149 lines
4.8 KiB
ReStructuredText
149 lines
4.8 KiB
ReStructuredText
Software requirements
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~~~~~~~~~~~~~~~~~~~~~
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Ensure that all hosts within an OpenStack-Ansible (OSA) environment meet the
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following minimum requirements:
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* Debian
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* Debian 10 (buster)
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* Linux kernel version ``4.9.0-0-amd64`` or later is required.
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* Ubuntu
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* Ubuntu 18.04 LTS (Bionic Beaver)
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* Ubuntu 20.04 LTS (Focal Fossa)
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* Linux kernel version ``4.15.0-0-generic`` or later is required.
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* CentOS
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* Centos 8
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* Linux kernel version ``3.10.0`` or later.
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* Secure Shell (SSH) client and server that support public key
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authentication
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* Network Time Protocol (NTP) client for time synchronization (such as
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``ntpd`` or ``chronyd``)
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* Python 3.6.*x* or 3.7.*x*
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* en_US.UTF-8 as the locale
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CPU recommendations
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~~~~~~~~~~~~~~~~~~~
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* Compute hosts should have multicore processors with `hardware-assisted
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virtualization extensions`_. These extensions provide a
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significant performance boost and improve security in virtualized
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environments.
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* Infrastructure (control plane) hosts should have multicore processors for
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best performance. Some services, such as MySQL, benefit from
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additional CPU cores and other technologies, such as `Hyper-threading`_.
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.. _hardware-assisted virtualization extensions: https://en.wikipedia.org/wiki/Hardware-assisted_virtualization
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.. _Hyper-threading: https://en.wikipedia.org/wiki/Hyper-threading
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Storage/disk recommendations
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Different hosts have different disk space requirements based on the
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services running on each host:
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Deployment hosts
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----------------
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A minimum of ``10 GB`` of disk space is sufficient for holding the
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OpenStack-Ansible repository content and additional required software.
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Compute hosts
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-------------
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Disk space requirements depend on the total number of instances
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running on each host and the amount of disk space allocated to each instance.
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.. tip ::
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Consider disks that provide higher I/O throughput with lower latency,
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such as SSD drives in a RAID array.
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Storage hosts
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-------------
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Hosts running the Block Storage (cinder) service often consume the most disk
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space in OpenStack environments.
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.. tip ::
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As with Compute hosts, choose disks that provide the highest
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I/O throughput with the lowest latency.
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OpenStack-Ansible is able to deploy Cinder with a series of different
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backends and uses Logical Volume Manager (LVM), by default.
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Hosts that provide Block Storage volumes with LVM are recommended to
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have a large disk space available allocated to a ``cinder-volume``
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volume group, which OpenStack-Ansible can configure for use with Block Storage.
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Infrastructure (control plane) hosts
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------------------------------------
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The OpenStack control plane contains storage-intensive services, such as the
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Image service (glance), and MariaDB. These hosts must have a minimum of
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``100 GB`` of disk space.
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Each infrastructure (control plane) host runs services inside machine containers.
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The container file systems are deployed by default on the root file system of
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each control plane host. You have the option to deploy those container file
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systems into logical volumes by creating a volume group called lxc.
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OpenStack-Ansible creates a 5 GB logical volume for the file system of each
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container running on the host.
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.. tip ::
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Other technologies leveraging copy-on-write can be used to reduce
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the disk space requirements on machine containers.
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Logging hosts
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-------------
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An OpenStack-Ansible deployment generates a significant amount of log
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information. Logs come from a variety of sources, including services running
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in containers, the containers themselves, and the physical hosts. Logging
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hosts need sufficient disk space to hold live and rotated (historical) log
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files. In addition, the storage performance must be able to keep pace with
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the log traffic coming from various hosts and containers within the OpenStack
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environment. Reserve a minimum of ``50 GB`` of disk space for storing logs on
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the logging hosts.
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Network recommendations
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~~~~~~~~~~~~~~~~~~~~~~~
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.. note::
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You can deploy an OpenStack environment with only one physical
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network interface. This works for small environments, but it can cause
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problems when your environment grows.
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For the best performance, reliability, and scalability in a production
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environment, consider a network configuration that contains
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the following features:
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* Bonded network interfaces, which increase performance, reliability, or both
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(depending on the bonding architecture)
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* VLAN offloading, which increases performance by adding and removing VLAN tags
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in hardware, rather than in the server's main CPU
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* Gigabit or 10 Gigabit Ethernet, which supports higher network speeds and can
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also improve storage performance when using the Block Storage service
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* Jumbo frames, which increase network performance by allowing more data to
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be sent in each packet
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