Matt Riedemann e8653f28de doc: remove deprecated [neutron]/url from compute install guide

The nova [neutron]/url config option was deprecated in Queens [1]
and is being removed in Train [2]. The neutron install guide
sections about configuring compute to work with neutron were still
using the url option so this change removes them. There are a few
things to note here:

1. The url option functionality is replaced with the endpoint_override
   option from keystoneauth1 but we don't really want users using that
   unless there is a real need. One of the main reasons for moving the
   nova configuration to use keystoneauth1 was so that the network
   service endpoint can be looked up via KSA dynamically based on the
   configurable interfaces (public, internal, private) and service types
   authority so the endpoint URL will just be pulled from the service
   catalog. That means not having to hard-code the endpoint URL in nova
   config which makes deployment and config management simpler. As such,
   the url option removed in the install guide here is not replaced with
   the endpoint_override option.

2. Following on #1, the install guide portion about the nova/neutron config
   is updated with a link back to the nova config guide for the full set
   of options in case an operator needs to tweak the config, e.g. to set
   valid_interfaces or endpoint_override because the KSA defaults don't work
   for their deployment.

3. With the old url option, if region_name was not specified, nova would
   default to 'RegionOne'. That is not the case if not using the url option
   so we leave the region_one config in the install guide example, otherwise
   region_name would default to None.

[1] I41724a612a5f3eabd504f3eaa9d2f9d141ca3f69
[2] I6c068a84c4c0bd88f088f9328d7897bfc1f843f1

Change-Id: I30445edeb8509330571db28c7d61dd63886e9e61
Closes-Bug: #1840930

2019-08-21 16:09:09 -04:00

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Install and configure compute node

The compute node handles connectivity and security groups for instances.

Install the components

# apt install neutron-linuxbridge-agent

Configure the common component

The Networking common component configuration includes the authentication mechanism, message queue, and plug-in.

Edit the /etc/neutron/neutron.conf file and complete the following actions:
- In the [database] section, comment out any connection options because compute nodes do not directly access the database.
- In the [DEFAULT] section, configure RabbitMQ message queue access:
```
[DEFAULT]
# ...
transport_url = rabbit://openstack:RABBIT_PASS@controller
```
  Replace RABBIT_PASS with the password you chose for the openstack account in RabbitMQ.
- In the [DEFAULT] and [keystone_authtoken] sections, configure Identity service access:
```
[DEFAULT]
# ...
auth_strategy = keystone

[keystone_authtoken]
# ...
www_authenticate_uri = http://controller:5000
auth_url = http://controller:5000
memcached_servers = controller:11211
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = neutron
password = NEUTRON_PASS
```
  Replace NEUTRON_PASS with the password you chose for the neutron user in the Identity service.
  
  Note
  
  Comment out or remove any other options in the [keystone_authtoken] section.

In the [oslo_concurrency] section, configure the lock path:

[oslo_concurrency]
# ...
lock_path = /var/lib/neutron/tmp

Configure networking options

Choose the same networking option that you chose for the controller node to configure services specific to it. Afterwards, return here and proceed to neutron-compute-compute-ubuntu.

compute-install-option1-ubuntu.rst compute-install-option2-ubuntu.rst

Configure the Compute service to use the Networking service

Edit the /etc/nova/nova.conf file and complete the following actions:
- In the [neutron] section, configure access parameters:
```
[neutron]
# ...
auth_url = http://controller:5000
auth_type = password
project_domain_name = default
user_domain_name = default
region_name = RegionOne
project_name = service
username = neutron
password = NEUTRON_PASS
```
  Replace NEUTRON_PASS with the password you chose for the neutron user in the Identity service.
  
  See the compute service configuration guide <configuration/config.html#neutron> for the full set of options including overriding the service catalog endpoint URL if necessary.

Finalize installation

Restart the Compute service:
```
# service nova-compute restart
```

Restart the Linux bridge agent:

# service neutron-linuxbridge-agent restart

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