diff --git a/doc/install-guide/source/environment-memcached-rdo.rst b/doc/install-guide/source/environment-memcached-rdo.rst
index c6de5a57f3..34ee0483e1 100644
--- a/doc/install-guide/source/environment-memcached-rdo.rst
+++ b/doc/install-guide/source/environment-memcached-rdo.rst
@@ -11,10 +11,18 @@ Install and configure components
 
 #. Install the packages:
 
+   **For CentOS 7 and RHEL 7**
+
    .. code-block:: console
 
       # yum install memcached python-memcached
 
+   **For CentOS 8 and RHEL 8**
+
+   .. code-block:: console
+
+      # yum install memcached python3-memcached
+
 2. Edit the ``/etc/sysconfig/memcached`` file and complete the
    following actions:
 
diff --git a/doc/install-guide/source/environment-packages-rdo.rst b/doc/install-guide/source/environment-packages-rdo.rst
index 54d3077f36..c2b6b5a530 100644
--- a/doc/install-guide/source/environment-packages-rdo.rst
+++ b/doc/install-guide/source/environment-packages-rdo.rst
@@ -5,6 +5,13 @@ Distributions release OpenStack packages as part of the distribution or
 using other methods because of differing release schedules. Perform
 these procedures on all nodes.
 
+.. warning::
+
+   Starting with the Ussuri release, you will need to use either CentOS8
+   or RHEL 8. Previous OpenStack releases will need to use either CentOS7
+   or RHEL 7. Instructions are included for both distributions and
+   versions where different.
+
 .. note::
 
    The set up of OpenStack packages described here needs to be done on
@@ -36,34 +43,69 @@ Prerequisites
 
 #. When using RHEL, it is assumed that you have registered your system using
    Red Hat Subscription Management and that you have the
-   ``rhel-7-server-rpms`` repository enabled by default.
+   ``rhel-7-server-rpms`` or ``rhel-8-for-x86_64-baseos-rpms`` repository
+   enabled by default depending on your version.
 
-   For more information on registering the system, see the
+   For more information on registering a RHEL 7 system, see the
    `Red Hat Enterprise Linux 7 System Administrator's Guide
    <https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/part-Subscription_and_Support.html>`_.
 
-#. In addition to ``rhel-7-server-rpms``, you also need to have the
-   ``rhel-7-server-optional-rpms``, ``rhel-7-server-extras-rpms``, and
-   ``rhel-7-server-rh-common-rpms`` repositories enabled:
+#. In addition to ``rhel-7-server-rpms`` on a RHEL 7 system, you also need to
+   have the ``rhel-7-server-optional-rpms``, ``rhel-7-server-extras-rpms``,
+   and ``rhel-7-server-rh-common-rpms`` repositories enabled:
 
    .. code-block:: console
 
       # subscription-manager repos --enable=rhel-7-server-optional-rpms \
         --enable=rhel-7-server-extras-rpms --enable=rhel-7-server-rh-common-rpms
 
+   For more information on registering a RHEL 8 system, see the
+   `Red Hat Enterprise Linux 8 Installation Guide
+   <https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/performing_a_standard_rhel_installation/post-installation-tasks_installing-rhel>`_.
+
+   In addition to ``rhel-8-for-x86_64-baseos-rpms`` on a RHEL 8 system, you
+   also need to have the ``rhel-8-for-x86_64-appstream-rpms``,
+   ``rhel-8-for-x86_64-supplementary-rpms``, and ``codeready-builder-for-rhel-8-x86_64-rpms``
+   repositories enabled:
+
+   .. code-block:: console
+
+      # subscription-manager repos --enable=rhel-8-for-x86_64-appstream-rpms \
+        --enable=rhel-8-for-x86_64-supplementary-rpms --enable=codeready-builder-for-rhel-8-x86_64-rpms
+
 Enable the OpenStack repository
 -------------------------------
 
 * On CentOS, the ``extras`` repository provides the RPM that enables the
   OpenStack repository. CentOS includes the ``extras`` repository by
   default, so you can simply install the package to enable the OpenStack
+  repository. For CentOS8, you will also need to enable the PowerTools
   repository.
 
+  **When installing the Ussuri release, run:**
+
+  .. code-block:: console
+
+     # yum install centos-release-openstack-ussuri
+     # yum config-manager --set-enabled PowerTools
+
+  **When installing the Train release, run:**
+
+  .. code-block:: console
+
+     # yum install centos-release-openstack-train
+
+  **When installing the Stein release, run:**
+
+  .. code-block:: console
+
+     # yum install centos-release-openstack-stein
+
   **When installing the Rocky release, run:**
 
   .. code-block:: console
 
-       # yum install centos-release-openstack-rocky
+     # yum install centos-release-openstack-rocky
 
   **When installing the Queens release, run:**
 
@@ -100,12 +142,20 @@ Finalize the installation
       If the upgrade process includes a new kernel, reboot your host
       to activate it.
 
-2. Install the OpenStack client:
+2. Install the appropriate OpenStack client for your version.
+
+   **For CentOS 7 and RHEL 7**
 
    .. code-block:: console
 
       # yum install python-openstackclient
 
+   **For CentOS 8 and RHEL 8**
+
+   .. code-block:: console
+
+      # yum install python3-openstackclient
+
 3. RHEL and CentOS enable :term:`SELinux` by default. Install the
    ``openstack-selinux`` package to automatically manage security
    policies for OpenStack services:
diff --git a/doc/install-guide/source/preface.rst b/doc/install-guide/source/preface.rst
index 7e6f1c40de..47f30dc24e 100644
--- a/doc/install-guide/source/preface.rst
+++ b/doc/install-guide/source/preface.rst
@@ -47,8 +47,14 @@ openSUSE and SUSE Linux Enterprise Server
   Service Cloud repository.
 
 Red Hat Enterprise Linux and CentOS
-  You can install OpenStack by using packages available on Red Hat
-  Enterprise Linux 7 and its derivatives through the RDO repository.
+  You can install OpenStack by using packages available on both Red
+  Hat Enterprise Linux 7 and 8 and their derivatives through the RDO
+  repository.
+
+  ..note::
+
+    OpenStack Ussuri is available for both CentOS 8 and RHEL 8. OpenStack
+    Train and earlier are available on both CentOS 7 and RHEL 7.
 
 Ubuntu
   You can walk through an installation by using packages available through