Dev {Tricks}

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How to Clean the YUM Cache in CentOS

We need to clean the YUM cache to reclaim the disk space used or to fix some errors due to corrupted metadata files.

  • Clean all the cached packages from the enabled repository cache directory. 
    yum clean packages
  • Delete package headers. 
    yum clean headers
  • Delete metadata for each enabled repository. 
    yum clean metadata
  • Clean database cache

yum clean dbcache
  • Clean expire cache

yum clean expire-cache
  • Clean all cached information. 
    yum clean all

Done!

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How to run php file through command line? How do I enable PHP?

For Windows, make sure you have PHP installed and type this into command prompt:

C:\Path\To\php.exe C:\Path\To\Your\script.php

And for Linux/Unix:

php /path/to/script.php
  • Go to Tools & Settings > Updates to start the Plesk Installer.
  • Click Add/Remove Components, expand the Web hosting section, and
  • Then the PHP interpreter versions section.
  • PHP from OS vendor (install)

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How to disable functions using the PHP disable_functions directive in php ini

  • PHP disable_functions Executable Handling

The disable_function is used to stop certain dangerous PHP functions from executing.

Example of disable_function.

disable_functions = "exec, system"

Use the disable_functions directive in php.ini file to disable specific functions.
At least disable exec(), shell_exec() and system(). (If using WordPress).

disable_functions = "exec, passthru, shell_exec, system, proc_open, popen, curl_exec, curl_multi_exec, parse_ini_file, show_source"

 

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Error 503 Backend fetch failed

Error 503 backend fetch failed varnish cache server

Cause:

Mainly due to memory allocation issues or bad varnish cache configuration.

Solution:

  1. Reboot
  2. Clear cache
  3. Rebuilt WebServers