我最近部署了一台运行Ubuntu 16.04和LAMP的服务器（Apache 2.4.18作为默认的Ubuntu 16.04）。 在服务器投入生产之前，一切正常，但是现在，Apache2每2/3个小时的爬行速度（可能需要每个站点加载2分钟）。 运行sudo service apache2 restart速度再次提高。
我已经在这些时期之一检查了RAM / CPU，并且没有任何地方出现。 服务器是2GB RAM和1个CPU核心。 这是我重新启动Apache之前的top读数
%Cpu(s): 9.2 us, 3.1 sy, 0.0 ni, 86.1 id, 0.0 wa, 0.0 hi, 1.7 si, 0.0 st KiB Mem : 2045252 total, 247516 free, 838924 used, 958812 buff/cache KiB Swap: 524284 total, 523764 free, 520 used. 1047636 avail Mem
在mysqld中使用大量资源的唯一过程是平均使用1 – 2％的CPU和8％的RAM。
/var/log/apache2/error.log中唯一的错误是从12小时前，当我在优化尝试中添加mod_pagespeed 。
[Thu Nov 16 06:52:38.941504 2017] [pagespeed:warn] [pid 5794] [mod_pagespeed 1.12.34.2-0 @5794] RateController: drop deferred fetch of https://SERVERIP/images/banner.png
apache2.conf如下，除了MaxClients之外，所有的设置都是作为主机推荐的VPS，我试着稍微增加但是没有改变。
# Global configuration # # # ServerRoot: The top of the directory tree under which the server's # configuration, error, and log files are kept. # # NOTE! If you intend to place this on an NFS (or otherwise network) # mounted filesystem then please read the Mutex documentation (available # at <URL:http://httpd.apache.org/docs/2.4/mod/core.html#mutex>); # you will save yourself a lot of trouble. # # Do NOT add a slash at the end of the directory path. # #ServerRoot "/etc/apache2" # # The accept serialization lock file MUST BE STORED ON A LOCAL DISK. # Mutex file:${APACHE_LOCK_DIR} default # # PidFile: The file in which the server should record its process # identification number when it starts. # This needs to be set in /etc/apache2/envvars # PidFile ${APACHE_PID_FILE} # # Timeout: The number of seconds before receives and sends time out. # Timeout 300 # # KeepAlive: Whether or not to allow persistent connections (more than # one request per connection). Set to "Off" to deactivate. # KeepAlive On <IfModule mpm_prefork_module> StartServers 4 MinSpareServers 20 MaxSpareServers 40 MaxClients 400 MaxRequestsPerChild 4500 </IfModule> # # MaxKeepAliveRequests: The maximum number of requests to allow # during a persistent connection. Set to 0 to allow an unlimited amount. # We recommend you leave this number high, for maximum performance. # MaxKeepAliveRequests 100 # # KeepAliveTimeout: Number of seconds to wait for the next request from the # same client on the same connection. # KeepAliveTimeout 5 # These need to be set in /etc/apache2/envvars User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} # # HostnameLookups: Log the names of clients or just their IP addresses # eg, www.apache.org (on) or 204.62.129.132 (off). # The default is off because it'd be overall better for the net if people # had to knowingly turn this feature on, since enabling it means that # each client request will result in AT LEAST one lookup request to the # nameserver. # HostnameLookups Off # ErrorLog: The location of the error log file. # If you do not specify an ErrorLog directive within a <VirtualHost> # container, error messages relating to that virtual host will be # logged here. If you *do* define an error logfile for a <VirtualHost> # container, that host's errors will be logged there and not here. # ErrorLog ${APACHE_LOG_DIR}/error.log # # LogLevel: Control the severity of messages logged to the error_log. # Available values: trace8, ..., trace1, debug, info, notice, warn, # error, crit, alert, emerg. # It is also possible to configure the log level for particular modules, eg # "LogLevel info ssl:warn" # LogLevel warn # Include module configuration: IncludeOptional mods-enabled/*.load IncludeOptional mods-enabled/*.conf # Include list of ports to listen on Include ports.conf # Sets the default security model of the Apache2 HTTPD server. It does # not allow access to the root filesystem outside of /usr/share and /var/www. # The former is used by web applications packaged in Debian, # the latter may be used for local directories served by the web server. If # your system is serving content from a sub-directory in /srv you must allow # access here, or in any related virtual host. <Directory /> Options FollowSymLinks AllowOverride None Require all denied </Directory> <Directory /usr/share> AllowOverride None Require all granted </Directory> <Directory /var/www/> Options Indexes FollowSymLinks AllowOverride None Require all granted </Directory> #<Directory /srv/> # Options Indexes FollowSymLinks # AllowOverride None # Require all granted #</Directory> # AccessFileName: The name of the file to look for in each directory # for additional configuration directives. See also the AllowOverride # directive. # AccessFileName .htaccess # # The following lines prevent .htaccess and .htpasswd files from being # viewed by Web clients. # <FilesMatch "^\.ht"> Require all denied </FilesMatch> # # The following directives define some format nicknames for use with # a CustomLog directive. # # These deviate from the Common Log Format definitions in that they use %O # (the actual bytes sent including headers) instead of %b (the size of the # requested file), because the latter makes it impossible to detect partial # requests. # # Note that the use of %{X-Forwarded-For}i instead of %h is not recommended. # Use mod_remoteip instead. # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent # Include of directories ignores editors' and dpkg's backup files, # see README.Debian for details. # Include generic snippets of statements IncludeOptional conf-enabled/*.conf # Include the virtual host configurations: IncludeOptional sites-enabled/*.conf # vim: syntax=apache ts=4 sw=4 sts=4 sr noet LoadModule rewrite_module modules/mod_rewrite.so
该网站使用相当大量的AJAX，在非高峰时段可获得约30名活跃用户，在高峰时段可获得100-150名活跃用户。