Kami baru-baru ini telah mencapai maxclients (300) kami di server kami dan memperhatikan banyak koneksi yang macet dalam keadaan membaca R. Berikut kutipan dari dump status server kami:
Current Time: Monday, 29-Apr-2013 11:46:00 PDT
Restart Time: Monday, 29-Apr-2013 11:03:48 PDT
Parent Server Generation: 0
Server uptime: 42 minutes 12 seconds
Total accesses: 144170 - Total Traffic: 29.8 MB
CPU Usage: u188.25 s345.65 cu2601.11 cs0 - 124% CPU load
56.9 requests/sec - 12.0 kB/second - 216 B/request
244 requests currently being processed, 56 idle workers
KRR_RRRRRRRRRRRR_RRRKRRRR.......................................
K_RRK_RK_RKR_RRR_RRRR_R_R.......................................
RRRRRRRRRRRRRC_CR___RCRR_.......................................
R_RRRCRRRRRRRRCRRRCRRKRCR.......................................
R_K_RKR_CRRRRRRKC_RR_KR_R.......................................
RRRRKRR__RRRRKRRCR_RRRRRR.......................................
_RCRRRRRRRRRKR__RR_RRCRRR.......................................
RRRRRRRRCRRRRRRKRRRR_RCRR.......................................
R___RRCR__RR__RRRKC___RK_.......................................
_R_KCR__RR__R_R_RRRRRR_RK.......................................
RRR_RR___RCRRK_R_RWRR_RRC.......................................
RRKRCRRRRRRRRKRRRRRRRRCRR.......................................
................................................................
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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
0-0 10320 1/718/718 K 399.14 0 42 0.0 0.21 0.21 69.171.178.24 mysite.com GET /home.php
0-0 10320 0/434/434 R 398.21 8 40 0.0 0.07 0.07 ? ? ..reading..
0-0 10320 0/548/548 R 331.52 558 45 0.0 0.12 0.12 ? ? ..reading..
0-0 10320 0/460/460 _ 399.05 0 42 0.0 0.08 0.08 98.129.101.123 mysite.com GET /home.php
0-0 10320 0/473/473 R 364.89 301 48 0.0 0.09 0.09 ? ? ..reading..
0-0 10320 0/616/616 R 396.18 26 46 0.0 0.11 0.11 ? ? ..reading..
0-0 10320 0/494/494 R 378.84 127 48 0.0 0.10 0.10 ? ? ..reading..
0-0 10320 0/231/231 R 311.62 687 43 0.0 0.04 0.04 ? ? ..reading..
0-0 10320 0/376/376 R 391.17 76 53 0.0 0.08 0.08 ? ? ..reading..
0-0 10320 0/377/377 R 380.72 176 53 0.0 0.07 0.07 ? ? ..reading..
0-0 10320 0/589/589 R 355.07 382 47 0.0 0.10 0.10 ? ? ..reading..
0-0 10320 0/587/587 R 393.16 56 50 0.0 0.13 0.13 ? ? ..reading..
0-0 10320 0/561/561 R 393.89 49 40 0.0 0.10 0.10 ? ? ..reading..
0-0 10320 0/616/616 R 389.88 81 41 0.0 0.22 0.22 ? ? ..reading..
0-0 10320 0/354/354 R 392.12 59 42 0.0 0.06 0.06 ? ? ..reading..
0-0 10320 0/346/346 R 377.51 192 44 0.0 0.06 0.06 ? ? ..reading..
Mengapa ada begitu banyak dalam kondisi R itu? Dan apakah kolom SS benar-benar berarti bahwa mereka telah membaca selama 558, 301, dll detik?
Berikut beberapa info dan pengaturan server saya:
Server version: Apache/2.2.24 (Unix)
Server built: Mar 22 2013 10:57:57
Cpanel::Easy::Apache v3.18.9 rev9999
Server's Module Magic Number: 20051115:31 Server loaded: APR 1.4.6, APR-Util 1.4.1 Compiled using: APR 1.4.6, APR-Util 1.4.1
Architecture: 64-bit
Server MPM: Worker
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with....
-D APACHE_MPM_DIR="server/mpm/worker"
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) -D APR_USE_SYSVSEM_SERIALIZE -D APR_USE_PTHREAD_SERIALIZE -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT -D APR_HAS_OTHER_CHILD -D AP_HAVE_RELIABLE_PIPED_LOGS -D DYNAMIC_MODULE_LIMIT=128 -D HTTPD_ROOT="/usr/local/apache"
-D SUEXEC_BIN="/usr/local/apache/bin/suexec"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
StartServers 5
<IfModule prefork.c>
MinSpareServers 5
MaxSpareServers 10
</IfModule>
ServerLimit 300
MaxClients 300
MaxRequestsPerChild 10000
KeepAlive On
KeepAliveTimeout 1
MaxKeepAliveRequests 100
Here are compiled in modules:
core.c
mod_authn_file.c
mod_authn_dbm.c
mod_authn_dbd.c
mod_authn_default.c
mod_authn_alias.c
mod_authz_host.c
mod_authz_groupfile.c
mod_authz_user.c
mod_authz_dbm.c
mod_authz_default.c
mod_auth_basic.c
mod_auth_digest.c
mod_file_cache.c
mod_cache.c
mod_disk_cache.c
mod_include.c
mod_filter.c
mod_deflate.c
mod_log_config.c
mod_log_forensic.c
mod_logio.c
mod_env.c
mod_mime_magic.c
mod_expires.c
mod_headers.c
mod_unique_id.c
mod_setenvif.c
mod_version.c
mod_proxy.c
mod_proxy_connect.c
mod_proxy_ftp.c
mod_proxy_http.c
mod_proxy_scgi.c
mod_proxy_ajp.c
mod_proxy_balancer.c
mod_ssl.c
worker.c
http_core.c
mod_mime.c
mod_dav.c
mod_status.c
mod_autoindex.c
mod_asis.c
mod_info.c
mod_suexec.c
mod_cgid.c
mod_dav_fs.c
mod_dav_lock.c
mod_negotiation.c
mod_dir.c
mod_actions.c
mod_speling.c
mod_userdir.c
mod_alias.c
mod_rewrite.c
mod_so.c
Ketika kami memulai kembali permintaan membaca perlahan mulai membangun kembali setiap kali. Terima kasih atas bantuan Anda sebelumnya!
UPDATE: inilah netstat -pn:
tcp 0 0 198.57.162.52:80 54.235.31.205:41209 TIME_WAIT -
tcp 0 0 198.57.162.52:80 166.147.121.170:63246 TIME_WAIT -
tcp 0 0 198.57.162.52:80 50.128.171.238:50751 FIN_WAIT2 -
tcp 0 0 198.57.162.52:80 89.241.135.84:24825 TIME_WAIT -
tcp 0 0 198.57.162.52:80 205.142.167.225:33256 TIME_WAIT -
tcp 0 0 198.57.162.52:80 76.127.87.244:56493 TIME_WAIT -
tcp 0 0 198.57.162.52:80 205.153.156.222:21571 TIME_WAIT -
tcp 0 0 198.57.162.52:80 108.12.147.14:61135 TIME_WAIT -
tcp 0 0 198.57.162.52:80 166.217.157.32:1630 TIME_WAIT -
tcp 0 0 198.57.162.52:443 71.22.102.71:4252 TIME_WAIT -
Contoh output lsof:
httpd 4092 nobody 25u IPv4 711278095 0t0 TCP 198-57-162-52.unifiedlayer.com:http->4.sub-70-193-66.myvzw.com:12471 (ESTABLISHED)
httpd 4092 nobody 26u IPv4 711350284 0t0 TCP 198-57-162-52.unifiedlayer.com:http->c75-111-15-253.amrlcmta01.tx.dh.suddenlink.net:51298 (ESTABLISHED)
httpd 4092 nobody 27u IPv4 711400163 0t0 TCP 198-57-162-52.unifiedlayer.com:http->108-235-145-129.lightspeed.irvnca.sbcglobal.net:56037 (FIN_WAIT2)
httpd 4092 nobody 28u IPv4 711390092 0t0 TCP 198-57-162-52.unifiedlayer.com:http->c-98-239-167-37.hsd1.pa.comcast.net:57988 (ESTABLISHED)
httpd 4092 nobody 29u IPv4 711206563 0t0 TCP 198-57-162-52.unifiedlayer.com:http->252.sub-70-199-129.myvzw.com:6179 (ESTABLISHED)
httpd 4092 nobody 30u IPv4 711271036 0t0 TCP 198-57-162-52.unifiedlayer.com:https->5.71.20.78:62114 (ESTABLISHED)
