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SUSE Liberty Linux

Registering RHEL 8 or CentOS Linux 8

This guide describes how to use SUSE Liberty Linux to update Red Hat Enterprise Linux 8 or CentOS Linux 8.

Publication Date: May 20, 2022

Copyright © 2022–2022 SUSE LLC and contributors. All rights reserved.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or (at your option) version 1.3; with the Invariant Section being this copyright notice and license. A copy of the license version 1.2 is included in the section entitled GNU Free Documentation License.

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All information found in this book has been compiled with utmost attention to detail. However, this does not guarantee complete accuracy. Neither SUSE LLC, its affiliates, the authors nor the translators shall be held liable for possible errors or the consequences thereof.

1 Introduction

SUSE Liberty Linux is a technology and support solution for mixed Linux environments. With a SUSE Liberty Linux subscription, you can register and receive updates for Red Hat Enterprise Linux, CentOS Linux, and SUSE Linux Enterprise Server. An optional High Availability extension is also available.

Important

CentOS Stream is not supported.

To register Red Hat Enterprise Linux 8 or CentOS Linux 8, use SUSE's Repository Mirroring Tool (RMT). RMT is a proxy system for the SUSE Customer Center. The RMT server is registered with the SUSE Customer Center, and other systems in the network are registered with the RMT server and receive packages from it directly.

Registering RHEL or CentOS Linux with RMT involves the following steps:

  1. Section 2, “Requirements”. Make sure you have everything required for the following procedures.

  2. Section 3, “Configuring the RMT server”. This server must be installed on SUSE Linux Enterprise Server 15. You can skip this step if you already have an RMT server in your network.

  3. Section 4, “Mirroring SUSE Liberty Linux repositories with RMT”. You can skip this step if SUSE Liberty Linux is already enabled and mirrored on your RMT server.

  4. Section 5, “Registering RHEL or CentOS Linux with RMT”. RMT includes a setup script to automate the registration process.

Note
Note: SUSE Liberty Linux and SUSE Linux Enterprise Server with Expanded Support

SUSE Liberty Linux now provides what used to be covered by the SUSE Linux Enterprise Server with Expanded Support subscription. Some components might still use the Expanded Support name during the transition period.

2 Requirements

  • You have a SUSE Liberty Linux subscription.

  • You have a SUSE Customer Center account.

  • The systems you want to register have been updated to the latest version of RHEL 8 or CentOS Linux 8.

  • SUSE Linux Enterprise Server (SLES) 15 is installed and running in the same network as the systems you want to register. You can use the SUSE Liberty Linux subscription to register the SLES server. To install the latest version of SLES 15, see the Installation Quick Start.

  • The SLES server has enough storage available for repository mirroring. Downloaded packages are stored in /usr/share/rmt/public/repo, which is a symbolic link to /var/lib/rmt/public/repo/. The amount of storage required depends on the number of repositories that you mirror.

    We recommend at least 1.5 times the total size of all enabled repositories. For RHEL 8 or CentOS Linux 8, this means approximately 150 GB for the default repositories, and an additional 735 GB if you need the src and debug repositories. However, be aware that these repositories will grow over time.

3 Configuring the RMT server

Use this procedure to configure the Repository Mirroring Tool (RMT) on SUSE Linux Enterprise Server 15.

Prerequisites
  • SUSE Linux Enterprise Server 15 is installed and up to date.

  • You have a SUSE Customer Center account and organization credentials.

Procedure 1: Configuring the RMT server
  1. Install RMT on SUSE Linux Enterprise Server 15:

    # zypper in rmt-server
  2. Start the rmt module in YaST:

    # yast2 rmt
  3. Enter your Organization Credentials, then select Next.

    Tip

    To find your organization credentials, log in to the SUSE Customer Center, select your organization from My Organizations, and click Proxies. Your organization's Mirroring credentials are in the top right corner.

  4. Enter Database Credentials for a new MariaDB database user, then select Next. The new user is created.

  5. If a password for the MariaDB root user is already set, enter the password when prompted, then select OK.

    If no password is set for the MariaDB root user, enter and confirm a new password when prompted, then select OK.

  6. Enter a Common Name for the SSL certificates. The common name is usually the FQDN of the server.

  7. If the server has other domain names or IP addresses, enter these as Alternative common names. Select Add to add new names. When all common names are entered, select Next.

  8. If prompted, enter and confirm a password for the CA private key, then select OK.

  9. Activate the check box Open Ports for HTTP and HTTPS in Firewall, then select Next.

  10. YaST displays the RMT Service Status. Select Next.

  11. Review the Configuration Summary, then select Finish to close YaST.

YaST enables and starts all RMT systemd services and timers.

4 Mirroring SUSE Liberty Linux repositories with RMT

Use this procedure to mirror the SUSE Liberty Linux repositories for Red Hat Enterprise Linux 8 and CentOS Linux 8.

Prerequisites
  • Section 3, “Configuring the RMT server”

  • The RMT server has enough storage available for repository mirroring.

  • Your organization credentials appear correctly in /etc/rmt.conf.

  • You have a SUSE Liberty Linux subscription activated in the SUSE Customer Center.

Procedure 2: Mirroring SUSE Liberty Linux repositories with RMT
  1. On the RMT server, update the available product and repository metadata:

    # rmt-cli sync

    Synchronization is also performed automatically by rmt-server-sync.timer. You can check the status and the next scheduled sync time with the following command:

    # systemctl status rmt-server-sync.timer
  2. Enable SUSE Liberty Linux using the product ID 1921:

    # rmt-cli product enable 1921
    Found product by target 1921: SUSE Linux Enterprise Server with Expanded Support 8 x86_64.
    Enabling SUSE Linux Enterprise Server with Expanded Support 8 x86_64:
      SUSE Linux Enterprise Server with Expanded Support 8 x86_64:
        Enabled repository RES-8-Updates.
        Enabled repository RES-AS-8-Updates.
        Enabled repository RES-CB-8-Updates.

