openstack
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nova
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Edits for Cells V2 step-by-step examples 

This addresses comments from the original patch set to add more
detail to the steps.

Change-Id: Ibebef30b499dc9b4c6ce8d43f4d8faf9eb93f809
This commit is contained in:
melanie witt 2017-02-08 18:57:15 +00:00
parent 50d402821b
commit 59f6423549
1 changed files with 24 additions and 15 deletions
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39
doc/source/cells.rst
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@ -362,8 +362,8 @@ database yet. This will set up a single cell Nova deployment.
3. Run the ``map_cell0`` command to create and map cell0::
nova-manage cell_v2 map_cell0 --database_connection <database connection
url>
nova-manage cell_v2 map_cell0 \
--database_connection <database connection url>
The database connection url is generated based on the
``[database]/connection`` setting in the Nova configuration file if not
@ -376,16 +376,17 @@ database yet. This will set up a single cell Nova deployment.
5. Run the ``create_cell`` command to create the single cell which will contain
your compute hosts::
nova-manage cell_v2 create_cell --name <name> --transport-url
<transport url for message queue> --database_connection <database
connection url>
nova-manage cell_v2 create_cell --name <name> \
--transport-url <transport url for message queue> \
--database_connection <database connection url>
The transport url is taken from the ``[DEFAULT]/transport_url`` setting in
the Nova configuration file if not specified on the command line. The
database url is taken from the ``[database]/connection`` setting in the Nova
configuration file if not specified on the command line.
6. Configure and start your compute hosts.
6. Configure and start your compute hosts. Before step 7, make sure you have
compute hosts in the database by running ``nova hypervisor-list``.
7. Run the ``discover_hosts`` command to map compute hosts to the single cell::
@ -395,7 +396,13 @@ database yet. This will set up a single cell Nova deployment.
created in step 5 and map them to the cell. You can also configure a
periodic task to have Nova discover new hosts automatically by setting
the ``[scheduler]/discover_hosts_in_cells_interval`` to a time interval in
seconds.
seconds. The periodic task is run by the nova-scheduler service, so you must
be sure to configure it on all of your nova-scheduler hosts.
.. note:: Remember: In the future, whenever you add new compute hosts, you
will need to run the ``discover_hosts`` command after starting them
to map them to the cell if you did not configure the automatic host
discovery in step 7.
Upgrade (minimal)
~~~~~~~~~~~~~~~~~
@ -418,20 +425,22 @@ database. This will set up a single cell Nova deployment.
map the single cell, and map existing compute hosts and instances to the
single cell::
nova-manage cell_v2 simple_cell_setup --transport-url <transport url for
message queue>
nova-manage cell_v2 simple_cell_setup \
--transport-url <transport url for message queue>
The transport url is taken from the ``[DEFAULT]/transport_url`` setting in
the Nova configuration file if not specified on the command line. The
database connection url will be generated based on the
``[database]/connection`` setting in the Nova configuration file.
3. Remember: In the future, whenever you add new compute hosts, you will need
to run the ``discover_hosts`` command after starting them, to map them to
the cell. You can also configure a periodic task to have Nova discover new
hosts automatically by setting the
``[scheduler]/discover_hosts_in_cells_interval`` to a time interval in
seconds.
.. note:: Remember: In the future, whenever you add new compute hosts, you
will need to run the ``discover_hosts`` command after starting them
to map them to the cell. You can also configure a periodic task to
have Nova discover new hosts automatically by setting the
``[scheduler]/discover_hosts_in_cells_interval`` to a time interval
in seconds. The periodic task is run by the nova-scheduler service,
so you must be sure to configure it on all of your nova-scheduler
hosts.
References
~~~~~~~~~~