Use this procedure to subscribe to Oracle Linux channels, and to add the Oracle Linux channel that distributes the Oracle Preinstallation RPM.

1. Complete a default Oracle Linux workstation installation.
   You can download Oracle Linux from the Oracle Software Delivery Cloud:
   https://edelivery.oracle.com/linux
2. Register your server with Unbreakable Linux Network (ULN). By default, you are registered for the Oracle Linux Latest channel for your operating system and hardware.
3. Log in to Unbreakable Linux Network:
   https://linux.oracle.com
4. Click the Systems tab, and in the System Profiles list, select a registered server. The System Details window opens and displays the subscriptions for the server.
5. Click Manage Subscriptions to open the System Summary window.
6. From the Available Channels list, select the Latest and update patch channels corresponding to your Oracle Linux distribution. For example, if your distribution is Oracle Linux 7 for x86_64, then select Oracle Linux 7 Latest (x86_64).
7. Click Subscribe.
8. Start a terminal session and enter the following command as root, depending on your platform. For example:
   • Oracle Linux 7:

     # yum install oracle-database-preinstall-19c

     Note:

     Use the -y option if you want yum to skip the package confirmation prompt.

   You should see output indicating that you have subscribed to the Oracle Linux channel, and that packages are being installed.

   Oracle Linux automatically creates standard (not role-allocated) Oracle installation owner and groups, and sets up other kernel configuration settings as required for Oracle installations.
9. Enter the following command as root to update the sysctl.conf settings:

   # sysctl -p

   Note:

   The RPM packages set the Oracle software user to oracle by default. Before installing Oracle Database, you can update the Oracle user name in the /etc/security/limits.d/oracle-database-preinstall-19c.conf file and other configuration files.
10. Check the RPM log file to review the system configuration changes. For example, on Oracle Linux 7:

    /var/log/oracle-database-preinstall-19c/backup/timestamp/orakernel.log

    Repeat these steps on all other servers in your cluster.