186 lines
5.7 KiB
ReStructuredText
186 lines
5.7 KiB
ReStructuredText
Configuring the operating system
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================================
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This section describes the installation and configuration of operating
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systems for the target hosts, as well as deploying SSH keys and
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configuring storage.
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Installing the operating system
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Install one of the following supported operating systems on the
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target host:
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* Ubuntu server 22.04 (Jammy Jellyfish) LTS 64-bit
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* Ubuntu server 24.04 (Noble Numbat) LTS 64-bit
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* Debian 12 64-bit
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* Centos 9 Stream 64-bit
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* Rocky Linux 9 64-bit
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Configure at least one network interface to access the Internet or
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suitable local repositories.
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Some distributions add an extraneous entry in the ``/etc/hosts`` file that
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resolves the actual hostname to another loopback IP address such as
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``127.0.1.1``. You must comment out or remove this entry to prevent name
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resolution problems. **Do not remove the 127.0.0.1 entry.**
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This step is especially important for `metal` deployments.
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We recommend adding the Secure Shell (SSH) server packages to the
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installation on target hosts that do not have local (console) access.
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.. note::
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We also recommend setting your locale to `en_US.UTF-8`. Other locales might
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work, but they are not tested or supported.
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Configure Debian
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~~~~~~~~~~~~~~~~
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#. Update package source lists
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.. code-block:: shell-session
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# apt update
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#. Upgrade the system packages and kernel:
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.. code-block:: shell-session
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# apt dist-upgrade
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#. Install additional software packages:
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.. code-block:: shell-session
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# apt install bridge-utils debootstrap ifenslave ifenslave-2.6 \
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lsof lvm2 openssh-server sudo tcpdump vlan python3
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#. Reboot the host to activate the changes and use the new kernel.
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Configure Ubuntu
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~~~~~~~~~~~~~~~~
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#. Update package source lists
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.. code-block:: shell-session
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# apt update
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#. Upgrade the system packages and kernel:
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.. code-block:: shell-session
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# apt dist-upgrade
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#. Install additional software packages:
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.. code-block:: shell-session
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# apt install bridge-utils debootstrap openssh-server \
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tcpdump vlan python3
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#. Install the kernel extra package if you have one for your kernel version \
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.. code-block:: shell-session
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# apt install linux-modules-extra-$(uname -r)
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#. Reboot the host to activate the changes and use the new kernel.
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Configure CentOS / Rocky
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~~~~~~~~~~~~~~~~~~~~~~~~
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#. Upgrade the system packages and kernel:
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.. code-block:: shell-session
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# dnf upgrade
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#. Disable SELinux. Edit ``/etc/sysconfig/selinux``, make sure that
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``SELINUX=enforcing`` is changed to ``SELINUX=disabled``.
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.. note::
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SELinux enabled is not currently supported in OpenStack-Ansible
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for CentOS/RHEL due to a lack of maintainers for the feature.
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#. Install additional software packages:
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.. code-block:: shell-session
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# dnf install iputils lsof openssh-server\
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sudo tcpdump python3
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#. (Optional) Reduce the kernel log level by changing the printk
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value in your sysctls:
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.. code-block:: shell-session
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# echo "kernel.printk='4 1 7 4'" >> /etc/sysctl.conf
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#. Reboot the host to activate the changes and use the new kernel.
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Configure SSH keys
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==================
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Ansible uses SSH to connect the deployment host and target hosts. You can
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either use ``root`` user or any other user that is allowed to escalate
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privileges through `Ansible become`_ (like adding user to sudoers).
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For more details, please reffer to the `Running as non-root`_.
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#. Copy the contents of the public key file on the deployment host to
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the ``~/.ssh/authorized_keys`` file on each target host.
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#. Test public key authentication from the deployment host to each target
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host by using SSH to connect to the target host from the deployment host.
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If you can connect and get the shell without authenticating, it
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is working. SSH provides a shell without asking for a
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password.
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For more information about how to generate an SSH key pair, as well as best
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practices, see `GitHub's documentation about generating SSH keys`_.
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.. _GitHub's documentation about generating SSH keys: https://help.github.com/articles/generating-ssh-keys/
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.. _Ansible become: https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_privilege_escalation.html
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.. _Running as non-root: https://docs.openstack.org/openstack-ansible/latest/user/security/non-root.rst
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Configuring the storage
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=======================
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`Logical Volume Manager (LVM)`_ enables a single device to be split into
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multiple logical volumes that appear as a physical storage device to the
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operating system. The Block Storage (cinder) service, and LXC containers
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that optionally run the OpenStack infrastructure,
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can optionally use LVM for their data storage.
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.. note::
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OpenStack-Ansible automatically configures LVM on the nodes, and
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overrides any existing LVM configuration. If you had a customized LVM
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configuration, edit the generated configuration file as needed.
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#. To use the optional Block Storage (cinder) service, create an LVM
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volume group named ``cinder-volumes`` on the storage host. Specify a metadata
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size of 2048 when creating the physical volume. For example:
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.. code-block:: shell-session
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# pvcreate --metadatasize 2048 physical_volume_device_path
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# vgcreate cinder-volumes physical_volume_device_path
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#. Optionally, create an LVM volume group named ``lxc`` for container file
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systems and set ``lxc_container_backing_store: lvm`` in user_variables.yml
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if you want to use LXC with LVM. If the ``lxc`` volume group does not
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exist, containers are automatically installed on the file system under
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``/var/lib/lxc`` by default.
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.. _Logical Volume Manager (LVM): https://en.wikipedia.org/wiki/Logical_Volume_Manager_(Linux)
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