Wysoki Load Average na serwerze dedykowanym

Pawel32 · Kwiecień 28, 2019

Witam,

Posiadam od roku serwer dedykowany na którym mam postawiony Apache + MySQL + Direct Admin. Na serwerze obecnie mam 142 blogi Wordpress, do ok 2 tygodni temu load wynosił 3-4%, obecnie jest to od 35% do momentami nawet i 255%. Co prawda na serwerze postawionych jest 140 blogów wordpress, ale jest na nich bardzo mały ruch, czasami kilkaset osób w ciągu dnia i tyle. Według logów z 32GB RAM używane jest nie całe 10GB.

Parametry serwera:

Procesor: Intel Xeon E3-1270v6 - 4/8t - 3.8GHz /4.2GHz
RAM: 32GB DDR4 ECC 2133 MHz

Wynik polecenia httpd -V

Server version: Apache/2.4.37 (Unix)
Server built:   Nov  1 2018 14:48:36
Server's Module Magic Number: 20120211:83
Server loaded:  APR 1.6.5, APR-UTIL 1.6.1
Compiled using: APR 1.6.5, APR-UTIL 1.6.1
Architecture:   64-bit
Server MPM:     prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -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=256
 -D HTTPD_ROOT="/etc/httpd"
 -D HAVE_SYSTEMD
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="/var/logs/httpd.pid"
 -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"

Myślę, że screen wszystko wyjaśni:

Obecnie wygląda to tak:

Serwer został zakupiony rok temu i od razu w pakiecie był zainstalowany direct admin, więc nic nie było sensownie optymalizowane, ale patrząc na obecną sytuację bardzo by się przydało, bo są momenty, że strony chodzą bardzo szybki i jest dużo takich momentów, gdzie strona w ogóle się nie wczytuje, chociaż na serwerze nie ma obciążenia. Jakiś pomysł co zrobić, żeby LA spadł dużo niżej, i żeby serwer szybko chodził? Mój /etc/httpd/conf/extra/httpd-mpm.conf

#
# Server-Pool Management (MPM specific)
#

#
# PidFile: The file in which the server should record its process
# identification number when it starts.
#
# Note that this is the default PidFile for most MPMs.
#
<IfModule !mpm_netware_module>
    PidFile "/var/run/httpd.pid"
</IfModule>

#
# Only one of the below sections will be relevant on your
# installed httpd.  Use "apachectl -l" to find out the
# active mpm.
#

#
# Only one of the below sections will be relevant on your
# installed httpd.  Use "apachectl -l" to find out the
# active mpm.
#

# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# MaxRequestWorkers: maximum number of server processes allowed to start
# MaxConnectionsPerChild: maximum number of connections a server process serves
#                         before terminating
<IfModule mpm_prefork_module>
    StartServers          4
    MinSpareServers       3
    MaxSpareServers      10
    ServerLimit         256
    MaxRequestWorkers  256
    MaxConnectionsPerChild   20000
</IfModule>
# worker MPM
# StartServers: initial number of server processes to start
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestWorkers: maximum number of worker threads
# MaxConnectionsPerChild: maximum number of connections a server process serves
#                         before terminating
<IfModule mpm_worker_module>
    StartServers             3
    MinSpareThreads         2
    MaxSpareThreads        3
    ThreadsPerChild         50
    MaxRequestWorkers     100
    MaxConnectionsPerChild   20000
</IfModule>

# event MPM
# StartServers: initial number of server processes to start
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestWorkers: maximum number of worker threads
# MaxConnectionsPerChild: maximum number of connections a server process serves
#                         before terminating
<IfModule mpm_event_module>
    StartServers             3
    MinSpareThreads         32
    MaxSpareThreads        638
    ThreadsPerChild         64
    ServerLimit             32
    MaxRequestWorkers     1024
    MaxConnectionsPerChild   15000
</IfModule>
# NetWare MPM
# ThreadStackSize: Stack size allocated for each worker thread
# StartThreads: Number of worker threads launched at server startup
# MinSpareThreads: Minimum number of idle threads, to handle request spikes
# MaxSpareThreads: Maximum number of idle threads
# MaxThreads: Maximum number of worker threads alive at the same time
# MaxConnectionsPerChild: Maximum  number of connections a thread serves. It
#                         is recommended that the default value of 0 be set
#                         for this directive on NetWare.  This will allow the
#                         thread to continue to service requests indefinitely.
<IfModule mpm_netware_module>
    ThreadStackSize      65536
    StartThreads           250
    MinSpareThreads         25
    MaxSpareThreads        50
    MaxThreads            1000
    MaxConnectionsPerChild   0
</IfModule>

