Goal	Download, install, update, and manage software packages from Red Hat and DNF package repositories.
Objectives	Register a system to your Red Hat account and assign it entitlements for software updates and support services with Red Hat Subscription Management. Explain how software is provided as RPM packages, and investigate the DNF and RPM installed system packages. Find, install, and update software packages with the `dnf` command. Enable and disable server use of Red Hat or third-party DNF repositories.
Sections	Register Systems for Red Hat Support (and Quiz) Explain and Investigate RPM Software Packages (and Guided Exercise) Install and Update Software Packages with DNF (and Guided Exercise) Enable DNF Software Repositories (and Guided Exercise)
Lab	Install and Update Software Packages

Register Systems for Red Hat Support

Objectives

Register a system to your Red Hat account and assign it entitlements for software updates and support services with Red Hat Subscription Management.

Red Hat Subscription Management

Red Hat Subscription Management provides tools to entitle machines to product subscriptions, for administrators to get updates to software packages and to track information about support contracts and subscriptions that the systems use. Standard tools such as the dnf command obtain software packages and updates through a content distribution network that the Red Hat Content Delivery Network provides.

You can perform the following main tasks with the Red Hat Subscription Management tools:

Register a system to associate it with the Red Hat account with an active subscription. With the Subscription Manager, the system can register uniquely in the subscription service inventory. You can unregister the system when it is not in use.
Subscribe a system to entitle it to updates for the selected Red Hat products. Subscriptions have specific levels of support, expiration dates, and default repositories. The tools help to either auto-attach or select a specific entitlement.
Enable repositories to provide software packages. By default, each subscription enables multiple repositories; other repositories such as updates or source code are enabled or disabled. A repository is a central location for storing and maintaining software packages.
Review and track available or consumed entitlements. In the Red Hat Customer Portal, you might view the subscription information locally on a specific system or for a Red Hat account.

Simple Content Access

Simple Content Access (SCA) is a Red Hat subscription management capability. When you enable SCA for your organization, the entitlement process is simplified. SCA eliminates the requirement to attach subscriptions at a per-system level. You register your systems, enable the repositories that each system needs, and begin installing software packages.

Simple Content Access is an optional feature of Red Hat Satellite Server and Red Hat Subscription Management. This course includes the subscription commands, as needed, if you have not yet enabled SCA.

Subscribe a System with Red Hat Subscription Manager

Different options exist to register a system with the Red Hat Customer Portal. For example, you can access a graphical interface by using a GNOME application or through the RHEL web console, or you can register your system by using a command-line tool.

To register a system by using a GNOME application, launch the Red Hat Subscription Manager application from the Activities menu. Type subscription in the Type to search field and click the Red Hat Subscription Manager application. When prompted, enter the appropriate password to authenticate. In the Subscriptions window, click Register to open the Register System dialog box.

Figure 12.1: The Register System dialog box

By default, systems register to the Red Hat Customer Portal. Provide the login and the password for your Red Hat Customer Portal account and click Register to register the system. When registered, the system automatically attaches an available subscription.

Close the Subscriptions window after registering and assigning the system to a subscription. The system is now subscribed and ready to receive updates or to install new software according to the subscription that is attached to the Red Hat Content Delivery Network.

Subscribe a System with the RHEL Web Console

To register a system with the web console, you must log in as a privileged user. Click Subscriptions and then click Register:

Figure 12.2: Web console subscriptions

The Register System dialog box in the web console is similar to the GNOME application. Provide the login and the password for your Red Hat Customer Portal account and click Register to register the system. You can then install new software or update your system, according to its attached subscription.

Subscribe a System with the Command Line

Use the subscription-manager command to register a system without using a graphical environment. The subscription-manager command automatically attaches a system to the best-matched compatible subscriptions for the system.

[root@host ~]# subscription-manager register --username <yourusername>
Registering to: subscription.rhsm.redhat.com:443/subscription
Password: yourpassword
The system has been registered with ID: 1457f7e9-f37e-4e93-960a-c94fe08e1b4f
The registered system name is: host.example.com

View available subscriptions for your Red Hat account:

[root@host ~]# subscription-manager list --available
-------------------------------------------
    Available Subscriptions
-------------------------------------------
...output omitted...

Auto-attach a subscription:

[root@host ~]# subscription-manager attach --auto
...output omitted...

Alternatively, attach a subscription from a specific pool from the list of available subscriptions:

[root@host ~]# subscription-manager attach --pool=poolID
...output omitted...

View consumed subscriptions:

[root@host ~]# subscription-manager list --consumed
...output omitted...

Unregister a system:

[root@host ~]# subscription-manager unregister
Unregistering from: subscription.rhsm.redhat.com:443/subscription
System has been unregistered.

Activation Keys

An activation key is a preconfigured subscription management file that is available for use with both Red Hat Satellite Server and subscription management through the Red Hat Customer Portal. Use the subscription-manager command with activation keys to simplify the registration and assignment of predefined subscriptions. This method of registration is beneficial for automating installations and deployments. For organizations that enable Simple Content Access, activation keys can register systems and enable repositories without needing to attach subscriptions.

Entitlement Certificates

Digital certificates store current entitlement information on the local system. The registered system stores the entitlement certificates under the /etc/pki directory.

/etc/pki/product certificates indicate installed Red Hat products.
/etc/pki/consumer certificates identify the Red Hat account for registration.
/etc/pki/entitlement certificates indicate which subscriptions are attached.

The rct command inspects the certificates, and the subscription-manager command examines the attached subscriptions on the system.

References

subscription-manager(8) and rct(8) man pages

For further information, refer to Registering the System and Managing Subscriptions at https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/configuring_basic_system_settings/assembly_registering-the-system-and-managing-subscriptions_configuring-basic-system-settings

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Red Hat System Administration I (RH124)

Haley_Ruccio

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The first of two courses covering the core system administration tasks needed to manage Red Hat Enterprise Linux serversRed Hat System Administration I (RH124) is designed for IT professionals without previous Linux system administration experience. The course provides students with Linux administration competence by focusing on core administration tasks. This course also provides a foundation for students who plan to become full-time Linux system administrators by introducing key command-line concepts and enterprise-level tools. This course is the first of a two-course series that takes a computer professional without Linux system administration knowledge to become a fully capable Linux administrator. These concepts are further developed in the follow-on course, Red Hat System Administration II (RH134).This course is based on Red Hat® Enterprise Linux 9.0.Course content summaryIntroduce Linux and the Red Hat Enterprise Linux ecosystem.Run commands and view shell environments.Manage, organize, and secure files.Manage users, groups and user security policies.Control and monitor systemd services.Configure remote access using the web console and SSH.Configure network interfaces and settings.Manage software using DNFAudience for this courseThe primary persona is a technical professional with current or pending responsibilities as a Linux enterprise or cloud system administrator.This course is popular in Red Hat Academy, and is targeted at the student who is planning to become a technical professional using Linux.Prerequisites for this courseBasic technical user skills with computer applications on some operating systems are expected.Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technical requirements for this course.This course is not designed for bring your own device (BYOD).Internet access is not required but is recommended so that students can research and browse Red Hat online resources.

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