.63 28201 0 0.0 5.05 12.30 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
115-3 26656 0/38/763 W 0.55 27724 0 0.0 0.40 6.22 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
116-3 31804 0/57/3039 W 2.17 10748 0 0.0 1.27 44.70 142.166.3.122 zachdotsey.com GET /wordpress/2009/07/13/millys-first-time-in-a-restaurant/ HT
117-3 26658 0/0/866 W 14.05 28069 0 0.0 0.00 11.50 74.6.18.233 zachdotsey.com GET /robots.txt HTTP/1.0
118-3 26659 0/46/646 W 4.59 27608 0 0.0 0.47 4.90 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
119-3 5457 0/86/998 W 21.35 21916 0 0.0 1.59 14.79 69.147.79.37 zachdotsey.com GET /robots.txt HTTP/1.0
120-3 9855 0/486/1470 W 58.03 18535 0 0.0 8.31 25.07 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
121-3 17802 0/8/206 W 0.05 32743 0 0.0 0.00 1.67 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
122-3 17803 0/10/141 W 0.19 32701 0 0.0 0.00 1.08 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
123-3 19888 0/69/120 W 0.37 31389 0 0.0 0.97 1.10 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
124-3 25184 0/160/689 W 33.97 27701 0 0.0 5.24 9.16 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
125-3 27208 0/615/2460 W 28.73 10736 0 0.0 7.88 44.54 142.166.3.122 zachdotsey.com GET /wordpress/2009/07/14/millys-smile/ HTTP/1.1
126-3 21945 0/281/410 W 4.56 29359 0 0.0 3.82 7.16 74.6.18.233 zachdotsey.com GET /robots.txt HTTP/1.0
127-3 25187 0/392/429 W 58.81 25928 0 0.0 7.26 7.47 75.219.249.154 zachdotsey.com GET /wordpress/ HTTP/1.1
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202-3 30984 0/0/2581 W 42.72 40 0 0.0 0.00 31.17 207.210.148.62 marketplace-mail.com GET /checklist.php HTTP/1.1
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204-3 29989 0/26/2777 W 30.30 78 0 0.0 1.51 38.95 198.178.147.1 raleighwoodmovies.com GET / HTTP/1.1
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Depois de você dizer quais módulos você tinha, eu notei que você disse EAccelerator, que tem um bug (bug tracker link aqui ) que faz com que o Apache bloqueie em loop infinito e traga o servidor para perto, tente desabilitá-lo e veja o que acontece.
Você vê muitas solicitações de POST /wordpress/wp-admin/admin-ajax.php nos horários problemáticos? Se sim, então pode ser causado por um spammer que passa tentando forçar algo, por uma tentativa deliberada de DoS, ou simplesmente porque o site está sendo postado em algum lugar ocupado de vez em quando (seus logs mostram muitas solicitações vindas do mesmo? referenciador de site?).
Também pode ser um problema de bloqueio de banco de dados, ou seja, uma solicitação solicitou que uma operação longa fosse executada com bloqueios completos de negação de leitura até terminada em uma tabela acessada com freqüência e as outras solicitações estão apenas aguardando o bloqueio ser liberado (o que pode acontecer naturalmente, ou como resultado de você ter matado o Apache e, portanto, a conexão que está segurando o (s) bloqueio (s). Se o site estiver ocupado o suficiente, isso pode criar uma carga significativa à medida que muitos processos do Apache são criados Sente-se consumindo memória até que eles possam continuar após o bloqueio - se sua configuração do Apache for tal que um número relativamente ilimitado de processos-filhos possa ser criado, então o sistema poderia facilmente iniciar a troca de thrashing neste ponto.
Para ver se a carga está sendo causada pelo uso da CPU, IO devido ao acesso ao banco de dados e tal, ou IO devido à troca de troca, você precisará investigar a saída do htop (ou simplesmente superior), livre e os outros utilitários usuais de monitoramento de carga do sistema. Isso pode fornecer mais pistas sobre onde a raiz do problema pode ser encontrada.
Isso definitivamente parece um ataque DoS lento em um dos sites que você hospeda.
Encontre mais detalhes, bem como as soluções Debian e Red-Hat aqui
Um dos outros sintomas desse tipo de ataque será o aparecimento de dezenas / centenas de 400 erros nos seus logs do Apache (se / depois do ataque terminar - leia mais em ha.ckers.org/slowloris/)
Você pode tentar definir o valor de TimeOut no apache para algo bem draconiano como 20 segundos. Isso deve concluir a conexão se determinadas ações demorarem mais tempo para serem concluídas. Isso é uma espécie de papering sobre o problema, ao invés de resolvê-lo. Ele provavelmente deve ser usado para depurar se o problema for devido a algo que está demorando demais, e não como uma solução final.
Seus scripts PHP estão fazendo alguma solicitação de banco de dados? Em caso afirmativo, verifique se o banco de dados está respondendo em tempo hábil.
David cobre a maior parte dos itens essenciais em seu resposta .
Além disso, semelhante ao problema de bloqueio do banco de dados, pode haver uma chamada no back-end para um recurso externo que não está respondendo ou respondendo lentamente. Por exemplo, se você tivesse um CGI que fizesse um LWP para example.net, o Apache esperaria até o tempo limite ou a resposta. Isso também pode causar um esgotamento de recursos.
Com que frequência você entra na caixa? Eu tive um problema, por mais estranho que pareça, que o ssh realmente mataria o serviço do apache. Eu iria ssh em e tudo seria apenas trancar. Eu não vpn'ed na caixa há meses e não houve nenhum problema em tudo. Isso não aconteceu toda vez. Mas eu sei que havia uma correlação.
Ao lidar com qualquer problema de desempenho, você precisa conhecer a entrada. Configure seu comutador para espelhar a porta do servidor da Web para um servidor sniffer no qual você registre todo o tráfego HTTP. Tente correlacionar o tráfego com o problema e tente reproduzir o problema em uma máquina de teste.
O próximo passo é ver o que está acontecendo com esses processos. Use strace e veja em qual sistema de chamada eles estão aguardando. Use lsof para descobrir os descritores de arquivos envolvidos no strace. ls -l /proc/<PID>/fd é útil também.
Como chronos disse, pode ser um ataque lento.
Tags php apache-2.2 intermittent