    This enables all of the default repositories associated with the product.

  3. If your subscription includes the High Availability extension, enable the extension using the product ID 1922:

    # rmt-cli product enable 1922
    Found product by target 1922: SUSE Linux Enterprise High Availability Extension with Expanded Support 8 x86_64.
    Enabling SUSE Linux Enterprise High Availability Extension with Expanded Support 8 x86_64:
      SUSE Linux Enterprise High Availability Extension with Expanded Support 8 x86_64:
        Enabled repository RES-8-HA-Updates.
    Tip

    To check whether the High Availability extension is available, run this command: rmt-cli products list --all --name="Expanded Support" --version=8

  4. If you also need the Source or Debug repositories, find and enable them with the following commands:

    # rmt-cli repo list --all | grep RES-
    # rmt-cli repo enable REPO_ID
  5. Start package mirroring for the enabled repositories:

    # rmt-cli mirror

    Packages are downloaded to the RMT server once per day by rmt-server-mirror.timer. You can check the status and the next scheduled download time with the following command:

    # systemctl status rmt-server-mirror.timer

5 Registering RHEL or CentOS Linux with RMT

Use this procedure to register Red Hat Enterprise Linux 8 or CentOS Linux 8 with the RMT server.

Important

CentOS Stream is not supported.

Prerequisites
Procedure 3: Registering RHEL or CentOS Linux with RMT
  1. Disable the RHEL or CentOS repositories in /etc/yum.repos.d by setting enabled=0 in each .repo file.

  2. Download the rmt-client-setup-res script:

    # curl http://RMT_SERVER/tools/rmt-client-setup-res --output rmt-client-setup-res
  3. Run the rmt-client-setup-res script with the URL of the RMT server as a parameter:

    # sh rmt-client-setup-res https://RMT_SERVER

    The script performs the following tasks:

    • Installs SUSEConnect and its dependencies.

    • Downloads and runs the rmt-client-setup script, which does the following:

      • Downloads all keys from http://RMT_SERVER/repo/keys.

      • Imports the keys with gpg --import and rpm --import.

      • Downloads the CA certificate from https://RMT_SERVER/rmt.crt.

      • Imports the CA certificate to the trust store.

      • Uses SUSEConnect to register the system with the RMT server. Registering the system using SUSEConnect adds and enables all default repositories.

    If the script works, you will see Successfully registered system. If the script fails, see Section 6, “Troubleshooting” for potential solutions.

  4. Verify the installed product:

    # SUSEConnect --status-text

    You should see the following output:

    Installed Products:
    ------------------------------------------
    
      SLES Expanded Support platform release file
      (RES/8/x86_64)
    
      Registered
    
    ------------------------------------------
  5. Verify the available repositories:

    # dnf repolist

    You should see RES-8-Updates, RES-AS-8-Updates, and RES-CB-8-Updates.

  6. If your subscription includes the High Availability extension, activate it with the following command:

    # SUSEConnect –p RES-HA/8/x86_64
    Tip

    To check whether the extension is available, run the SUSEConnect --list-extensions command.

  7. Run the update command to make sure there are no errors:

    # dnf update

You can now update your system from repositories provided by SUSE Liberty Linux.

6 Troubleshooting

nginx.service is inactive after installing the rmt-server package

Continue the procedure to configure RMT in YaST. This often resolves the issue. If that fails, Apache might be installed on your server, and must be disabled. Apache conflicts with NGINX because both web servers listen on port 80.

SUSE Liberty Linux doesn't appear in rmt-cli products list after rmt-cli sync

Check your network. If the network is down, the sync command fails without showing an error.

Mirroring completes with errors

If some packages could not be downloaded due to timeouts, rerun the rmt-cli mirror command until all packages are downloaded.

Setup script cannot access the SUSE Liberty Linux repository

The repodata directory on the RMT server will not be available until all of the packages for that repository are downloaded. If some packages could not be downloaded to the RMT server due to timeouts during the first mirroring, rerun the rmt-cli mirror command until all packages are downloaded.

Setup script cannot remove the protected package redhat-release

On RHEL, the redhat-release package is protected as a dependency of the setup package. If necessary, you can use the following command to remove redhat-release without checking for dependencies:

# rpm -e redhat-release --nodeps
Setup script cannot install sles_es-release because of package conflicts

If sles_es-release conflicts with existing packages, try the following workaround:

  1. Remove the redhat-release directory:

    # rm -r /usr/share/redhat-release

    On CentOS, this removes the symbolic link between redhat-release and centos-release.

  2. Edit the rmt-client-setup-res script to add --allowerasing to the following line:

    $DNF install ${AUTOACCEPT} SUSEConnect sles_es-release librepo-1.9.2 --allowerasing
Setup script cannot install SUSEConnect because of package dependencies

SUSE Liberty Linux only supports the latest version of RHEL or CentOS Linux. If your system is running the latest version and SUSEConnect still has package dependency issues, try the following workaround:

  1. Edit the rmt-client-setup-res script to add --skip-broken to the following line:

    $DNF install ${AUTOACCEPT} SUSEConnect sles_es-release librepo-1.9.2 --skip-broken
  2. Run the script and accept any proposed package changes. SUSEConnect will be skipped.

  3. Run the script a second time. The package changes from the first attempt can sometimes resolve the package dependency issues, allowing the second attempt to successfully install SUSEConnect.