Chapter 3. Finding RHEL 8 content
The following sections describe how to locate and examine content in the AppStream and BaseOS repositories in Red Hat Enterprise Linux 8.
- Section 3.1, “Searching for a package” describes how to search for packages providing desired content.
- Section 3.2, “Listing available modules” describes how to list available modules and find out details about them.
- Example 3.1, “Finding out details about a module” contains an example of steps needed to examine a module in more detail.
- Section 3.3, “Commands for listing content” provides a reference of the commands useful for inspecting content.
3.1. Searching for a package
This section describes steps needed for finding a package providing a particular application or other content.
Prerequisites
- Name of the desired application or content must be known
Procedure
Search for a package with a text string, such as application name:
$ yum search "text string"
View details about a package:
$ yum info package
3.2. Listing available modules
This section describes steps needed for finding what modules are available and what their details are.
Procedure
List module streams available to your system:
$ yum module list
The output of this command lists module streams with name, stream, profiles, and summary on a separate line.
Display details about a module, including a description, a list of all profiles, and a list of all provided packages:
$ yum module info module-name
Optional: You can also list which of these packages are installed by each of module profiles:
$ yum module info --profile module-name
Display the current status of a module, including enabled streams and installed profiles:
$ yum module list module-name
Additional resources
Example 3.1. Finding out details about a module
This example shows how to locate a module in the AppStream repository and how to find out more about its contents.
The outputs in this example have been edited for brevity. Actual outputs may contain more information than shown here.
Procedure
List available modules:
$
yum module list
Name Stream Profiles Summary (...) postgresql 9.6 client, PostgreSQL server and client module server [d] postgresql 10 [d] client, PostgreSQL server and client module server [d] postgresql 12 client, PostgreSQL server and client module server [d] (...) Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalledExamine details of the postgresql module:
$
yum module info postgresql
Name : postgresql Stream : 10 [d][a] Version : 820190104140132 Context : 9edba152 Profiles : client, server [d] Default profiles : server Repo : appstream Summary : PostgreSQL server and client module Description : (...) (...) Name : postgresql Stream : 12 Version : 8010120191120141335 Context : e4e244f9 Profiles : client, server [d] Default profiles : server Repo : appstream Summary : PostgreSQL server and client module Description : (...) (...) Name : postgresql Stream : 9.6 Version : 820190104140337 Context : 9edba152 Profiles : client, server [d] Default profiles : server Repo : appstream Summary : PostgreSQL server and client module Description : (...) (...) Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled, [a]ctiveBecause no stream is specified, all streams are used for the listing.
Examine profiles available in stream 10 of the postgresql module:
$
yum module info --profile postgresql:10
(...) Name : postgresql:10:820190104140132:9edba152:x86_64 client : postgresql server : postgresql-serverEach of the profiles installs a different set of packages, including their dependencies.
Install the postgresql module using the default stream 10 and profile server:
#
yum module install postgresql
Dependencies resolved. ==================================================================== Package Version Repository Size ==================================================================== Installing group/module packages: postgresql-server 10.6-1.module+el8+2469+5ecd5aae appstream 5.1 M Installing dependencies: libpq 10.5-1.el8 appstream 188 k postgresql 10.6-1.module+el8+2469+5ecd5aae appstream 1.5 M Installing module profiles: postgresql/server Enabling module streams: postgresql 10 Transaction Summary ==================================================================== Install 3 Packages Total download size: 6.7 M Installed size: 27 M Is this ok [y/N]: y (...)The stream 10 is enabled and packages in its profile server installed.
Inspect the current status of the postgresql module:
$
yum module list postgresql
Name Stream Profiles Summary postgresql 9.6 client, server [d] (...) postgresql 10 [d][e] client, server [d] [i] (...) postgresql 12 client, server [d] (...) Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalledThe output shows that the default stream 10 is enabled and its profile server is installed.
3.3. Commands for listing content
Following are the commonly used commands for finding content and its details.
- List available packages
$ yum list available
- Search available YUM repositories for a selected package
$ yum repoquery package
- Search for a package using arbitrary text string
$ yum search "text string"
- Display details for a package
$ yum info package
- Find out which modules provide a package
$ yum module provides package
If the package is available outside any modules, the output of this command is empty.
- List available modules
$ yum module list
- Display details of a module
$ yum module info module-name
- List packages installed by profiles of a module using the default stream
$ yum module info --profile module-name
- Display packages installed by profiles of a module using a specified stream
$ yum module info --profile module-name:stream
- Display the current status of a module
$ yum module list module-name