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SUSE Multi-Linux Support

Registering RHEL 8 or CentOS Linux 8 with RMT

Publication Date: December 12, 2024

This guide explains how to register and update RHEL 8 or CentOS Linux 8 with Repository Mirroring Tool (RMT).

To register with SUSE Manager, see Registering RHEL 8 or CentOS Linux 8 with SUSE Manager.

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1 Introduction

SUSE Multi-Linux Support is a technology and support solution for mixed Linux environments. With a SUSE Multi-Linux Support subscription, you can register and update Red Hat Enterprise Linux and CentOS Linux. An optional High Availability extension is also available.

The following table shows which Linux distributions are supported by each subscription. These subscriptions also include an entitlement for a registration tool to manage package updates.

Table 1: Supported distributions and registration options
SubscriptionSupported distributionsRegistration options

SUSE Multi-Linux Support Enterprise

CentOS Linux

Red Hat Enterprise Linux

SUSE Linux Enterprise Server

SUSE Manager

Repository Mirroring Tool

SUSE Multi-Linux Support Professional

CentOS Linux

Red Hat Enterprise Linux

SUSE Manager

Repository Mirroring Tool

SUSE Multi-Linux Support Basic

CentOS Linux

SUSE Manager

Repository Mirroring Tool

SUSE Multi-Linux Support Lite

CentOS Linux

Includes one entitlement for SLES to host RMT

Repository Mirroring Tool

Important

CentOS Stream is not supported.

Important

Registering RHEL or CentOS Linux directly with SUSE Customer Center is not currently supported.

This guide describes how to register with Repository Mirroring Tool (RMT). RMT is a proxy system for SUSE Customer Center. The RMT server is registered with SUSE Customer Center, and other systems are registered with the RMT server and receive packages from it directly.

To register with SUSE Manager, see Registering RHEL 8 or CentOS Linux 8 with SUSE Manager.

Procedure overview
Note
Note: SUSE Multi-Linux Support and SUSE Liberty Linux or Expanded Support

SUSE Multi-Linux Support was previously named SUSE Liberty Linux and SUSE Linux Enterprise Server with Expanded Support. During the transition period, some components might still use one of these names.

2 Installing a virtual machine to host RMT

Use this procedure to install a SLES Minimal VM, a preconfigured virtual machine image that contains a slimmed-down version of SUSE Linux Enterprise Server (SLES). This machine will be the Repository Mirroring Tool (RMT) server.

You can use your SUSE Multi-Linux Support subscription to register this machine.

Tip
Tip: Other installation options

To install a full SLES machine on bare metal, see Installation Quick Start.

To deploy SLES in the public cloud, see Deploying a SUSE Linux Enterprise Server instance to support RMT in the public cloud in Repository Mirroring Tool Guide.

Requirements
  • You have a SUSE Multi-Linux Support subscription.

  • You have a SUSE Customer Center account.

  • The VM must have a static IP address and host name. This guide includes steps for configuring the VM's network setup, but you must have basic networking knowledge to fill in the details.

  • You have the infrastructure to run virtual machines. This guide explains how to set up the VM to host RMT, but does not describe how to use different virtualization products. See the relevant documentation for your product.

  • The RMT server needs enough available disk space to mirror the SUSE Multi-Linux Support 8 repositories. Downloaded packages are stored in /var/lib/rmt/public/repo/. The amount of storage required depends on the number of repositories you mirror. We recommend at least 1.5 times the total size of all enabled repositories.

    Important
    Important: SUSE Multi-Linux Support 8 repository size

    The SUSE Multi-Linux Support 8 repositories will grow over time because older package versions are not removed. Based on the current[1] size of the repositories, to meet the 1.5 times size recommendation you will need approximately 515 GB of disk space for the default repositories.

    If you need the optional Source and Debug repositories, you will need an additional 1365 GB available.

Procedure 1: Installing a virtual machine to host RMT
  1. Download the appropriate Minimal-VM image for your virtualization infrastructure from https://www.suse.com/download/sles/.

  2. Use the Minimal-VM image to start the virtual machine.

    The default disk size for SLES Minimal VM is 24 GB. If you can customize the configuration before the installation begins, increase the available storage so there is enough disk space for repository mirroring.

  3. When the JeOS Firstboot screen appears, select Start.

  4. Choose your keyboard layout and select OK.

  5. Review the End User License Agreement and select EXIT. To agree with the terms of the license, select Yes.

  6. Choose your time zone and select OK.

  7. Enter a root password and select OK, then confirm the password and select OK again.

  8. JeOS Firstboot shows the command to use to register this VM. You do not need to write this down; the command is explained in this procedure. Select OK.

  9. When the VM is ready, log in as the root user with the password you entered during setup.

  10. Register the VM using your SUSE Customer Center email address and the registration code for SUSE Multi-Linux Support:

    # SUSEConnect -e EMAIL_ADDRESS -r REGISTRATION_CODE

    This activates the Basesystem, Server Applications, and Python 3 modules.

  11. If you did not already increase the VM's disk space before the installation began, increase it now. You might need to shut down the VM to do so. The VM must have enough space to mirror the SUSE Multi-Linux Support 8 repositories.

You must also configure a static IP address and host name for the VM. If you are familiar with any networking tools in SLES, configure the network with your preferred tool. If not, use the YaST graphical interface:

Procedure 2: Setting a static IP address in YaST
  1. Install YaST and the YaST network module:

    # zypper install yast2 yast2-network
  2. Start the YaST network module:

    # yast2 lan
  3. In the Overview tab, select Edit to change the settings of the eth0 device. The Network Card Setup dialog opens.

