Installing the Oracle Preinstallation RPM with ULN Support

Use this procedure to subscribe to Unbreakable Linux Network (ULN) Oracle Linux channels for your Oracle software.

To obtain Unbreakable Linux Network (ULN) support, subscribe to Oracle Linux channels, and to add the Oracle Linux channel that distributes the Oracle Preinstallation RPM:

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.
Log in to Unbreakable Linux Network:
```
https://linux.oracle.com
```
Start a terminal session and enter the following command as root, depending on your platform. For example:
- Oracle Linux 7 and Oracle Linux 8:
```
# 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 a standard (not role-allocated) Oracle installation owner and groups, and sets up other kernel configuration settings as required for Oracle installations.
Check the RPM log file to review the system configuration changes. For example:
```
/var/log/oracle-database-preinstall-19c/backup/timestamp/orakernel.log
```
Repeat steps 1 through 4 on all other servers in your cluster.

Parent topic: Preparing to Upgrade Oracle Restart