httpd 4092 nobody 31u IPv4 711385050 0t0 TCP 198-57-162-52.unifiedlayer.com:http->64.128.135.115:17547 (ESTABLISHED)
httpd 4092 nobody 32u IPv4 711400374 0t0 TCP 198-57-162-52.unifiedlayer.com:https->mbb5336d0.tmodns.net:36277 (ESTABLISHED)
httpd 4092 nobody 33u IPv4 711378965 0t0 TCP 198-57-162-52.unifiedlayer.com:http->us-chi-exchange.brightstarcorp.com:47707 (ESTABLISHED)
httpd 4092 nobody 34u IPv4 711394997 0t0 TCP 198-57-162-52.unifiedlayer.com:https->209-152-137-170.dsl.mcmo.net:64370 (ESTABLISHED)
httpd 4092 nobody 35u IPv4 711391122 0t0 TCP 198-57-162-52.unifiedlayer.com:http->c-76-125-136-230.hsd1.oh.comcast.net:57093 (ESTABLISHED)
httpd 4092 nobody 36u IPv4 711398994 0t0 TCP 198-57-162-52.unifiedlayer.com:http->lookup.eatright.org:60021 (ESTABLISHED)
httpd 4092 nobody 37u IPv4 711400972 0t0 TCP 198-57-162-52.unifiedlayer.com:http->modemcable126.224-130-66.mc.videotron.ca:55970 (ESTABLISHED)
httpd 4092 nobody 38u IPv4 711379727 0t0 TCP 198-57-162-52.unifiedlayer.com:http->c-75-65-146-83.hsd1.ms.comcast.net:50309 (ESTABLISHED)
httpd 4092 nobody 39u IPv4 711390427 0t0 TCP 198-57-162-52.unifiedlayer.com:https->66-87-130-177.pools.spcsdns.net:41127 (ESTABLISHED)
httpd 4092 nobody 40u IPv4 711401179 0t0 TCP 198-57-162-52.unifiedlayer.com:http->8.225.196.132:20608 (ESTABLISHED)
httpd 4092 nobody 41u IPv4 711142701 0t0 TCP 198-57-162-52.unifiedlayer.com:http->c-24-15-33-77.hsd1.il.comcast.net:54631 (ESTABLISHED)
apache-2.2
Shane N
sumber
sumber
Jawaban:
@ ShaneN Server Anda mencapai titik kekurangan sumber daya. Mungkin Anda mendapatkan tanpa rentang port sesaat, atau tanpa sistem file-deskriptor, yang membatasi jumlah soket server Anda dapat digunakan untuk menjawab permintaan. Permintaan status baca berarti soket dibuka, tetapi baris permintaan tidak pernah mencapai server, ini adalah bentuk DoS yang dikenal yang disebut SlowLoris. Untuk mengurangi DoS semacam ini, pertama-tama saya akan:
Tambahkan ke
/etc/sysctl.conf, entri berikut:net.ipv4.tcp_fin_timeout = 10yang menetapkan batas waktuFINsoket hingga 10 detik.net.ipv4.ip_local_port_range = "15000 61000"yang menetapkan kisaran port sementara menjadi sekitar 46.000 kemungkinan port terbuka per IP.net.core.somaxconn = 1024- default 128 -net.core.somaxconnNilai memiliki peran penting. Ini membatasi jumlah maksimum permintaan yang diantrekan ke soket pendengaran.net.core.netdev_max_backlog = 2000- default 1000 - yang meningkatkan antrian TCP dari permintaan yang masuk.Setelah menambahkan baris-baris itu ke file, terbitkan
sysctl -puntuk memuat parameter kernel pada runtime saat ini dan periksa jam sibuk Anda untuk melihat apakah masalah Anda masih ada.sumber
Ini mungkin serangan denial-of-service yang dimaksudkan untuk menempati soket mendengarkan dan mengikat server Anda. Jika Anda dapat menentukan hal itu, saya sarankan mencoba proxy frontend seperti nginx untuk menghilangkan tekanan dari Apache. Proxy seperti ini dapat menangani sejumlah besar koneksi dan setidaknya akan memberi Anda ruang bernapas untuk mencari tahu apa yang terjadi.
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