CentOS 7
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OpenStack Queens : How to use Heat
2018/03/11
 
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: 2018-03-02

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 |
+--------------------------------------+---------+--------+
| 88551fbc-ce7e-4719-a67a-dd7cad478019 | CentOS7 | active |
+--------------------------------------+---------+--------+
[root@dlp ~(keystone)]#
openstack network list 

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 56fba35e-e4c4-456b-9dc3-681db8ab73c5 | ext_net | a177a5db-723f-46fb-bd40-16619f55bd6d |
| fd95441f-4f15-418c-8a40-55a7c90d6a39 | int_net | b21b746b-1053-40b6-a2ba-bc08d3bc5d08 |
+--------------------------------------+---------+--------------------------------------+
[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                  | d78db9a6-672a-4f6a-a8ad-87277fd916c5 |
| stack_name          | Sample-Stack                         |
| description         | Heat Sample Template                 |
| creation_time       | 2018-03-12T04:42:44Z                 |
| 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 |
+-----------+--------------+---------------+-----------------+----------------------+--------------+
| d78db9a6- | Sample-Stack | 2551ca222f... | CREATE_COMPLETE | 2018-03-12T04:42:44Z | None         |
+-----------+--------------+---------------+-----------------+----------------------+--------------+
# the instance is running which is created from the Heat template

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

+-----------+----------------------+--------+-----------------------+---------+----------+
| ID        | Name                 | Status | Networks              | Image   | Flavor   |
+-----------+----------------------+--------+-----------------------+---------+----------+
| c2b7f1ca- | Heat_Deployed_Server | ACTIVE | int_net=192.168.100.5 | 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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