CentOS 7
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OpenStack Pike : How to use Heat
2017/09/07
 
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: 2017-09-01

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 |
+--------------------------------------+---------+--------+
| 68132026-60aa-4afe-8976-398b0482cfd6 | CentOS7 | active |
+--------------------------------------+---------+--------+

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

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| b70e8cdc-8c61-4a3b-8dfc-060cba8f82f9 | int_net | 3627d5d7-8196-469f-897e-2159f695052a |
| e27d7f02-773f-4e11-8aa9-e70ebc05ab76 | ext_net | 85f3a6a0-07ab-493d-91a3-cd60ecd908c7 |
+--------------------------------------+---------+--------------------------------------+

[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                  | f9130fe1-e40b-4c90-baaf-66a6f48ec1bc |
| stack_name          | Sample-Stack                         |
| description         | Heat Sample Template                 |
| creation_time       | 2017-09-08T08:14:12Z                 |
| 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 |
+-----------+--------------+---------------+-----------------+----------------------+--------------+
| f9130fe1- | Sample-Stack | 09158bee8c... | CREATE_COMPLETE | 2017-09-08T08:14:12Z | None         |
+-----------+--------------+---------------+-----------------+----------------------+--------------+

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

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

+-----------+----------------------+---------+------------------------------------+---------+----------+
| ID        | Name                 | Status  | Networks                           | Image   | Flavor   |
+-----------+----------------------+---------+------------------------------------+---------+----------+
| bf95857b- | Heat_Deployed_Server | ACTIVE  | int_net=192.168.100.11             | CentOS7 | m1.small |
| 662f62b8- | CentOS_7             | SHUTOFF | int_net=192.168.100.12, 10.0.0.201 | 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

+-----------+----------+---------+------------------------------------+---------+----------+
| ID        | Name     | Status  | Networks                           | Image   | Flavor   |
+-----------+----------+---------+------------------------------------+---------+----------+
| 662f62b8- | CentOS_7 | SHUTOFF | int_net=192.168.100.12, 10.0.0.201 | CentOS7 | m1.small |
+-----------+----------+---------+------------------------------------+---------+----------+
[2]
The guide for writing templates are opened on the official site below.
⇒ http://docs.openstack.org/developer/heat/template_guide/index.html
 
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