Create and manage stacks

Create a stack from an example template file
Get information about stacks
Update a stack

The template languages are described in the Template Guide in the Heat developer documentation.

Create a stack from an example template file

To create a stack, or template, from an example template file, run the following command:

$ heat stack-create mystack --template-file=/PATH_TO_HEAT_TEMPLATES/WordPress_Single_Instance.template
     --parameters="InstanceType=m1.large;DBUsername=USERNAME;DBPassword=PASSWORD;KeyName=HEAT_KEY;LinuxDistribution=F17"

The --parameters values that you specify depend on the parameters that are defined in the template. If a website hosts the template file, you can specify the URL with the --template-url parameter instead of the --template-file parameter.

The command returns the following output:

+--------------------------------------+---------------+--------------------+----------------------+
| id                                   | stack_name    | stack_status       | creation_time        |
+--------------------------------------+---------------+--------------------+----------------------+
| 4c712026-dcd5-4664-90b8-0915494c1332 | mystack       | CREATE_IN_PROGRESS | 2013-04-03T23:22:08Z |
+--------------------------------------+---------------+--------------------+----------------------+

You can also use the stack-create command to validate a template file without creating a stack from it.
To do so, run the following command:
```
$ heat stack-create mystack --template-file=/PATH_TO_HEAT_TEMPLATES/WordPress_Single_Instance.template
```
If validation fails, the response returns an error message.

Get information about stacks

To explore the state and history of a particular stack, you can run a number of commands.

To see which stacks are visible to the current user, run the following command:

$ heat stack-list
+--------------------------------------+---------------+-----------------+----------------------+
| id                                   | stack_name    | stack_status    | creation_time        |
+--------------------------------------+---------------+-----------------+----------------------+
| 4c712026-dcd5-4664-90b8-0915494c1332 | mystack       | CREATE_COMPLETE | 2013-04-03T23:22:08Z |
| 7edc7480-bda5-4e1c-9d5d-f567d3b6a050 | my-otherstack | CREATE_FAILED   | 2013-04-03T23:28:20Z |
+--------------------------------------+---------------+-----------------+----------------------+

To show the details of a stack, run the following command:
```
$ heat stack-show mystack
```

A stack consists of a collection of resources.

To list the resources and their status, run the following command:

$ heat resource-list mystack
+---------------------+--------------------+-----------------+----------------------+
| logical_resource_id | resource_type      | resource_status | updated_time         |
+---------------------+--------------------+-----------------+----------------------+
| WikiDatabase        | AWS::EC2::Instance | CREATE_COMPLETE | 2013-04-03T23:25:56Z |
+---------------------+--------------------+-----------------+----------------------+

To show the details for the specified resource in a stack, run the following command:
```
$ heat resource-show mystack WikiDatabase
```
Some resources have associated metadata which can change throughout the life-cycle of a resource:
```
$ heat resource-metadata mystack WikiDatabase
```

A series of events is generated during the life-cycle of a stack.

To display life-cycle events, run:

$ heat event-list mystack
+---------------------+----+------------------------+-----------------+----------------------+
| logical_resource_id | id | resource_status_reason | resource_status | event_time           |
+---------------------+----+------------------------+-----------------+----------------------+
| WikiDatabase        | 1  | state changed          | IN_PROGRESS     | 2013-04-03T23:22:09Z |
| WikiDatabase        | 2  | state changed          | CREATE_COMPLETE | 2013-04-03T23:25:56Z |
+---------------------+----+------------------------+-----------------+----------------------+

To show the details for a particular event, run the following command:
```
$ heat event-show WikiDatabase 1
```

Update a stack

To update an existing stack from a modified template file, run a command like the following command:

$ heat stack-update mystack --template-file=/path/to/heat/templates/WordPress_Single_Instance_v2.template
     --parameters="InstanceType=m1.large;DBUsername=wp;DBPassword=verybadpassword;KeyName=heat_key;LinuxDistribution=F17"
+--------------------------------------+---------------+-----------------+----------------------+
| id                                   | stack_name    | stack_status    | creation_time        |
+--------------------------------------+---------------+-----------------+----------------------+
| 4c712026-dcd5-4664-90b8-0915494c1332 | mystack       | UPDATE_COMPLETE | 2013-04-03T23:22:08Z |
| 7edc7480-bda5-4e1c-9d5d-f567d3b6a050 | my-otherstack | CREATE_FAILED   | 2013-04-03T23:28:20Z |
+--------------------------------------+---------------+-----------------+----------------------+

Some resources are updated in-place, while others are replaced with new resources.

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