# Red Hat Enterprise Linux 9

## Hardware Compatibility
- [Hardware Compatibility](hardware_compatibility.md)

## Alpha Testing

We encourage you to install RHEL9 on testing systems and tell us what we may have broken, what bugs you run into and what features you are missing. Please be aware of certain things we changed on how we want the base operating system to work, listed below.

Bugs and issues can be reported in the [Linux Issues project](https://git.psi.ch/linux-infra/issues).

Additional ressource [Considerations in adopting RHEL 9](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/considerations_in_adopting_rhel_9/index#doc-wrapper)


## Install Documentation
* [Installation Documentation](../basic_installation.md)

## Changes for Base Installation

### No Support for AFS
The future support model for AFS or the service and functionality it provides is currently under consideration. Consequently it has been decided not to support AFS in the PSI RHEL9 distribution at the time being.


### Network Configuration
By default the network configuration is handed over to NetworkManager which does automatic configuation.

If you wish different behaviour, e.g. for static IP addresses, please check out the [Network Configuration guide](../../configuration/basic/networking.md).


### Disk Layout
Provided disk size is 64GB for virtual machines.

| Name | Path | Size | Type | LVM |
| ---  | ---  | ---  | ---  | --- |
| root | /    | 16GB | xfs  | yes |
| home | /home | 2GB | xfs  | yes |
| tmp  | /tmp  | 2GB | xfs  | yes |
| var  | /var  | 16GB | xfs | yes |
| log | /var/log | 4GB | xfs | yes |
| boot | /boot | 1GB | ext4 | no |
| swap | - | 4GB | swap | no |


### Workstation Package Groups
Changed the ammount of packages installed by default on workstation installation. See the comparison below:

| RHEL 7&8 | RHEL 9 |
| ---      | ---    |
| <ul><li>VMware platform specific packages (platform-vmware)</li><li> Container Management (container-management)</li><li> Internet Browser (internet-browser)</li><li> GNOME (gnome-desktop)</li><li> Headless Management (headless-management)</li><li> Server product core (server-product)</li><li> Hardware Monitoring Utilities (hardware-monitoring)</li><li> base-x (base-x)</li><li> core (core)</li><li> fonts (fonts)</li><li> guest-desktop-agents (guest-desktop-agents)</li><li> hardware-support (hardware-support)</li><li> input-methods (input-methods)</li><li> multimedia (multimedia)</li><li> networkmanager-submodules (networkmanager-submodules)</li><li> print-client (print-client)</li><li> standard (standard)</li></ul> | <ul><li>Internet Browser</li><li>VMware platform specific packages (platform-vmware)</li><li>GNOME (gnome-desktop)</li><li>Core (core)</li><li> fonts (fonts)</li><li> multimedia (multimedia)</li><li> office-suite (office-suite)</li><li> print-client (print-client)</li></ul> |


## Caveats

### Missing or Replaced Packages

[List of packages removed in RHEL 9](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/considerations_in_adopting_rhel_9/index#removed-packages_assembly_changes-to-packages)

| RHEL 8 | RHEL 9 | Remarks |
| ---    | ---    | ---     |
| `mailx`   | `s-nail` | S-nail is MIME capable and has extensions for line editing, S/MIME, SMTP, IMAP, POP3, and more.    |
| `platform-python, python2 (python27:2.7), python36 (python36:3.6), python38 (python38:3.8), python39 (python39:3.9)` | `python3` | As for all python* packages |
| `pulseaudio` | `pipewire-pulseaudio` | The pulseaudio server implementation has been replaced by the pipewire-pulseaudio implementation. Note that only the server implementation has been switched. The pulseaudio client libraries are still in use. |
| `inkscape1` | `inkscape` | Also affects `inkscape-docs` and `inkscape-view` |