  4. In the Address tab, activate Statically Assigned IP Address.

  5. Fill in the IP Address, Subnet Mask, and Hostname fields.

  6. Select Next.

  7. Switch to the Hostname/DNS tab and fill in the Static Hostname field.

  8. Change Set Hostname via DHCP to no.

  9. Fill in at least one Name Server field.

  10. Switch to the Routing tab and select Add. A new dialog opens.

  11. Fill in the Gateway field. Make sure to remove the - character.

  12. From the Device drop-down list, select eth0.

  13. Select OK to close the dialog.

  14. Select OK to complete the configuration and close YaST.

  15. Check the network settings:

    # ip addr

    Check that the network interface can access external networks:

    # ping www.suse.com

    Cancel the ping with CtrlC.

You can now install RMT on the virtual machine.

3 Configuring the RMT server

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

Requirements
Procedure 3: Configuring the RMT server
  1. On the SLES machine, install RMT:

    # zypper in rmt-server
  2. Install the following packages, which are not installed by default on a SLES Minimal VM:

    # zypper install yast2-rmt mariadb nginx
  3. Start the YaST rmt:

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

    Tip

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

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

  6. When prompted, enter and confirm a new password for the MariaDB root user, then select OK.

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

  8. 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.

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

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

  11. YaST displays the RMT Service Status. If there are no issues, select Next.

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

YaST enables and starts all RMT systemd services and timers.

4 Mirroring SUSE Multi-Linux Support repositories with RMT

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

Requirements
  • The RMT server is installed and up to date.

  • The RMT server has enough storage available for repository mirroring. The amount of storage required depends on the number of repositories you mirror. We recommend at least 1.5 times the total size of all enabled repositories. Be aware that the SUSE Multi-Linux Support repositories will grow substantially over time.

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

  • You have a SUSE Multi-Linux Support subscription activated in SUSE Customer Center.

Procedure 4: Mirroring the SUSE Multi-Linux Support 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 synchronization time with the following command:

    # systemctl status rmt-server-sync.timer
  2. Enable SUSE Multi-Linux Support 8 using the product ID 1921:

    # rmt-cli products enable 1921

    This enables all 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 products enable 1922
    Tip

    To check whether the High Availability extension is available, run this command: rmt-cli products list --all --name=RES-HA

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

    • RES-8-Source-Updates, RES-AS-8-Source-Updates and RES-CB-8-Source-Updates:

      # rmt-cli repos enable 3879 3922 3925
    • RES-8-Debug-Updates, RES-AS-8-Debug-Updates and RES-CB-8-Debug-Updates:

      # rmt-cli repos enable 3881 3923 3926
    • RES-8-HA-Source-Updates and RES-8-HA-Debug-Updates:

      # rmt-cli repos enable 3883 3884
  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.

Requirements
  • The RMT server is running rmt-server version 2.10 or later.

  • The SUSE Multi-Linux Support 8 repositories are available on the RMT server.

  • The system you want to register can access the RMT server.

  • The system you want to register is up to date. SUSE Multi-Linux Support only supports the latest minor release of RHEL 8 or CentOS Linux 8.

  • You have a SUSE Multi-Linux Support subscription activated in SUSE Customer Center.

  • You have removed the system from any Red Hat subscription services it was registered to.

Procedure 5: Registering RHEL or CentOS Linux with RMT
  1. Download the rmt-client-setup-res script:

    # curl http://RMT_SERVER/tools/rmt-client-setup-res --output rmt-client-setup-res
  2. 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 installs SUSEConnect and its dependencies, then downloads and runs the rmt-client-setup script, which performs the following tasks:

    • 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.

    You should see Successfully registered system.

  3. Verify the installed product:

    # SUSEConnect --status-text

    You should see the following output:

    Installed Products:
    ------------------------------------------
    
      SUSE Liberty Linux release file
      (RES/8/x86_64)
    
      Registered
    
    ------------------------------------------
  4. 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.

  5. Verify the available repositories:

    # dnf repolist all

    The default repositories RES-8-Updates, RES-AS-8-Updates and RES-CB-8-Updates should be enabled. If you activated the High Availability extension, RES-8-HA-Updates should also be enabled.

    You will also see optional Source and Debug repositories with the status disabled. Be aware that these repositories are listed even if they are not mirrored on the RMT server. You can check the mirrored repositories by browsing the directory listing at https://RMT_SERVER/repo/SUSE/Updates/ or by logging in to the RMT server and running rmt-cli repos list.

  6. If you need the Source or Debug repositories, enable them with the following command:

    # dnf config-manager --enable REPO_ID
  7. Run the update command to make sure there are no errors:

    # dnf update

You can now keep your system up to date from repositories provided by SUSE Multi-Linux Support.

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 Multi-Linux Support does not appear in rmt-cli products list after rmt-cli sync

Check your network. If the network is down, rmt-cli sync fails without showing an error.

Mirroring completes with errors

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

Setup script cannot access the SUSE Multi-Linux Support 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 because of timeouts during the first mirroring, rerun the rmt-cli mirror command until all packages are downloaded.

Setup script cannot install SUSEConnect because of package dependencies

SUSE Multi-Linux Support only supports the latest minor release 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 SUSEConnect librepo --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.

dnf update fails with Errors during downloading metadata for repository — Status code: 404

The repository shown in the error message might not be mirrored on the RMT server. The optional Source and Debug repositories can be enabled with dnf config-manager even if they are not available from RMT.

  1. Run dnf repolist all to show the status of the repositories.

  2. If the repository shown in the error message has the status enabled, disable it with the following command:

    # dnf config-manager --disable REPO_ID
  3. Run dnf update again to see if the issue is resolved.

  4. If you need the unavailable repository for your system, see Section 4, “Mirroring SUSE Multi-Linux Support repositories with RMT”.



[1] As of 21 October, 2024