# OS/2 MPM
# StartServers: Number of server processes to maintain
# MinSpareThreads: Minimum number of idle threads per process,
#                  to handle request spikes
# MaxSpareThreads: Maximum number of idle threads per process
# MaxConnectionsPerChild: Maximum number of connections per server process
<IfModule mpm_mpmt_os2_module>
    StartServers             2
    MinSpareThreads          5
    MaxSpareThreads         10
    MaxConnectionsPerChild   0
</IfModule>

# WinNT MPM
# ThreadsPerChild: constant number of worker threads in the server process
# MaxConnectionsPerChild: maximum number of connections a server process serves
<IfModule mpm_winnt_module>
    ThreadsPerChild        150
    MaxConnectionsPerChild   0
</IfModule>
# The maximum number of free Kbytes that every allocator is allowed
# to hold without calling free(). In threaded MPMs, every thread has its own
# allocator. When not set, or when set to zero, the threshold will be set to
# unlimited.
<IfModule !mpm_netware_module>
    MaxMemFree            2048
</IfModule>
<IfModule mpm_netware_module>
    MaxMemFree             100
</IfModule>

Edytowano Kwiecień 28, 2019 przez Pawel32 (zobacz historię edycji)

Rolej · Kwiecień 28, 2019

Sprawdź, czy w któregoś z Wordpressów jakiś bot nie wali na plik xmlrpc.php lub wp-login.php - często to powód wzrostu loadu.

Pawel32 · Kwiecień 28, 2019

W takim wypadku te logi by wiele tłumaczyły

> ::1 - - [21/Apr/2019:12:40:19 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1
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> [21/Apr/2019:12:35:01 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:34:59 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
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> [21/Apr/2019:12:34:45 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
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> [21/Apr/2019:12:34:43 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
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> [21/Apr/2019:12:33:56 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
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> [21/Apr/2019:12:33:45 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:44 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:43 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:42 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:41 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:39 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:38 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:37 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:36 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:35 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:31 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:30 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
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> [21/Apr/2019:12:33:28 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:25 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:18 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:12 +0200] "OPTIONS * HTTP/1.0" 200 138 ::1 - -
> [21/Apr/2019:12:33:08 +0200] "OPTIONS * HTTP/1.0" 200 138

To jest tylko mały wycinek. Wcześniej serwer potrafił przy 142 blogach chodzić nawet na poziomie 0.8%, teraz bez szans

Rolej · Kwiecień 28, 2019

Coś Ci wali po localhoście. Sprawdź tę konkretną witrynę.

Pawel32 · Kwiecień 28, 2019

Problem w tym, że tak mam na każdej domenie. W access_log mam własnie tylko takie linijki jak wkleiłem

Edytowano Kwiecień 28, 2019 przez Pawel32 (zobacz historię edycji)

Rolej · Kwiecień 28, 2019

https://serverfault.com/questions/543355/options-http-1-0-in-access-log

Sprawdź to.

Pawel32 · Kwiecień 28, 2019

To by pasowało, tylko pytanie co zrobić, żeby to tak nie zamulało serwera cały czas, bo jednak obciązenie z 0.8% na nawet 254% coś musiało wywołać.

Pawel32 · Kwiecień 28, 2019

Znalazłem przyczynę, dzisiaj dla kilku domen było od 40-80k zapytań na xml-rpc oraz wp-login. Wyłączyłem wszędzie xml-rpc oraz zmieniłem domyślny adres logowania + po 3 próbach logowania blokada

Rolej · Kwiecień 28, 2019

Spróbuj też zainteresować się nginxem. Powinien być lżejszy i wydajniejszy dla Wordpressow.

Pawel32 · Kwiecień 28, 2019

Znalazłem jedno główne IP które dzisiaj wykonało prawie 2mln requestów na xml-rpc, po jego zablokowaniu Load Average skacze pomiędzy 0.9% a 2.5% więc potężna różnica

Rolej · Kwiecień 29, 2019

Popracuj nad zabezpieczeniem tego. Jakieś regexpy w CSFie powinny załatwić sprawę.

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