Chapter 4. Installing RHEL 8 content
In the following sections, learn how to install content in Red Hat Enterprise Linux 8:
4.1. Installing a package
To install a package, complete the following steps.
Procedure
Install a package:
# yum install packageReplace package with the name of the package.
- If the package is not provided by any module stream, this procedure is identical to the procedure used on earlier versions of Red Hat Enterprise Linux.
- If the package is provided by an module stream that is enabled, the package is installed without any further manipulation.
If the package is provided by a module stream marked as default,
yumautomatically enables that module stream before installing this package.ImportantIt is recommended to always select a specific module stream for installation instead of relying on the default stream. Certain default module streams reach the End of Life status prior to the end of the RHEL major release. Always consider each stream’s lifecycle.
- If the package is provided by a module stream that is not active (neither of the above cases), it is not recognized until you manually enable the respective module stream.
4.2. Selecting a stream before installation of packages
It is recommended to always select a specific module stream for installation. Always consider each stream’s life cycle.
Certain default module streams reach the End of Life status prior to the end of the RHEL major release.
To install packages from a non-default stream, enable the stream first.
Prerequisites
- You understand the concept of an active module stream.
Procedure
Enable the module stream:
# yum module enable module-name:streamReplace module-name and stream with names of the module and stream.
yumasks for confirmation and the stream is enabled and active.NoteIf another stream of the module was previously active because it was default, it is no longer active.
Additional resources
4.3. Installing modular content
To install modular content provided by a module stream or a profile, complete the following steps.
Prerequisites
- You understand the concept of an active module stream.
- You do not have any packages installed from another stream of the same module.
Procedure
To install a selected module stream, use:
# yum module install module-name:streamBy running this command, you automatically enable selected stream. Note that if a default profile is defined for the stream, this profile is automatically installed.
ImportantAlways consider the module stream’s life cycle.
To install a selected profile of the module stream, use:
# yum module install module-name:stream/profileBy running this command, you enable the stream and install the recommended set of packages for a given stream (version) and profile (purpose) of the module.
Additional resources
Example 4.1. Installing a non-default stream of an application
The following is an example of how to install an application from a non-default stream (version), namely, the PostgreSQL server (the postgresql-server package) in version 13. The default stream provides version 10.
Procedure
List modules that provide the
postgresql-serverpackage to see which streams are available:$ yum module list postgresql Name Stream Profiles Summary postgresql 9.6 client, server [d] PostgreSQL server and client module postgresql 10 [d] client, server [d] PostgreSQL server and client module postgresql 12 client, server [d] PostgreSQL server and client module postgresql 13 client, server [d] PostgreSQL server and client module postgresql 15 client, server [d] PostgreSQL server and client module Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalledThe output shows that the
postgresqlmodule is available with streams9.6,10,12,13, and15. The default stream is10.Install the packages provided by the
postgresqlmodule in stream13:# yum module install postgresql:13 ... Dependencies resolved. =================================================================================================================== Package Architecture Version Repository Size =================================================================================================================== Installing group/module packages: postgresql-server x86_64 13.10-1.module+el8.7.0+18279+1ca8cf12 rhel-AppStream 5.6 M Installing dependencies: libicu x86_64 60.3-2.el8_1 rhel 8.8 M libpq x86_64 13.5-1.el8 rhel-AppStream 198 k postgresql x86_64 13.10-1.module+el8.7.0+18279+1ca8cf12 rhel-AppStream 1.5 M Installing module profiles: postgresql/server Enabling module streams: postgresql 13 Transaction Summary =================================================================================================================== Install 4 Packages Total download size: 16 M Installed size: 61 M Is this ok [y/N]: y ... Installed: libicu-60.3-2.el8_1.x86_64 libpq-13.5-1.el8.x86_64 postgresql-13.10-1.module+el8.7.0+18279+1ca8cf12.x86_64 postgresql-server-13.10-1.module+el8.7.0+18279+1ca8cf12.x86_64 Complete!Because the installation profile was not specified, the default profile
serverwas used.Verify the installed version of PostgreSQL:
$ postgres --version postgres (PostgreSQL) 13.10
4.4. Running installed content
New commands are usually enabled after you install content from RHEL 8 repositories. If the commands originated from RPM packages that were enabled by a module, the experience of using these command should be no different.
Procedure
To run the new commands, enter them directly:
$ commandReplace command with the name of the command you want to run.
In RHEL 8, GCC Toolset is packaged as a Software Collection. To run a command from a component packaged as a Software Collection, use:
$ scl enable collection 'command'
Replace collection with the name of the Software Collection.
For more information, see Using GCC Toolset.
4.5. Commands for installing RHEL 8 content
The following are the commonly used commands for installing Red Hat Enterprise Linux 8 content.
| Command | Description |
|---|---|
|
| Install a package.
If the package is provided by a module stream, |
|
| Enable a module by using a specific stream. Always consider the module stream’s life cycle. |
|
| Install a module by using a specific stream and default profiles |
|
| Install a module by using a specific stream and profile. |
4.6. Additional resources
- Installing software packages with yum
-
yum(8)man page
