RHCSA RHCSA Software Package Management 4 — Questions and Answers
Question 1: Which command rolls back the most recent DNF transaction?
- dnf history undo last (Correct answer)
- dnf rollback
- dnf undo last
- dnf history rollback 1
Correct answer: dnf history undo last
'dnf history undo last' reverses the most recent transaction; you can also specify a transaction ID instead of 'last'.
Question 2: How do you install a specific version of a package, e.g., httpd version 2.4.37?
- dnf install httpd-2.4.37 (Correct answer)
- dnf install httpd --version 2.4.37
- dnf install httpd=2.4.37
- rpm -i httpd --version=2.4.37
Correct answer: dnf install httpd-2.4.37
DNF uses the package-version syntax 'packagename-version' (including release and arch optionally) to pin a specific version for installation.
Question 3: A package was installed via RPM but is not showing up in 'dnf list installed'. What is the most likely reason?
- rpm and dnf share the same RPM database, so this should not happen — the package would appear (Correct answer)
- The package was installed to a non-default prefix
- DNF caches are out of date
- The package has no dnf metadata
Correct answer: rpm and dnf share the same RPM database, so this should not happen — the package would appear
Both rpm and dnf use the same RPM database (/var/lib/rpm), so any rpm-installed package is visible to 'dnf list installed'.
Question 4: What does the 'dnf autoremove' command do?
- Removes packages that were installed as dependencies but are no longer needed (Correct answer)
- Removes all packages not in the Base group
- Automatically removes the oldest kernel
- Removes packages marked as auto-updated
Correct answer: Removes packages that were installed as dependencies but are no longer needed
'dnf autoremove' cleans up leaf dependency packages that were auto-installed but are no longer required by any explicitly installed package.
Question 5: How can you enable a disabled repository for a single DNF command without editing its .repo file?
- dnf --enablerepo=<repoid> install <package> (Correct answer)
- dnf enable <repoid> && dnf install <package>
- dnf install <package> --repo=<repoid>
- dnf repolist enable <repoid>
Correct answer: dnf --enablerepo=<repoid> install <package>
The --enablerepo flag temporarily enables a disabled repository for just that invocation without modifying the configuration file.
Question 6: Which RPM query shows all configuration files owned by the 'sshd' package?
- rpm -qc openssh-server (Correct answer)
- rpm -ql openssh-server
- rpm -qd openssh-server
- rpm -qi openssh-server
Correct answer: rpm -qc openssh-server
'rpm -qc' lists all configuration files (marked %config in the spec) belonging to a package.
Question 7: What happens when you run 'dnf upgrade' with no package name specified?
- All installed packages with available updates are upgraded (Correct answer)
- Only security updates are applied
- The system prompts for which packages to upgrade
- Only packages in the Base group are upgraded
Correct answer: All installed packages with available updates are upgraded
'dnf upgrade' with no arguments updates all installed packages for which newer versions exist in enabled repositories.
RHCSA RHCSA Software Package Management 4
Which command rolls back the most recent DNF transaction?