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OpenStack Newton : How to use Heat
2016/10/27
 
How to use the OpenStack Orchestration Service (Heat).
This example is based on the environment like follows. 
                                |
+------------------+            |            +------------------------+
| [ Control Node ] |            |            |    [ Network Node ]    |
|     Keystone     |10.0.0.30   |   10.0.0.50|    DHCP,L3,L2 Agent    |
|      Glance      |------------+------------|     Metadata Agent     |
|     Nova API     |eth0        |        eth0|    Heat API,API-CFN    |
|  Neutron Server  |            |            |       Heat Engine      |
+------------------+            |            +------------------------+
                            eth0|10.0.0.51
                      +--------------------+
                      |  [ Compute Node ]  |
                      |    Nova Compute    |
                      |      L2 Agent      |
                      +--------------------+
[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: 2016-10-14

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 |
+--------------------------------------+---------+--------+
| 0f695de0-2bf6-4a51-93ea-0c87ac6a3d07 | CentOS7 | active |
+--------------------------------------+---------+--------+
[root@dlp ~(keystone)]#
openstack network list 

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 57841132-2c12-4a8b-b29f-2249eba54471 | ext_net | ea9dfc41-16e9-4f6b-8cd0-6024c3299488 |
| cb956039-19e4-49d2-b2d3-6a1327c7b691 | int_net | 303fbd3b-eb58-48e7-9508-f74a55e0f3be |
+--------------------------------------+---------+--------------------------------------+
[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                  | 49378d71-0664-4eb1-8536-fa7f0a2adeab |
| stack_name          | Sample-Stack                         |
| description         | Heat Sample Template                 |
| creation_time       | 2016-10-28T01:47:39Z                 |
| 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 |
+--------------------------------------+--------------+-----------------+----------------------+--------------+
| 49378d71-0664-4eb1-8536-fa7f0a2adeab | Sample-Stack | CREATE_COMPLETE | 2016-10-28T01:47:39Z | None         |
+--------------------------------------+--------------+-----------------+----------------------+--------------+
# the instance is running which is created from the Heat template

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

+-----------+----------------------+---------+------------------------------------+------------+
| ID        | Name                 | Status  | Networks                           | Image Name |
+-----------+----------------------+---------+------------------------------------+------------+
| 46a421d9- | Heat_Deployed_Server | ACTIVE  | int_net=192.168.100.10             | CentOS7    |
| e5a31503- | CentOS_7             | SHUTOFF | int_net=192.168.100.11, 10.0.0.200 | 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
[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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