CentOS 7
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OpenStack Train : How to use Heat2019/10/28

 
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 |
+--------------------------------------+---------+--------+
| c742c8ed-9d0f-4555-9844-7f063a0b585f | CentOS7 | active |
+--------------------------------------+---------+--------+

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

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 08ba2a6b-a9e6-41cd-b530-ffecb146117e | int_net | 7e35d8e7-4f75-4afd-ab9f-da5ccf6850fc |
| f6440530-1b12-4748-a557-3596e36a42ec | ext_net | c2db3338-39cf-4529-8c7e-8680db716475 |
+--------------------------------------+---------+--------------------------------------+

[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                  | 07ac50a1-e5ff-4843-b611-083ecdbf8240 |
| stack_name          | Sample-Stack                         |
| description         | Heat Sample Template                 |
| creation_time       | 2019-10-28T06:44:59Z                 |
| 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 |
+--------------------------------------+--------------+----------------------------------+-----------------+----------------------+--------------+
| 07ac50a1-e5ff-4843-b611-083ecdbf8240 | Sample-Stack | 4f93fd3e6e184c859641b017115016a4 | CREATE_COMPLETE | 2019-10-28T06:44:59Z | None         |
+--------------------------------------+--------------+----------------------------------+-----------------+----------------------+--------------+

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

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

+--------------------------------------+----------------------+--------+------------------------+---------+----------+
| ID                                   | Name                 | Status | Networks               | Image   | Flavor   |
+--------------------------------------+----------------------+--------+------------------------+---------+----------+
| cb5f445b-3a68-4780-a6b2-26769cc7670a | Heat_Deployed_Server | ACTIVE | int_net=192.168.100.67 | CentOS7 | m1.small |
+--------------------------------------+----------------------+--------+------------------------+---------+----------+

# delete the instance

[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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