42. The access log does not record static files, access log cutting, and static element expiration time

1. Apache static element expiration time

• Most of the elements of the website are static files, such as pictures, css, js, etc. These elements do not need to be recorded

mkdir /data/wwwroot/123.com/images //创建目录，并在这目录下上传一个图片

 curl -x127.0.0.1:80 -I 123.com/images/123.jpg 

then check the log

 tail /usr/local/apache2.4/logs/123.com-access_log 

At this time, the log is recorded

vim /usr/local/apache2.4/conf/extra/httpd-vhosts.conf

Change the virtual host configuration file to the following:

<VirtualHost *:80>
    DocumentRoot "/data/wwwroot/www.123.com"
    ServerName www.123.com
    ServerAlias 123.com
    SetEnvIf Request_URI ".*\.gif$" img
    SetEnvIf Request_URI ".*\.jpg$" img
    SetEnvIf Request_URI ".*\.png$" img
    SetEnvIf Request_URI ".*\.bmp$" img
    SetEnvIf Request_URI ".*\.swf$" img
    SetEnvIf Request_URI ".*\.js$" img
    SetEnvIf Request_URI ".*\.css$" img 
    CustomLog "logs/123.com-access_log" combined env=!img
</VirtualHost>

reload config file

/usr/local/apache2.4/bin/apachectl -t 
 /usr/local/apache2.4/bin/apachectl graceful

Test again, the log file no longer records the access record of the jpg file

2. Access log cutting

The log keeps recording and will fill up the entire disk one day, so it is necessary to let it automatically cut and delete the old log files

• Change the virtual host configuration file to the following:

  <VirtualHost *:80>
  DocumentRoot "/data/wwwroot/www.123.com"
  ServerName www.123.com
  ServerAlias 123.com
  SetEnvIf Request_URI ".*\.gif$" img
  SetEnvIf Request_URI ".*\.jpg$" img
  SetEnvIf Request_URI ".*\.png$" img
  SetEnvIf Request_URI ".*\.bmp$" img
  SetEnvIf Request_URI ".*\.swf$" img
  SetEnvIf Request_URI ".*\.js$" img
  SetEnvIf Request_URI ".*\.css$" img 
  CustomLog "|/usr/local/apache2.4/bin/rotatelogs -l logs/123.com-access_%Y%m%d.log 86400" （-l是指定当前系统时间分隔，86400是指一天之后重新生成另一个，以每天0点开始）  combined env=!img
  </VirtualHost>

• reload config file

  /usr/local/apache2.4/bin/apachectl -t 
  /usr/local/apache2.4/bin/apachectl graceful

• Visit the website casually, you can see the log file with date prefix generated in the llogs directory

  3. Expiration time of static elements

  When the browser accesses the pictures of the website, it will cache the static files in the local computer, so that the next time you visit, you don't have to download it remotely.

Here we set the expiration time of various element caches

• Add configuration

  <IfModule mod_expires.c>
  ExpiresActive on  //打开该功能的开关
  ExpiresByType image/gif  "access plus 1 days"
  ExpiresByType image/jpeg "access plus 24 hours"
  ExpiresByType image/png "access plus 24 hours"
  ExpiresByType text/css "now plus 2 hour"
  ExpiresByType application/x-javascript "now plus 2 hours"
  ExpiresByType application/javascript "now plus 2 hours"
  ExpiresByType application/x-shockwave-flash "now plus 2 hours"
  ExpiresDefault "now plus 0 min"
  </IfModule>

• Due to the need to use expires_module

  /usr/local/apache2.4/bin/apachectl -M | grep expires

If it does not exist, open the apache configuration file to load the plugin

vim /usr/local/apache2.4/conf/httpd.conf 

• reload config file

  /usr/local/apache2.4/bin/apachectl -t 
  /usr/local/apache2.4/bin/apachectl graceful

  

  • The return results of the test data before and after the modification are different. After the modification, Cache-Control: max-age=0 is the effective time of the cache. Now it is necessary to reload
    Expires every time: the time to reload