Streamlined and validated the installation instructions.

        * Tested on Alma 9.x, Centos 9 Stream and RHEL 9.x
        * Removed notes about bugs that were fixed quite some time ago
        * Removed EL8 notes
        * Added details on how to use the nightly builds as there hasn't been a
          release for some time.
        * Added author (gocallag)

Author: gocallag

data/authors.yml

@@ -2851,3 +2851,8 @@ jasperb:
   name: Jasper Berton
   email: jasper.berton@team.blue
   gravatar: 134267a37e4981c3c0a94dcaddc88357
+
+gocallag:
+  name: Geoff O'Callaghan
+  email: geoffocallaghan@gmail.com
+  gravatar: 5c7bb690a7f4520b632e70fac7bb9396

source/download/install_on_rhel.md

@@ -2,106 +2,32 @@
 title: Installing on RHEL
 authors:
   - sandrobonazzola
+  - gocallag
 page_classes: download
 ---
 
-# Installing on RHEL or derivatives
-## Installing on RHEL 8.6 or derivatives
+# Installing on RHEL 9.x or derivatives
 
-In order to install oVirt 4.5 on RHEL 8.6 or derivatives you'll need to provide CentOS Stream required configuration.
-The following bash code is needed before starting to install oVirt 4.5 on top of RHEL 8.6
+## For RHEL 9.x
 
-Specific to RHEL only:
-```bash
-subscription-manager repos --enable rhel-8-for-x86_64-baseos-rpms
-subscription-manager repos --enable rhel-8-for-x86_64-appstream-rpms
-subscription-manager repos --enable codeready-builder-for-rhel-8-x86_64-rpms
-
-rpm -i --justdb --nodeps --force "https://vault.centos.org/centos/8-stream/BaseOS/$(rpm --eval '%_arch')/os/Packages/centos-stream-release-8.6-1.el8.noarch.rpm"
-```
-
-Specific to Rocky Linux only:
-```bash
-# On Rocky there's an issue with centos-release-nfv package from extras
-dnf install -y dnf-plugins-core
-dnf config-manager --set-disabled extras
-```
-
-Common to RHEL 8.6 and derivatives:
-
-```bash
-cat >/etc/yum.repos.d/CentOS-Stream-Extras.repo <<'EOF'
-[cs8-extras]
-name=CentOS Stream $releasever - Extras
-baseurl=https://vault.centos.org/$contentdir/8-stream/extras/$basearch/os/
-gpgcheck=1
-enabled=1
-gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-Official
-EOF
-
-cat >/etc/yum.repos.d/CentOS-Stream-Extras-common.repo <<'EOF'
-[cs8-extras-common]
-name=CentOS Stream $releasever - Extras common packages
-baseurl=https://vault.centos.org/$contentdir/8-stream/extras/$basearch/extras-common/
-gpgcheck=1
-enabled=1
-gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-SIG-Extras
-EOF
-
-
-echo "8-stream" > /etc/yum/vars/stream
+The following repositories need to be enabled for RHEL 9.x only.
 
-dnf distro-sync --nobest
-```
-
-
-## Installing on RHEL 9.0 or derivatives
-
-Specific to RHEL only:
 ```bash
 subscription-manager repos --enable rhel-9-for-x86_64-baseos-rpms
 subscription-manager repos --enable rhel-9-for-x86_64-appstream-rpms
 subscription-manager repos --enable codeready-builder-for-rhel-9-x86_64-rpms
 subscription-manager repos --enable rhel-9-for-x86_64-resilientstorage-rpms
-
-rpm -i --justdb --nodeps --force "http://mirror.stream.centos.org/9-stream/BaseOS/$(rpm --eval '%_arch')/os/Packages/centos-stream-release-9.0-26.el9.noarch.rpm"
 ```
 
-> **NOTE**
-> If installation fails on `centos-stream-release-9.0-26.el9.noarch.rpm` please check the content of the repository for a newer version of that package.
+## For RHEL 9.x and RHEL 9.x derivatives
 
-Common to RHEL 9.0 and derivatives:
+Once a minimal RHEL 9.x (or derivative) system has been built, you can install the pre-production master snapshots (oVirt Release 4.5.6 + Engine 4.5.7)
 
 ```bash
-cat >/etc/yum.repos.d/CentOS-Stream-Extras-common.repo <<'EOF'
-[c9s-extras-common]
-name=CentOS Stream $releasever - Extras packages
-metalink=https://mirrors.centos.org/metalink?repo=centos-extras-sig-extras-common-$stream&arch=$basearch&protocol=https,http
-gpgkey=https://www.centos.org/keys/RPM-GPG-KEY-CentOS-SIG-Extras
-gpgcheck=1
-repo_gpgcheck=0
-metadata_expire=6h
-countme=1
-enabled=1
-EOF
-
-echo "9-stream" > /etc/yum/vars/stream
-
-dnf distro-sync --nobest
+dnf copr enable -y ovirt/ovirt-master-snapshot centos-stream-9
+dnf install -y ovirt-release-master
 ```
 
-Due to [Bug 2091581](https://bugzilla.redhat.com/show_bug.cgi?id=2091581), while installing the virtualization host
-you will be missing `nmstate-plugin-ovsdb` or `python3-libnmstate` unless you install them from
-CentOS build [nmstate-2.0.0-2.el9](https://kojihub.stream.centos.org/koji/buildinfo?buildID=17369).
-While installing it you need to ensure openvswitch2.15 will be installed instead of any later version.
-
-Here's how to do that:
-
-```bash
-dnf install -y centos-release-ovirt45
-dnf install -y ovirt-openvswitch
-dnf install -y \
-https://kojihub.stream.centos.org/kojifiles/packages/nmstate/2.0.0/2.el9/noarch/nmstate-plugin-ovsdb-2.0.0-2.el9.noarch.rpm \
-https://kojihub.stream.centos.org/kojifiles/packages/nmstate/2.0.0/2.el9/noarch/python3-libnmstate-2.0.0-2.el9.noarch.rpm
-
-```
+At this point you can choose to install the :
+*   Minimal Host + Self-Hosted Engine, `dnf install -y ovirt-hosted-engine-setup`
+*   A minimal host, `dnf install -y ovirt-host`