openstack/kolla-ansible
Code Issues Proposed changes
eb249b4fea
kolla-ansible/doc/source/reference/nova-fake-driver.rst
confi-surya dbf754655f Following the new PTI for document build 
For compliance with the Project Testing Interface [1]
as described in [2]

[1]
https://governance.openstack.org/tc/reference/project-testing-interface.html
[2]
http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html

doc8 command is dropped from docs tox envs.
So this affect nothing and run in PEP8.

Related-Bug: #1765348

Depends-On: Icc7fe3a8f9716281de88825e9d5b2fd84de3d00a
Change-Id: Idf9a16111479ccc64004eac9508da575822a3df5
2018-05-21 10:51:59 +01:00

1.5 KiB
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Nova Fake Driver

One common question from OpenStack operators is that "how does the control plane (for example, database, messaging queue, nova-scheduler ) scales?". To answer this question, operators setup Rally to drive workload to the OpenStack cloud. However, without a large number of nova-compute nodes, it becomes difficult to exercise the control performance.

Given the built-in feature of Docker container, Kolla enables standing up many of Compute nodes with nova fake driver on a single host. For example, we can create 100 nova-compute containers on a real host to simulate the 100-hypervisor workload to the nova-conductor and the messaging queue.

Use nova-fake driver

Nova fake driver can not work with all-in-one deployment. This is because the fake neutron-openvswitch-agent for the fake nova-compute container conflicts with neutron-openvswitch-agent on the Compute nodes. Therefore, in the inventory the network node must be different than the Compute node.

By default, Kolla uses libvirt driver on the Compute node. To use nova-fake driver, edit the following parameters in /etc/kolla/globals.yml or in the command line options.

enable_nova_fake: "yes"
num_nova_fake_per_node: 5

Each Compute node will run 5 nova-compute containers and 5 neutron-plugin-agent containers. When booting instance, there will be no real instances created. But nova list shows the fake instances.