Mastering Linux YUM Repositories

1. Function of YUM RepositoriesPackage manager, similar to software managers like 360.

YUM can download (from repositories, while also downloading dependencies), install, update, and uninstall software.It operates at a lower level through RPM for software installation, so after installing software with YUM, you can query it using rpm.

rpm -qa | grep SoftwareName

2. Advantages of YUM Repositories:

• RPM installation (download software, install separately, needs to resolve dependencies)

• Source installation (download source package -> extract, enter directory -> configure + compile + install + resolve dependencies)
• YUM repositories: an upgraded version of RPM package management that can automatically resolve dependencies between packages, improving the efficiency of operations personnel. Installed packages can be queried using rpm -q.

2. Classification of YUM Repositories:View local repositories

yum repolist all

3. Backup of Local YUM5. Creating a Local Repositorysr0 is the CD-ROM drive, which is not mounted by default.

Package Files

# Repository metadata files (in the mounted CD's repodata/ directory)
repomd.xml          # Repository metadata index
primary.xml.gz      # Main package information (name, version, dependencies)
filelists.xml.gz    # Package file list
other.xml.gz        # Other package information
comps.xml           # Component grouping information
# YUM cache files
/var/cache/yum/x86_64/7/local/repodata/repomd.xml
/var/cache/yum/x86_64/7/local/repodata/primary.xml.gz