[chups]

Подскажите пожалуйста, в чем может быть проблема.

DO 2 ядра, 2 гига, SSD. 300 тел онлайна кладут сервак.
Данные по htop: память - 1.6 из 2 GB занято, 2 ядра по 100% забиты. Стоит nginx + php-fpm 5.6 и mysql 5.6

Если равномерно идет трафик (15-20к) и онлайн 200-250 - все норм. Как только людей в онлайне становится более 300 - сервак падает.
Очень нужна помощь!

[WSairus]

chups, вы предлагаете гадание на кофейной гуще? Хорошо бы знать какой именно процесс падает (предположу что mySQL из-за нехватки памяти). Нет данных по доступному кешу, использованию свопа, ожиданию чтения (wa). Приложите хоть пару скринов (top например и конфиг nginx в спойлерах).
Если такая большая нагрузка - можно попробовать настроить nginx - посмотрите есть ли кеширование статики на клиенте (expires), включено ли сжатие (можно попробовать отключить или снизить для снижения нагрузки CPU).
Скорее всего нужно настраивать и mySQL, смотреть количество подключений, отлавливать и оптимизировать тяжелые запросы, но тут я не особо разбираюсь.

[chups]

База не падает. Симптомы: очень долгая загрузка страницы (~40 секунд). Клиентское кеширование включено. Своп не используется.
Скрины дать пока не могу. Немного позже выложу.

[WSairus]

Тогда (хотя информации явно недостаточно), предположу, что оптимизировать уже нечего, ожидание связано со 100% загрузкой процессоров (обработка скриптов).

[brainix]

chups, а цмс какая?

[chups]

WSairus, может я что-то упустил? С радостью предоставлю...

Конфиг nginx

server {

gzip on;
gzip_min_length 1000;
gzip_proxied any;
gzip_types text/plain application/xml application/x-javascript text/javascript text/css text/json application/javascript;
gzip_disable "msie6";
gzip_comp_level 5;
gzip_vary on;

location ~ \.php$ {
fastcgi_index index.php;
include /etc/nginx/fastcgi_params;
if ( -f $request_filename ) {
#fastcgi_pass 127.0.0.1:9000;
fastcgi_pass unix:/tmp/wwwpool.sock;
}
fastcgi_param SCRIPT_FILENAME /public_html$fastcgi_script_name;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
}
}

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php-fpm

Start a new pool named 'www'.
[www]

; The address on which to accept FastCGI requests.
; Valid syntaxes are:
; 'ip.add.re.ssort' - to listen on a TCP socket to a specific address on
; a specific port;
; 'port' - to listen on a TCP socket to all addresses on a
; specific port;
; '/path/to/unix/socket' - to listen on a unix socket.
; Note: This value is mandatory.
; listen = 127.0.0.1:9000
listen = /tmp/wwwpool.sock

; Set listen(2) backlog. A value of '-1' means unlimited.
; Default Value: -1
;listen.backlog = -1
.
; List of ipv4 addresses of FastCGI clients which are allowed to connect.
; Equivalent to the FCGI_WEB_SERVER_ADDRS environment variable in the original
; PHP FCGI (5.2.2+). Makes sense only with a tcp listening socket. Each address
; must be separated by a comma. If this value is left blank, connections will be
; accepted from any ip address.
; Default Value: any
; listen.allowed_cliDDDDDents = 127.0.0.1

; Set permissions for unix socket, if one is used. In Linux, read/write
; permissions must be set in order to allow connections from a web server. Many
; BSD-derived systems allow connections regardless of permissions..
; Default Values: user and group are set as the running user
; mode is set to 0660
listen.owner = nginx
listen.group = nginx
listen.mode = 0660
; Unix user/group of processes
; Note: The user is mandatory. If the group is not set, the default user's group
; will be used.
; RPM: apache Choosed to be able to access some dir as httpd
user = apache
; RPM: Keep a group allowed to write in log dir.
group = apache

