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.. _compute-trusted-pools.rst:
=====================
System administration
=====================
.. toctree::
:maxdepth: 2
manage-users.rst
manage-volumes.rst
flavors.rst
default-ports.rst
admin-password-injection.rst
manage-the-cloud.rst
manage-logs.rst
root-wrap-reference.rst
configuring-migrations.rst
live-migration-usage.rst
remote-console-access.rst
service-groups.rst
node-down.rst
adv-config.rst
To effectively administer compute, you must understand how the different
installed nodes interact with each other. Compute can be installed in many
different ways using multiple servers, but generally multiple compute nodes
control the virtual servers and a cloud controller node contains the remaining
Compute services.
The Compute cloud works using a series of daemon processes named ``nova-*``
that exist persistently on the host machine. These binaries can all run on the
same machine or be spread out on multiple boxes in a large deployment. The
responsibilities of services and drivers are:
**Services**
``nova-api``
Receives XML requests and sends them to the rest of the system. A WSGI app
routes and authenticates requests. Supports the OpenStack Compute APIs. A
``nova.conf`` configuration file is created when Compute is installed.
``nova-compute``
Manages virtual machines. Loads a Service object, and exposes the public
methods on ComputeManager through a Remote Procedure Call (RPC).
``nova-conductor``
Provides database-access support for compute nodes (thereby reducing security
risks).
``nova-consoleauth``
Manages console authentication.
.. deprecated:: 18.0.0
``nova-consoleauth`` is deprecated since 18.0.0 (Rocky) and will be removed
in an upcoming release.
``nova-objectstore``
A simple file-based storage system for images that replicates most of the S3
API. It can be replaced with OpenStack Image service and either a simple
image manager or OpenStack Object Storage as the virtual machine image
storage facility. It must exist on the same node as ``nova-compute``.
``nova-network``
Manages floating and fixed IPs, DHCP, bridging and VLANs. Loads a Service
object which exposes the public methods on one of the subclasses of
NetworkManager. Different networking strategies are available by changing the
``network_manager`` configuration option to ``FlatManager``,
``FlatDHCPManager``, or ``VLANManager`` (defaults to ``VLANManager`` if
nothing is specified).
.. deprecated:: 14.0.0
``nova-network`` was deprecated in the OpenStack Newton release.
``nova-scheduler``
Dispatches requests for new virtual machines to the correct node.
``nova-novncproxy``
Provides a VNC proxy for browsers, allowing VNC consoles to access virtual
machines.
.. note::
Some services have drivers that change how the service implements its core
functionality. For example, the ``nova-compute`` service supports drivers
that let you choose which hypervisor type it can use. ``nova-network`` and
``nova-scheduler`` also have drivers.
|
