diff --git a/deploy-guide/source/deploymenthost.rst b/deploy-guide/source/deploymenthost.rst
index 945ebbedca..0473320cb1 100644
--- a/deploy-guide/source/deploymenthost.rst
+++ b/deploy-guide/source/deploymenthost.rst
@@ -44,14 +44,14 @@ Before you begin, we recommend upgrading your system packages and kernel.
 
    .. code-block:: shell-session
 
-       # apt-get update
+       # apt update
 
 
 #. Upgrade the system packages and kernel:
 
    .. code-block:: shell-session
 
-       # apt-get dist-upgrade
+       # apt dist-upgrade
 
 #. Reboot the host.
 
@@ -60,7 +60,7 @@ Before you begin, we recommend upgrading your system packages and kernel.
 
    .. code-block:: shell-session
 
-       # apt-get install aptitude build-essential git ntp ntpdate openssh-server python-dev sudo
+       # apt install build-essential git ntp ntpdate openssh-server python3-dev sudo
 
 #. Configure NTP to synchronize with a suitable time source.
 
@@ -74,7 +74,7 @@ Before you begin, we recommend upgrading your system packages and kernel.
 
    .. code-block:: shell-session
 
-       # yum upgrade
+       # dnf upgrade
 
 #. Reboot the host.
 
@@ -83,8 +83,9 @@ Before you begin, we recommend upgrading your system packages and kernel.
 
    .. parsed-literal::
 
-       # yum install \https://rdoproject.org/repos/openstack-|rdo_series|/rdo-release-|rdo_series|.rpm
-       # yum install git ntp ntpdate openssh-server python-devel sudo '\@Development Tools'
+       # dnf install \https://repos.fedorapeople.org/repos/openstack/openstack-|rdo_series|/rdo-release-|rdo_series|.el8.rpm
+       # dnf install git chrony openssh-server python3-devel sudo
+       # dnf group install "Development Tools"
 
 #. Configure NTP to synchronize with a suitable time source.
 
diff --git a/deploy-guide/source/targethosts-prepare.rst b/deploy-guide/source/targethosts-prepare.rst
index 44e8ff9e1d..bc8ba428db 100644
--- a/deploy-guide/source/targethosts-prepare.rst
+++ b/deploy-guide/source/targethosts-prepare.rst
@@ -14,7 +14,6 @@ target host:
 * Ubuntu server 18.04 (Bionic Beaver) LTS 64-bit
 * Ubuntu server 20.04 (Focal Fossa) LTS 64-bit
 * Debian 10 64-bit
-* Centos 7 64-bit
 * Centos 8 64-bit
 
 Configure at least one network interface to access the Internet or
@@ -35,13 +34,13 @@ Configure Ubuntu
 
    .. code-block:: shell-session
 
-       # apt-get update
+       # apt update
 
 #. Upgrade the system packages and kernel:
 
    .. code-block:: shell-session
 
-       # apt-get dist-upgrade
+       # apt dist-upgrade
 
 #. Reboot the host.
 
@@ -55,7 +54,7 @@ Configure Ubuntu
 
    .. code-block:: shell-session
 
-       # apt-get install bridge-utils debootstrap ifenslave ifenslave-2.6 \
+       # apt install bridge-utils debootstrap ifenslave ifenslave-2.6 \
          lsof lvm2 chrony openssh-server sudo tcpdump vlan python3
 
 #. Install the kernel extra package if you have one for your kernel version \
@@ -88,7 +87,7 @@ Configure CentOS
 
    .. code-block:: shell-session
 
-       # yum upgrade
+       # dnf upgrade
 
 #. Disable SELinux. Edit ``/etc/sysconfig/selinux``, make sure that
    ``SELINUX=enforcing`` is changed to ``SELINUX=disabled``.
@@ -110,8 +109,8 @@ Configure CentOS
 
    .. code-block:: shell-session
 
-       # yum install bridge-utils iputils lsof lvm2 \
-         chrony openssh-server sudo tcpdump python3
+       # dnf install iputils lsof lvm2 chrony \
+         openssh-server sudo tcpdump python3
 
 #. Add the appropriate kernel modules to the ``/etc/modules-load.d`` file to
    enable VLAN and bond interfaces: