What is YUM in Linux
YUM (Yellowdog Updater Modified) is a package management tool used in many Linux distributions such as CentOS, Fedora, and Red Hat Enterprise Linux. It helps to install, update, and remove software packages in a simple and efficient manner.
With YUM, users can search for available packages and dependencies, check the status of installed packages, and update packages to the latest versions. It also handles any required dependencies automatically during package installation and removal.
YUM uses a configuration file that specifies the list of repositories where the package updates are stored. These repositories can be local or remote, and YUM checks for updates in these repositories at regular intervals.
One of the main advantages of YUM is its ease of use. With just a few simple commands, users can install or update multiple packages at once. It also simplifies the process of resolving dependencies, ensuring that all required software components are installed correctly.
Overall, YUM is a powerful and reliable tool that makes package management in Linux distributions a straightforward process. It saves time and effort for system administrators and helps ensure that the system is up-to-date with the latest software packages and security updates.
How to Clean YUM Cache on CentOS
To clean the YUM cache on CentOS, you need to use the “yum clean” command. This command helps to clean the cached data for packages and metadata. There are different options available with the “yum clean” command such as “all”, “packages”, “metadata”, “dbcache”, “headers”, and “expire-cache”. Here’s how to use them:
- To clean all cached data, run the following command:
sudo yum clean all
This command will clean all the cached data, including packages, metadata, and headers.
- To clean only cached packages, run the following command:
sudo yum clean packages
This command will clean only the cached packages, leaving the metadata and headers intact.
- To clean metadata and package headers, run the following command:
sudo yum clean metadata
This command will clean the metadata and headers for all repositories.
- To clean only the cache for the database files, run the following command:
sudo yum clean dbcache
This command will clean the cache for the database files only.
- To clean only the cache for header files, run the following command:
sudo yum clean headers
This command will clean the cache for header files only.
- To clean the cache for expired metadata and headers, run the following command:
sudo yum clean expire-cache
This command will clean the cache for expired metadata and headers only.
In summary, cleaning the YUM cache on CentOS is a straightforward process. You can use the “yum clean” command with different options to clean specific cached data. By doing this, you can free up disk space and ensure that YUM has the latest information about available packages.