Fedora uses Security-Enhanced Linux by default, which implements a variety of security policies, including mandatory access controls, which Fedora adopted early on.Now, to setup a basic fedora container with a bash shell, we just run one command.See Update procedure in Drupal 8 for Drupal 8 Updating.
The first try probably was running off cached metadata that was old and so it found no updates.
The default for dnf is to automatically update the package information every 3 hours.
__________________ Fedora 26 X64 bit Cinnamon edition on Lenovo Think Pad e550 with Intel core i7 5500 CPU @ 2.40 GH X 2, RAM = 8 GB, HHD = 1 TB, Hybrid VGA (Intel Corporation HD Graphic 5500 Radeon R7 M265 2GB) directly sponsored by the Fedora Project or Red Hat, Inc.
Loading "installonlyn" plugin Loading "security" plugin Setting up repositories Reading repository metadata in from local files Installed Packages perl.i386 4:5.8.8-10.el5_0.2 installed perl-Archive-Tar.noarch 1.30-1.fc6 installed perl-BSD-Resource.i386 1.28-1.fc6.1 installed perl-Compress-Zlib.i386 1.42-1.fc6 installed perl-DBD-My SQL.i386 3.0007-1.fc6 installed perl-DBI.i386 1.52-1.fc6 installed perl-Digest-HMAC.noarch 1.01-15 installed perl-Digest-SHA1.i386 2.11-1.2.1 installed perl-HTML-Parser.i386 3.55-1.fc6 installed ..... He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector.