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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MariaDB Upgrade to the new version | CWP

 

    • Check installed MariaDB version on your server 
      rpm -qa|grep -i maria
    • MariaDB Repository Changes
      Modify repo file to the version you want to upgrade

      vi /etc/yum.repos.d/mariadb.repo
    • Output 
      [mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.2/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
enabled=1
    • Modify 10.2 with the version you want to upgrade
      Example for upgrade to MariaDB 10.5

      [mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.5/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
enabled=1
    • Stop and remove the old version of MariaDB (Databases will not be removed) 
      service mysql stop
service mariadb stop
systemctl disable mariadb
rpm --nodeps -ev MariaDB-server
  • Install the new version of MariaDB 
    yum clean all
yum -y update "MariaDB-*"
yum -y install MariaDB-server
systemctl enable mariadb
service mariadb start
mysql_upgrade
  • Check for the custom configuration 
    diff -Bw /etc/my.cnf.d/server.cnf.rpmsave /etc/my.cnf.d/server.cnf
  • Verify upgraded packages 
    rpm -qa|grep -i maria
  • That’s All

Yum repository list of the available versions
http://yum.mariadb.org/