; Choose how the process manager will control the number of child processes.
; Possible Values:
; static - a fixed number (pm.max_children) of child processes;
; dynamic - the number of child processes are set dynamically based on the
; following directives:
; pm.max_children - the maximum number of children that can
; be alive at the same time.
; pm.start_servers - the number of children created on startup.
; pm.min_spare_servers - the minimum number of children in 'idle'
; state (waiting to process). If the number
; of 'idle' processes is less than this
; number then some children will be created.
; pm.max_spare_servers - the maximum number of children in 'idle'
; state (waiting to process). If the number
; of 'idle' processes is greater than this
; number then some children will be killed.
; Note: This value is mandatory.
pm = dynamic
; The number of child processes to be created when pm is set to 'static' and the
; maximum number of child processes to be created when pm is set to 'dynamic'.
; This value sets the limit on the number of simultaneous requests that will be
; served. Equivalent to the ApacheMaxClients directive with mpm_prefork.
; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP
; CGI.
; Note: Used when pm is set to either 'static' or 'dynamic'
; Note: This value is mandatory.
pm.max_children = 500

; The number of child processes created on startup.
; Note: Used only when pm is set to 'dynamic'
; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2
pm.start_servers = 5

; The desired minimum number of idle server processes.
; Note: Used only when pm is set to 'dynamic'
; Note: Mandatory when pm is set to 'dynamic'
pm.min_spare_servers = 5

; The desired maximum number of idle server processes.
; Note: Used only when pm is set to 'dynamic'
; Note: Mandatory when pm is set to 'dynamic'
pm.max_spare_servers = 15
.
; The number of requests each child process should execute before respawning.
; This can be useful to work around memory leaks in 3rd party libraries. For
; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS.
; Default Value: 0
pm.max_requests = 500
; The URI to view the FPM status page. If this value is not set, no URI will be
; recognized as a status page. By default, the status page shows the following
; information:
; accepted conn - the number of request accepted by the pool;
; pool - the name of the pool;
; process manager - static or dynamic;
; idle processes - the number of idle processes;
; active processes - the number of active processes;
; total processes - the number of idle + active processes.
; The values of 'idle processes', 'active processes' and 'total processes' are
; updated each second. The value of 'accepted conn' is updated in real time.
; Example output:
; accepted conn: 12073
; pool: www
; process manager: static
; idle processes: 35
; active processes: 65
; total processes: 100
; By default the status page output is formatted as text/plain. Passing either
; 'html' or 'json' as a query string will return the corresponding output
; syntax. Example:
; http://www.foo.bar/status
; http://www.foo.bar/status?json
; http://www.foo.bar/status?html
; Note: The value must start with a leading slash (/). The value can be
; anything, but it may not be a good idea to use the .php extension or it
; may conflict with a real PHP file.
; Default Value: not set.
;pm.status_path = /status
; The ping URI to call the monitoring page of FPM. If this value is not set, no
; URI will be recognized as a ping page. This could be used to test from outside
; that FPM is alive and responding, or to
; - create a graph of FPM availability (rrd or such);
; - remove a server from a group if it is not responding (load balancing);
; - trigger alerts for the operating team (24/7).
; Note: The value must start with a leading slash (/). The value can be
; anything, but it may not be a good idea to use the .php extension or it
; may conflict with a real PHP file.
; Default Value: not set
;ping.path = /ping

