diff --git a/doc/source/install/index.rst b/doc/source/install/index.rst
index 59cfdec89..1e8c6cd95 100644
--- a/doc/source/install/index.rst
+++ b/doc/source/install/index.rst
@@ -21,8 +21,8 @@ Installation and use of bifrost is split into roughly three steps:
 Supported operating systems:
 
 * Ubuntu 16.04, 18.04
-* Red Hat Enterprise Linux (RHEL) 7
-* CentOS 7
+* Red Hat Enterprise Linux (RHEL) 8
+* CentOS 8
 * Fedora 22
 * openSUSE Leap 42.1, 42.2
 
@@ -51,48 +51,37 @@ RHEL
 Enable additional repositories (RHEL only)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-The ``extras`` and ``optional`` yum repositories must be enabled to satisfy
+The ``extras`` and ``optional`` dnf repositories must be enabled to satisfy
 bifrost's dependencies. To check::
 
-   sudo yum repolist | grep 'optional\|extras'
+   sudo dnf repolist | grep 'optional\|extras'
 
 To view the status of repositories::
 
-   sudo yum repolist all | grep 'optional\|extras'
+   sudo dnf repolist all | grep 'optional\|extras'
 
 The output will look like this::
 
-  !rhui-REGION-rhel-server-debug-extras/7Server/x86_64        Red H disabled
-  rhui-REGION-rhel-server-debug-optional/7Server/x86_64       Red H disabled
-  rhui-REGION-rhel-server-extras/7Server/x86_64               Red H disabled
-  rhui-REGION-rhel-server-optional/7Server/x86_64             Red H disabled
-  rhui-REGION-rhel-server-source-extras/7Server/x86_64        Red H disabled
-  rhui-REGION-rhel-server-source-optional/7Server/x86_64      Red H disabled
+  !rhui-REGION-rhel-server-debug-extras/8Server/x86_64        Red H disabled
+  rhui-REGION-rhel-server-debug-optional/8Server/x86_64       Red H disabled
+  rhui-REGION-rhel-server-extras/8Server/x86_64               Red H disabled
+  rhui-REGION-rhel-server-optional/8Server/x86_64             Red H disabled
+  rhui-REGION-rhel-server-source-extras/8Server/x86_64        Red H disabled
+  rhui-REGION-rhel-server-source-optional/8Server/x86_64      Red H disabled
 
 Use the names of the repositories (minus the version and architecture)
 to enable them::
 
-  sudo yum-config-manager --enable rhui-REGION-rhel-server-optional
-  sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
+  sudo dnf config-manager --enable rhui-REGION-rhel-server-optional
+  sudo dnf config-manager --enable rhui-REGION-rhel-server-extras
 
 Enable the EPEL repository
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-The Extra Packages for Enterprise Linux (EPEL) repository contains
-some of bifrost's dependencies. To enable it, install the
-``epel-release`` package as follows::
-
-  sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
-
-CentOS
-------
-
-Enable the EPEL repository (CentOS)
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-To enable EPEL on CentOS, run::
-
-  sudo yum install epel-release
+The Extra Packages for Enterprise Linux (EPEL) are required to install some
+dependencies. Please refer to the
+`official wiki page <https://fedoraproject.org/wiki/EPEL>`_ to install and
+configure them.
 
 Performing the installation
 ===========================
diff --git a/doc/source/install/offline-install.rst b/doc/source/install/offline-install.rst
index ae0dbc380..f5dc44ae0 100644
--- a/doc/source/install/offline-install.rst
+++ b/doc/source/install/offline-install.rst
@@ -43,8 +43,8 @@ this.
 
 .. code-block:: yaml
 
-    ipa_kernel_upstream_url: file:///vagrant/ipa-centos7-master.kernel
-    ipa_ramdisk_upstream_url: file:///vagrant/ipa-centos7-master.initramfs
+    ipa_kernel_upstream_url: file:///vagrant/ipa-centos8-master.kernel
+    ipa_ramdisk_upstream_url: file:///vagrant/ipa-centos8-master.initramfs
     cirros_deploy_image_upstream_url: file:///vagrant/cirros-0.4.0-x86_64-disk.img
     dib_git_url: file:///vagrant/git/diskimage-builder
     ironicclient_git_url: file:///vagrant/git/python-ironicclient
diff --git a/doc/source/user/troubleshooting.rst b/doc/source/user/troubleshooting.rst
index 4815ff8b8..7f1eaf0b8 100644
--- a/doc/source/user/troubleshooting.rst
+++ b/doc/source/user/troubleshooting.rst
@@ -170,9 +170,9 @@ DIB-based or any other IPA image, you will need to take the following steps:
    file and update the ``ipa_kernel_upstream_url`` and
    ``ipa_kernel_upstream_url`` settings to a new URL.
    For DIB-based images, these urls would be,
-   ``https://tarballs.openstack.org/ironic-python-agent/dib/files/ipa-centos7-master.kernel``
+   ``https://tarballs.openstack.org/ironic-python-agent/dib/files/ipa-centos8-master.kernel``
    and
-   ``https://tarballs.openstack.org/ironic-python-agent/dib/files/ipa-centos7-master.initramfs``
+   ``https://tarballs.openstack.org/ironic-python-agent/dib/files/ipa-centos8-master.initramfs``
    respectively.
 #. Execute the installation playbook, and the set files will be automatically
    downloaded again. If the files are not removed prior to (re)installation,