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Software Management
Repositories & GPG keys

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Domain 3 · Software ManagementEX200 V10 (RHEL 10)

Repositories & GPG keys

Add third-party repositories, manage .repo files, enable/disable repos, and import GPG keys. BaseOS and AppStream basics.

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Repositories & GPG keys — CertForged

◆Concept — DNF repositories — where packages come from

A DNF repository is a signed directory of RPMs plus metadata (repodata/repomd.xml, primary.xml.gz, etc.) that DNF can list and install from. On RHEL you typically have the vendor-provided BaseOS and AppStream repos (which ship with redhat-release), plus any third-party repos you add — EPEL, vendor package archives, or your own local mirror. On the exam you'll often be asked to add a local repo (usually a mounted ISO or a file:// URL) and install packages from it.

✨Mental Model

A repo config file is a postal address book entry: it gives DNF a name, a URL, and instructions on whether to trust the sender's signature. DNF reads every .repo file under /etc/yum.repos.d/, builds a combined mailing list of addresses, and then "mail orders" packages from whichever one has what you want.