; This directive may be used to customize the response of a ping request. The
; response is formatted as text/plain with a 200 response code.
; Default Value: pong
;ping.response = pong
.
; The timeout for serving a single request after which the worker process will
; be killed. This option should be used when the 'max_execution_time' ini option
; does not stop script execution for some reason. A value of '0' means 'off'.
; Available units: s(econds)(default), m(inutes), h(ours), or d(ays)
; Default Value: 0
;request_terminate_timeout = 0
.
; The timeout for serving a single request after which a PHP backtrace will be
; dumped to the 'slowlog' file. A value of '0s' means 'off'.
; Available units: s(econds)(default), m(inutes), h(ours), or d(ays)
; Default Value: 0
;request_slowlog_timeout = 0
; The log file for slow requests
; Default Value: not set
; Note: slowlog is mandatory if request_slowlog_timeout is set
slowlog = /var/log/php-fpm/www-slow.log
.
; Set open file descriptor rlimit.
; Default Value: system defined value
;rlimit_files = 1024
.
; Set max core size rlimit.
; Possible Values: 'unlimited' or an integer greater or equal to 0
; Default Value: system defined value
;rlimit_core = 0
.
; Chroot to this directory at the start. This value must be defined as an
; absolute path. When this value is not set, chroot is not used.
; Note: chrooting is a great security feature and should be used whenever.
; possible. However, all PHP paths will be relative to the chroot
; (error_log, sessions.save_path, ...).
; Default Value: not set
;chroot =.
.
; Chdir to this directory at the start. This value must be an absolute path.
; Default Value: current directory or / when chroot
;chdir = /var/www
.
; Redirect worker stdout and stderr into main error log. If not set, stdout and
; stderr will be redirected to /dev/null according to FastCGI specs.
; Default Value: no
catch_workers_output = yes
; Limits the extensions of the main script FPM will allow to parse. This can
; prevent configuration mistakes on the web server side. You should only limit
; FPM to .php extensions to prevent malicious users to use other extensions to
; exectute php code.
; Note: set an empty value to allow all extensions.
; Default Value: .php
;security.limit_extensions = .php .php3 .php4 .php5

; Pass environment variables like LD_LIBRARY_PATH. All $VARIABLEs are taken from
; the current environment.
; Default Value: clean env
;env[HOSTNAME] = $HOSTNAME
;env[PATH] = /usr/local/bin:/usr/bin:/bin
;env[TMP] = /tmp
;env[TMPDIR] = /tmp
;env[TEMP] = /tmp

; Additional php.ini defines, specific to this pool of workers. These settings
; overwrite the values previously defined in the php.ini. The directives are the
; same as the PHP SAPI:
; php_value/php_flag - you can set classic ini defines which can
; be overwritten from PHP call 'ini_set'..
; php_admin_value/php_admin_flag - these directives won't be overwritten by
; PHP call 'ini_set'
; For php_*flag, valid values are on, off, 1, 0, true, false, yes or no.

; Defining 'extension' will load the corresponding shared extension from
; extension_dir. Defining 'disable_functions' or 'disable_classes' will not
; overwrite previously defined php.ini values, but will append the new value
; instead.

; Default Value: nothing is defined by default except the values in php.ini and
; specified at startup with the -d argument
;php_admin_value[sendmail_path] = /usr/sbin/sendmail -t -i -f www@my.domain.com
;php_flag[display_errors] = off
php_admin_value[error_log] = /var/log/php-fpm/www-error.log
php_admin_flag[log_errors] = on
;php_admin_value[memory_limit] = 128M
; Set session path to a directory owned by process user
php_value[session.save_handler] = files
php_value[session.save_path] = /var/lib/php/session
php_value[soap.wsdl_cache_dir] = /var/lib/php/wsdlcache
php_admin_value[date.timezone] = 'Europe/Moscow'

[свернуть]

Вывод htop

[свернуть]

brainix, CMS Question2Answer

[Ems]

300 онлайн - это гости или залогенные пользователи сайта?

[chups]

Ems, гости/уники. Залогиненых за весь день человек 300 максимум. Основная масса - гости.

[WSairus]

chups, по nginx:
1) Не увидел worker_processes (выше секции server) - должно быть 2 (по числу процессоров);
2) Не увидел sendfile on; (Если версия nginx поддерживает и ОС тоже).
3) Попробуйте убрать gzip (закомментировать) и посмотреть на нагрузку - должен сильно разгрузиться процессор за счет канала естественно.
4) Попробуйте keepalive_timeout 30; (число можете подобрать сами, от 15 до 60 - в зависимости от наличия AJAX и прочих динамических вещей).
5) server_tokens off; для отключения отображения версии (безопасность )

По настройкам php-fpm проблем не вижу. Памяти тоже достаточно. Мне кажется что висел у Вас проц, хотя, нельзя исключить и mySQL - посмотрите логи медленных запросов... или ковырять CMS . Может еще кто что знает, что увидел - написал.

[Ems]

Ещё вариант поставить Varnish, по умолчанию будут отдаваться закешированные страницы пользователям, а залогененым live-версия. Правда нужно настроить сколько ему выделять памяти и как часто обновлять кеш. Нагрузка должна снизиться заметно.