CentOS 7
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OpenStack Rocky : How to use Heat
2018/09/04
 
How to use the OpenStack Orchestration Service (Heat).
This example is based on the emvironment like follows.
------------+---------------------------+---------------------------+------------
            |                           |                           |
        eth0|10.0.0.30              eth0|10.0.0.50              eth0|10.0.0.51
+-----------+-----------+   +-----------+-----------+   +-----------+-----------+
|    [ Control Node ]   |   |    [ Network Node ]   |   |    [ Compute Node ]   |
|                       |   |                       |   |                       |
|  MariaDB    RabbitMQ  |   |      Open vSwitch     |   |        Libvirt        |
|  Memcached  httpd     |   |        L2 Agent       |   |     Nova Compute      |
|  Keystone   Glance    |   |        L3 Agent       |   |      Open vSwitch     |
|  Nova API             |   |     Metadata Agent    |   |        L2 Agent       |
|  Neutron Server       |   |     Cinder Volume     |   |                       |
|  Metadata Agent       |   |   Heat API   API-CFN  |   |                       |
|  Cinder API           |   |   Heat Engine         |   |                       |
+-----------------------+   +-----------------------+   +-----------------------+

[1] Deploy Instances with Heat services and templates. The example below is on the Controle Node.
# create a template for test

[root@dlp ~(keystone)]#
vi sample-stack.yml
heat_template_version: 2018-08-31

description: Heat Sample Template

parameters:
  ImageID:
    type: string
    description: Image used to boot a server
  NetID:
    type: string
    description: Network ID for the server

resources:
  server1:
    type: OS::Nova::Server
    properties:
      name: "Heat_Deployed_Server"
      image: { get_param: ImageID }
      flavor: "m1.small"
      networks:
      - network: { get_param: NetID }

outputs:
  server1_private_ip:
    description: IP address of the server in the private network
    value: { get_attr: [ server1, first_address ] }

[root@dlp ~(keystone)]#
openstack image list

+--------------------------------------+---------+--------+
| ID                                   | Name    | Status |
+--------------------------------------+---------+--------+
| 05269b20-9625-46b6-8377-3893c70906bd | CentOS7 | active |
+--------------------------------------+---------+--------+

[root@dlp ~(keystone)]#
openstack network list

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 2f05bc33-a661-4882-b6f3-857d14f37165 | int_net | d6c87a6c-b773-473c-8371-4220594eff2c |
| b2873d6d-3081-49f2-a893-0fa135962c9c | ext_net | 7dd8e915-6885-4ecb-8157-41e6de0b6498 |
+--------------------------------------+---------+--------------------------------------+

[root@dlp ~(keystone)]#
Int_Net_ID=$(openstack network list | grep int_net | awk '{ print $2 }')
# create an instance from the template

[root@dlp ~(keystone)]#
openstack stack create -t sample-stack.yml --parameter "ImageID=CentOS7;NetID=$Int_Net_ID" Sample-Stack

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| id                  | 5b5cecec-b258-4392-a557-022f171e4b0f |
| stack_name          | Sample-Stack                         |
| description         | Heat Sample Template                 |
| creation_time       | 2018-09-04T04:16:19Z                 |
| updated_time        | None                                 |
| stack_status        | CREATE_IN_PROGRESS                   |
| stack_status_reason | Stack CREATE started                 |
+---------------------+--------------------------------------+

# turn to [CREATE_COMPLETE] after few minutes later like follows

[root@dlp ~(keystone)]#
openstack stack list

+--------------------------------------+--------------+----------------------------------+-----------------+----------------------+--------------+
| ID                                   | Stack Name   | Project                          | Stack Status    | Creation Time        | Updated Time |
+--------------------------------------+--------------+----------------------------------+-----------------+----------------------+--------------+
| 5b5cecec-b258-4392-a557-022f171e4b0f | Sample-Stack | 2cb4b9d73bcc46449f711794506c3faf | CREATE_COMPLETE | 2018-09-04T04:16:19Z | None         |
+--------------------------------------+--------------+----------------------------------+-----------------+----------------------+--------------+

# the instance is running which is created from the Heat template

[root@dlp ~(keystone)]#
openstack server list

+--------------------------------------+----------------------+--------+-----------------------+---------+----------+
| ID                                   | Name                 | Status | Networks              | Image   | Flavor   |
+--------------------------------------+----------------------+--------+-----------------------+---------+----------+
| 0e04e4c6-ed4d-480d-b14f-0a506c27412c | Heat_Deployed_Server | ACTIVE | int_net=192.168.100.4 | CentOS7 | m1.small |
+--------------------------------------+----------------------+--------+-----------------------+---------+----------+

# delete the instance likwe follows if you don't need

[root@dlp ~(keystone)]#
openstack stack delete --yes Sample-Stack

[root@dlp ~(keystone)]#
openstack stack list
[root@dlp ~(keystone)]#
openstack server list


[2]
The guide for writing templates are opened on the official site below.
⇒ https://docs.openstack.org/heat/latest/template_guide/index.html
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