instack-undercloud/doc/source/advanced_deployment/profile_matching.rst

Advanced Profile Matching

Here are additional setup steps to take advantage of the advanced profile matching and the AHC features.

Enable advanced profile matching

• Install the ahc-tools package:

  sudo yum install -y ahc-tools

• Add the credentials for Ironic and Swift to the /etc/ahc-tools/ahc-tools.conf file. These will be the same credentials that ironic-discoverd uses, and can be copied from /etc/ironic-discoverd/discoverd.conf:

  $ sudo -i
  # mkdir -p /etc/ahc-tools
  # sed 's/\[discoverd/\[ironic/' /etc/ironic-discoverd/discoverd.conf > /etc/ahc-tools/ahc-tools.conf
  # chmod 0600 /etc/ahc-tools/ahc-tools.conf
  # exit

  Example:

  [ironic]
  os_auth_url = http://192.0.2.1:5000/v2.0
  os_username = ironic
  os_password = <PASSWORD>
  os_tenant_name = service
  
  [swift]
  os_auth_url = http://192.0.2.1:5000/v2.0
  os_username = ironic
  os_password = <PASSWORD>
  os_tenant_name = service

Accessing additional introspection data

Every introspection run (as described in ../basic_deployment/basic_deployment_cli) collects a lot of additional facts about the hardware and puts them as JSON in Swift. Swift container name is ironic-inspector and can be modified in /etc/ironic-discoverd/discoverd.conf. Swift object name is stored under hardware_swift_object key in Ironic node extra field.

State file

Configuration file /etc/ahc-tools/edeploy/state defines how many nodes of each profile we want to match. This file contains list of tuples with profile name and number of nodes for this profile. * symbol can be used to match any number, but make sure that such tuple will go last.

For example to start with 1 control node and any number of compute ones, populate this file with the following contents:

[('control', '1'), ('compute', '*')]

Matching rules

These matching rules will determine what profile gets assigned to each node and are stored in files named /etc/ahc-tools/edeploy/PROFILE.specs for each profile defined in /etc/ahc-tools/edeploy/state.

Open the /etc/ahc-tools/edeploy/control.specs file. This is a JSON-like file that might look like this:

[
 ('disk', '$disk', 'size', 'gt(4)'),
 ('network', '$eth', 'ipv4', 'network(192.0.2.0/24)'),
 ('memory', 'total', 'size', 'ge(4294967296)'),
]

These rules match on the data collected during introspection. Note that disk size is in GiB, while memory size is in KiB.

There is a set of helper functions to make matching more flexible.

• network() : the network interface shall be in the specified network
• gt(), ge(), lt(), le() : greater than (or equal), lower than (or equal)
• in() : the item to match shall be in a specified set
• regexp() : match a regular expression
• or(), and(), not(): boolean functions. or() and and() take 2 parameters and not() one parameter.

There are also placeholders, $disk and $eth in the above example. These will store the value in that place for later use.

• For example if we had a "fact" from discovery:

  ('disk', 'sda', 'size', '40')

This would match the first rule in the above control.specs file, and we would store "disk": "sda".

Running advanced profile matching

• After adjusting the matching rules, we are ready to do the matching:

  sudo ahc-match

• This will attempt to match all of the available nodes to the roles we have defined in the /etc/ahc-tools/edeploy/state file. When a node matches a role, the role is added to the node in Ironic in the form of a capability. We can check this with ironic node-show:

  [stack@instack ~]# ironic node-show b73fb5fa-1a2c-49c6-b38e-8de41e3c0532 | grep properties -A2
  | properties             | {u'memory_mb': u'4096', u'cpu_arch': u'x86_64', u'local_gb': u'40',      |
  |                        | u'cpus': u'1', u'capabilities': u'profile:control,boot_option:local'}    |
  | instance_uuid          | None

• In the above output, we can see that the control profile is added as a capability to the node. Next we will need to create flavors in Nova that actually map to these profiles.

[Optional] Manually add the profiles to the nodes

In order to use the matching functionality without using the AHC tools. We can instead add the profile "tags" manually. The example below will add the "control" profile to a node:

ironic node-update <UUID> replace properties/capabilities='profile:control,boot_option:local'

Note

We can not update only a single key from the capabilities dictionary, so we need to specify both the profile and the boot_option above. Otherwise, the boot_option key will get removed.

Create flavors to use advanced matching

In order to use the profiles assigned to the Ironic nodes, Nova needs to have flavors that have the property "capabilities:profile" set to the intended profile.

For example, with just the compute and control profiles:

• Create the flavors

  openstack flavor create --id auto --ram 4096 --disk 40 --vcpus 1 control
  openstack flavor create --id auto --ram 4096 --disk 40 --vcpus 1 compute

Note

The values for ram, disk, and vcpus should be set to a minimal lower bound, as Nova will still check that the Ironic nodes have at least this much even if we set lower properties in the .specs files.

• Assign the properties

  openstack flavor set --property "cpu_arch"="x86_64" --property "capabilities:boot_option"="local" --property "capabilities:profile"="compute" compute
  openstack flavor set --property "cpu_arch"="x86_64" --property "capabilities:boot_option"="local" --property "capabilities:profile"="control" control

Use the flavors to deploy

By default, all nodes are deployed to the baremetal flavor. The RDO-Manager CLI has options to support more advanced role matching.

Continuing with the example with only a control and compute profile:

• Get the Tuskar plan name

  openstack management plan list

• Deploy the overcloud

  openstack overcloud deploy --control-flavor control --compute-flavor compute --plan <Name or UUID from above>

Use the flavors to scale

The process to scale an overcloud that uses our advanced profiles is the same as the process used when we only have the baremetal flavor.

Note

The original overcloud must have been deployed as above in order to scale using advanced profiles, as the flavor to role mapping happens then.

• Update the /etc/ahc-tools/edeploy/state file to match the number of nodes we want to match to each role.

• Run sudo ahc-match to match available nodes to the defined roles.

• Scale the overcloud (example below adds two more nodes to the compute role)

  openstack overcloud scale stack overcloud overcloud -r Compute-1 -n 2