openstack/openstack-ansible
Code Issues Proposed changes
bf6ba53fef
openstack-ansible/deploy-guide/source/overview-requirements.rst
Dmitriy Rabotyagov d72b3394a2 Remove Ubuntu 20.04 support 
With ansible-core>=2.14 python 3.8 support has been dropped. Moreover,
nova has bumped minimal required version for libvirt/qemu, which makes
us to remove support for Ubuntu 20.04 Focal Fossa.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-os_zun/+/884362
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-os_manila/+/884363
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-os_neutron/+/884361
Change-Id: I3e6e22553248a9199113a65b0dbe992c38ccb22e
2023-07-07 12:39:23 +02:00

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Software requirements

Ensure that all hosts within the OpenStack-Ansible (OSA) environment meet the following minimum requirements:

  • Debian
    • Debian 11 (bullseye)
  • Ubuntu
    • Ubuntu 22.04 LTS (Jammy Jellyfish) Note: Due to the absence of community repos, Ceph packages will be installed from the default repository which contains only Quincy release.
  • CentOS
    • Centos 9 Stream
    • Rocky Linux 9
  • Secure Shell (SSH) client and server that support public key authentication
  • Python 3.8.x or 3.10.x
  • en_US.UTF-8 as the locale

CPU recommendations

  • Compute hosts should have multicore processors with hardware-assisted virtualization extensions. These extensions provide a significant performance boost and improve security in virtualized environments.
  • Infrastructure (control plane) hosts should have multicore processors for best performance. Some services, such as MySQL, benefit from additional CPU cores and other technologies, such as Hyper-threading.

Storage/disk recommendations

Different hosts have different disk space requirements based on the services running on each host:

Deployment hosts

A minimum of 10 GB of disk space is sufficient for holding the OpenStack-Ansible repository content and additional required software.

Compute hosts

Disk space requirements depend on the total number of instances running on each host and the amount of disk space allocated to each instance.

Consider disks that provide higher I/O throughput with lower latency, such as SSD drives in a RAID array.

Storage hosts

Hosts running the Block Storage (cinder) service often consume the most disk space in OpenStack environments.

As with Compute hosts, choose disks that provide the highest I/O throughput with the lowest latency.

OpenStack-Ansible is able to deploy Cinder with a series of different backends and uses Logical Volume Manager (LVM), by default. Hosts that provide Block Storage volumes with LVM are recommended to have a large disk space available allocated to a cinder-volume volume group, which OpenStack-Ansible can configure for use with Block Storage.

Infrastructure (control plane) hosts

The OpenStack control plane contains storage-intensive services, such as the Image service (glance), and MariaDB. These hosts must have a minimum of 100 GB of disk space.

Each infrastructure (control plane) host runs services inside machine containers. The container file systems are deployed by default on the root file system of each control plane host. You have the option to deploy those container file systems into logical volumes by creating a volume group called lxc. OpenStack-Ansible creates a 5 GB logical volume for the file system of each container running on the host.

Other technologies leveraging copy-on-write can be used to reduce the disk space requirements on machine containers.

Network recommendations

Note

You can deploy an OpenStack environment with only one physical network interface. This works for small environments, but it can cause problems when your environment grows.

For the best performance, reliability, and scalability in a production environment, consider a network configuration that contains the following features:

  • Bonded network interfaces, which increase performance, reliability, or both (depending on the bonding architecture)
  • VLAN offloading, which increases performance by adding and removing VLAN tags in hardware, rather than in the server's main CPU
  • Gigabit or 10 Gigabit Ethernet, which supports higher network speeds and can also improve storage performance when using the Block Storage service
  • Jumbo frames, which increase network performance by allowing more data to be sent in each packet