Upgrade OS: RHEL 7 to RHEL 8#

Important

Instructions here are provided here on a best effort basis, and without warranty.

For authoritative documentation to upgrade RHEL 7 to RHEL 8, refer to the official Red Hat documentation

Tip

This guide does not contain instructions for offline upgrades. Instead, see the official documentation:

This section provides instructions on how to upgrade RHEL 7 to RHEL 8.

Requirements#

Familiarity with the terminal
Root access to the RHEL host.
Red Hat Enterprise Linux Server subscription or similar.

Prepare RHEL 7 host for upgrade#

Prepare your RHEL 7 host for upgrade by following these steps. In the terminal, run as root:

Disable SELinux for the period of the upgrade.:
```
setenforce 0
```
Make sure that you are registered through subscription-manager:
```
subscription-manager list --installed
```

Make sure that you have the following repositories enabled:

subscription-manager repos --enable rhel-7-server-rpms             // Enable the Base repository:
subscription-manager repos --enable rhel-7-server-extras-rpms      // Enable the Extras repository where Leapp and its dependencies are available
subscription-manager release --unset                               // Set the Red Hat Subscription Manager to use the latest RHEL 7 content

(Optional) Make sure versionlock is cleared if you use yum-plugin-versionlock:
```
yum versionlock clear
```
Update all installed packages:
```
yum update -y
```
Restart the host:
```
reboot
```

Install Leapp:

yum install -y leapp leapp-repository leapp-upgrade

Perform the upgrade#

Run as root:

The Leapp upgrade command:
```
leapp upgrade --target <target_os_version>
```
For available <target_os_version> values, see Red Hat: Upgrading from RHEL 7 to RHEL 8: Supported upgrade paths
Once complete, reboot the system. Run as root:
```
reboot
```