CentOS 7
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OpenStack Ocata : How to use Heat
2017/03/05
 
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,L3,Metadata Agent |        |      Nova Compute     |
     |  Keystone   Glance    |        |  Heat API   API-CFN   |        |      Open vSwitch     |
     |  Nova API             |        |  Heat Engine          |        |        L2 Agent       |
     |  Neutron Server       |        |                       |        |                       |
     +-----------------------+        +-----------------------+        +-----------------------+

[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: 2017-02-24

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 |
+--------------------------------------+---------+--------+
| c13b45a8-5664-4169-93c7-625ae2e561e9 | CentOS7 | active |
+--------------------------------------+---------+--------+

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

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 0caa61ce-db39-44dc-9c54-a50bb48fae08 | ext_net | a3cc573a-8066-49a1-bf0e-21ed53595452 |
| e82354f3-7820-421f-b8d6-0b67ff26f5c2 | int_net | 4a0d9278-6b06-4809-9b35-e7facff737d2 |
+--------------------------------------+---------+--------------------------------------+

[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                  | 2a274806-0756-4e18-9b87-20ae93175345 |
| stack_name          | Sample-Stack                         |
| description         | Heat Sample Template                 |
| creation_time       | 2017-03-05T09:48:09Z                 |
| 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   | Stack Status    | Creation Time        | Updated Time |
+--------------------------------------+--------------+-----------------+----------------------+--------------+
| 2a274806-0756-4e18-9b87-20ae93175345 | Sample-Stack | CREATE_COMPLETE | 2017-03-05T09:48:09Z | None         |
+--------------------------------------+--------------+-----------------+----------------------+--------------+

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

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

+-----------+----------------------+---------+-----------------------------------+------------+
| ID        | Name                 | Status  | Networks                          | Image Name |
+-----------+----------------------+---------+-----------------------------------+------------+
| 6c97e6c5- | Heat_Deployed_Server | ACTIVE  | int_net=192.168.100.6             | CentOS7    |
| b17e0565- | CentOS_7             | SHUTOFF | int_net=192.168.100.5, 10.0.0.201 | CentOS7    |
+-----------+----------------------+---------+-----------------------------------+------------+

# 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 Name |
+-----------+----------------------+---------+-----------------------------------+------------+
| b17e0565- | CentOS_7             | SHUTOFF | int_net=192.168.100.5, 10.0.0.201 | CentOS7    |
+-----------+----------------------+---------+-----------------------------------+------------+
[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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