6.e Install and update software packages from Red Hat Network, a remote repository, or from the local file system

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Search for a package (by name and description) on enabled repos

# dnf search chrony
Updating Subscription Management repositories.
Last metadata expiration check: 2:02:27 ago on Mon 23 Nov 2020 03:55:56 PM EST.
===================================== Name Exactly Matched: chrony ======================================
chrony.x86_64 : An NTP client/server
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Lists packages that match name on enabled repos or RPMDB (RPM database)

# dnf list chrony
Updating Subscription Management repositories.
Last metadata expiration check: 2:07:31 ago on Mon 23 Nov 2020 03:55:56 PM EST.
Installed Packages
chrony.x86_64                                     3.5-1.el8                                     @anaconda
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Gets information about a package

# dnf info chrony
Updating Subscription Management repositories.
Last metadata expiration check: 2:07:06 ago on Mon 23 Nov 2020 03:55:56 PM EST.
Installed Packages
Name         : chrony
Version      : 3.5
Release      : 1.el8
Architecture : x86_64
Size         : 634 k
Source       : chrony-3.5-1.el8.src.rpm
Repository   : @System
From repo    : anaconda
Summary      : An NTP client/server
URL          : https://chrony.tuxfamily.org
License      : GPLv2
Description  : chrony is a versatile implementation of the Network Time Protocol (NTP).
             : It can synchronise the system clock with NTP servers, reference clocks
             : (e.g. GPS receiver), and manual input using wristwatch and keyboard. It
             : can also operate as an NTPv4 (RFC 5905) server and peer to provide a time
             : service to other computers in the network.
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dnf can also be used to install local rpm (instead of the 'rpm' command), and it will automatically check for deps and install them.

# dnf install ~/Downloads/tito-0.6.2-1.fc22.noarch.rpm
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You can use the 'install' command to install a repo.

# dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
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Install a group

# dnf group install file-server
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Removes a package

# dnf remove chrony
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Removes a group

# dnf group remove file-server
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The history command allows the user to view what has happened in past transactions and act according to this information.
Show the history of transactions

# dnf history
Updating Subscription Management repositories.
ID     | Command line                                       | Date and time    | Action(s)      | Altered
---------------------------------------------------------------------------------------------------------
     8 | install -y stratis-cli stratisd                    | 2020-11-21 20:52 | Install        |   11    
     7 | install -y autofs                                  | 2020-11-20 17:48 | Install        |    1    
     6 | install -y tuna                                    | 2020-11-16 16:32 | Install        |    1    
     5 | update -y                                          | 2020-11-14 13:41 | Upgrade        |    1    
     4 | install kernel-devel elfutils-libelf-devel         | 2020-11-11 13:37 | Install        |    2    
     3 | groupinstall Development Tools                     | 2020-11-11 13:37 | Install        |    1    
     2 | update                                             | 2020-11-11 13:09 | I, U           |   35 EE
     1 |                                                    | 2020-11-11 12:15 | Install        | 1491 EE
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Redo the last transaction (repeats the specified transaction)

# dnf history redo [0-9]
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Rollback the last transaction (undo all transactions performed after the specified transaction)

# dnf history rollback [0-9]
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Undo the last transaction (removes all changes performed by the specified transaction)

# dnf history undo [0-9]
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Browse to '/etc/yum.repos.d'

# cd /etc/yum.repos.d
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Create a new file with extension of '.repo'. You can use the existing files as templates

[repo name]
name=[description of the repo]
baseurl=[path file:///path/to/reo/; url http://url; ftp ftp://url; for the repo]
enabled=[1=yes, 0=no]
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📝 NOTE: You can also use yum-config-manager, however it's not installed by default. You will need to install either dnf-utils or yum-utils.

Add a repository

# dnf config-manager --add-repo [repo url]
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Enable a repo

# dnf config-manager --enable [repo name]
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Disable a repo

# dnf config-manager --disable [repo name]
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Install 'createrepo'

# dnf install -y createrepo
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Create a folder

# mkdir /root/my_repo  
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Add all the binaries that you would like to have on that repo

# dnf install -y --downloadonly --downloaddir=/root/my_repo nmap httpd mysql
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Use 'createrepo' to create a repo database

# createrepo --database /root/my_repo/
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Add the repo

# dnf config-manager --add-repo file:///root/my_repo/
Updating Subscription Management repositories.
Adding repo from: file:///root/my_repo/
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Check that repo was added

# dnf repolist
Updating Subscription Management repositories.
repo id                                  repo name
rhel-8-for-x86_64-appstream-rpms         Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)
rhel-8-for-x86_64-baseos-rpms            Red Hat Enterprise Linux 8 for x86_64 - BaseOS (RPMs)
root_my_repo                            created by dnf config-manager from file:///root/my_repo/
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Check that you can see the files

# dnf repository-packages root_my_repo list
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Disable the repo

# dnf config-manager --disable root_my_repo_
Updating Subscription Management repositories.
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• dnf repolist - Depending on the exact command lists enabled, disabled or all known repositories
• dnf-config-manager (8) - DNF config-manager Plugin
• createrepo_c.x86_64 : Creates a common metadata repository

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