The --skip-broken command line switch is not recognized by DNF. The semantics this was supposed to trigger in Yum is now the default for plain dnf update. There is no equivalent for yum --skip-broken update foo, as silently skipping foo in this case only amounts to masking an error contradicting the user request. To try using the latest versions of packages in transactions there is the --best command line switch.
Invoking dnf update or dnf upgrade, in all their forms, has the same effect in DNF, with the latter being preferred. In Yum yum upgrade was exactly like yum --obsoletes update.
The clean_requirements_on_remove switch is on by default in DNF. It can thus be confusing to compare the “erase” operation results between DNF and Yum as by default DNF is often going to remove more packages.
The Yum version of this command is maintained for legacy reasons only. The user can just do dnf provides to find out what package gives a particular provide.
Yum only respects excludes during installs and upgrades. DNF extends this to all operations, among others erasing and listing. If you e.g. want to see a list of all installed python-f* packages but not any of the Flask packages, the following will work:
dnf -x '*flask*' list installed 'python-f*'
DNF drops Yum’s protected_packages configuration option. Generally, DNF lets the user do what she specified, even have DNF itself removed. Similar functionality can be implemented by a plugin.
In Yum, the running kernel is spared. There is no reason to keep this in DNF, the user can always specify concrete versions on the command line, e.g.:
dnf erase kernel-3.9.4
After UsrMove there’s no directory /bin on Fedora systems and no files get installed there, /bin is only a symlink created by the filesystem package to point to /usr/bin. Resolving the symlinks to their real path would only give the user false sense that this works while in fact provides requests using globs such as:
dnf provides /b*/<file>
will fail still (as it does in Yum now). To find what provides a particular binary use the actual path for binaries on Fedora:
dnf provides /usr/bin/<file>
This config option has been dropped. When DNF sees several groups with the same group id it merges the groups’ contents together.
To simplify things for the user, DNF uses metadata_expire for both expiring metadata and the mirrorlist file (which is a kind of metadata itself).
Done to simplify the configuration. User will typically want to decide what packages to install per-group and not via a global setting:
dnf group install with-optional Editors
Dropping this config option with blurry semantics simplifies the configuration. DNF behaves as if this was disabled. If the user wanted to upgrade everything to the latest version she’d simply use dnf upgrade.
DNF tolerates the use of other package managers. Then it is possible that not all changes to RPMDB are stored in the history of transactions. Therefore, DNF does not fail if such a situation is encountered and thus the force option is not needed anymore.
Time after time one needs to remove an installed package and replace it with a different one, providing the same capabilities while other packages depending on these capabilities stay installed. Without (transiently) breaking consistency of the package database this can be done by performing the erase and the install in one transaction. The common way to setup such transaction in Yum is to use yum shell.
There is no shell in DNF but the case above is still valid. We provide the --allowerasing switch for this purpose, e.g. say you want to replace A (providing P) with B (also providing P, conflicting with A) without deleting C (which requires P) in the process. Use:
dnf --allowerasing install B
In this case, DNF recognizes last as the ID of the last transaction (like other history subcommands), while Yum considers it a package name. It goes similarly for last-N.
During its depsolving phase, Yum outputs lines similar to:
---> Package rubygem-rhc.noarch 0:1.16.9-1.fc19 will be an update --> Processing Dependency: rubygem-net-ssh-multi >= 1.2.0 for package: rubygem-rhc-1.16.9-1.fc19.noarch
DNF does not output information like this. The technical reason is that depsolver below DNF always considers all dependencies for update candidates and the output would be very long. Secondly, even in Yum this output gets confusing very quickly especially for large transactions and so does more harm than good.
See the the related Fedora bug 1044999.
When one executes:
yum provides sandbox
Yum applies extra heuristics to determine what the user meant by sandbox, for instance it sequentially prepends entries from the PATH environment variable to it to see if it matches a file provided by some package. This is an undocumented behaivor that DNF does not emulate. Just typically use:
dnf provides /usr/bin/sandbox
dnf provides '*/sandbox'
to obtain similar results.
This switch has been dropped. It is not documented for Yum and of a questionable use (all plugins are enabled by default).
DNF supports the throttle and bandwidth options familiar from Yum. Contrary to Yum, when multiple downloads run simultaneously the total downloading speed is throttled. This was not possible in Yum since downloaders ran in different processes.
The boolean deltarpm option controls whether delta RPM files are used. Compared to Yum, DNF does not support deltarpm_percentage and instead chooses some optimal value of DRPM/RPM ratio to decide whether using deltarpm makes sense in the given case.
DNF will terminate early with an error if a command is executed requesting an installing operation on a local .srpm file:
$ dnf install fdn-0.4.17-1.fc20.src.rpm tour-4-6.noarch.rpm Resolving dependencies --> Starting dependency resolution ---> Package fdn.src 0.4.17-1.fc20 will be installed ---> Package tour.noarch 4-6 will be installed --> Finished dependency resolution Error: Will not install a source rpm package (fdn-0.4.17-1.fc20.src).
Yum will only issue warning in this case and continue installing the “tour” package. The rationale behind the result in DNF is that a program should terminate with an error if it can not fulfill the CLI command in its entirety.
DNF will not magically replace a request for installing package X to installing package Y if Y obsoletes X. Yum does this if its obsoletes config option is enabled but the behavior is not properly documented and can be harmful.
See the the related Fedora bug 1096506 and guidelines for renaming and obsoleting packages in Fedora.