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[OpenStack Infra <1852446@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/701998
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1efd5ec2328b82092d8cc46574b29fa315b9acfd
Submitter: Zuul
Branch:    master

commit 1efd5ec2328b82092d8cc46574b29fa315b9acfd
Author: Iury Gregory Melo Ferreira <imelofer@xxxxxxxxxx>
Date:   Thu Jan 9 14:41:10 2020 +0100

    Add ironic hypervisor doc
    
    Nova documentation was missing information documentation about
    Ironic virt driver.
    
    Change-Id: I2431dc3db94da44001eefdead50607eab662d16f
    Closes-Bug: #1852446


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1852446

Title:
  Hypervisors in nova - no subpage details for ironic

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  - [x] This is a doc addition request.

  The admin configuration for hypervisors does not have a subpage with
  details about configuring nova with the ironic compute driver. There
  are at least a few things that could go into a page like that:

  * Summary of what it does and how it interacts with the ironic service
  as a 'hypervisor'. Some of that information is available in the ironic
  docs, e.g.:

  https://docs.openstack.org/ironic/latest/install/get_started.html?highlight=nova
  #interaction-with-openstack-components

  Since it comes up from time to time, I would also mention that the
  ironic driver is the only one in nova where the compute_nodes table
  record is 1:M with the compute services table record for the given
  host, meaning a nova-compute service can manage multiple ComputeNodes,
  and the ComputeNodes for the ironic driver managed compute service
  uses the ironic node uuid for the compute node hypervisor_hostname
  (nodename) and uuid fields. And ironic node : compute node : instance
  are 1:1:1. This is more contributor/reference information but it's
  worth mentioning somewhere since it's kind of tribal knowledge in
  nova.

  * Ironic-specific configuration:
  https://docs.openstack.org/nova/latest/configuration/config.html#ironic

  - This could also include things like configuring baremetal flavors:
  https://docs.openstack.org/ironic/latest/install/configure-nova-
  flavors.html

  - Running multiple nova-computes in HA mode managing the same set of
  nodes:

  https://specs.openstack.org/openstack/nova-
  specs/specs/newton/implemented/ironic-multiple-compute-hosts.html

  * Scaling and performance issues. Some of this is discussed in this
  mailing list thread:

  http://lists.openstack.org/pipermail/openstack-
  discuss/2019-November/thread.html#10655

  - Partitioning schemes: https://specs.openstack.org/openstack/nova-
  specs/specs/stein/implemented/ironic-conductor-groups.html

  * Known limitations / missing features, e.g. move operations
  (migrate/resize).

  -----------------------------------
  Release:  on 2018-09-04 18:11:45
  SHA: 8a71962e0149fa9ad7f66c17849bf69df3e78d33
  Source: https://opendev.org/openstack/nova/src/doc/source/admin/configuration/hypervisors.rst
  URL: https://docs.openstack.org/nova/latest/admin/configuration/hypervisors.html

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