Heat: the dashboard
When you select it you will see a list of the stacks that you have created, and to the top right, a button pair, one labelled "+ Launch Stack", the other "✖ Delete Stack":
Pressing the "+ Launch Stack" button creates a dialogue that invites you to provide a Heat template.
The dialogue offers you three ways of providing a template via the "Template Source" drop down:
URL- The template can be reached via a web browser, and you are going to provide the URL it can be found at;
File- You are going to upload the template from your local machine;
Direct Input- You will type the template in by hand.
Dependent on which selection you make in the "Template Source" drop down, the dialogue will reconfigure itself to allow you to provide the required information.
The dialogue also offers you the chance to provide an "Environment Source". This is also in the form of a drop down, but here the choices are limited to:
File- You are going to upload the environment from your local machine;
Direct Input- You will type the environment in by hand.
Again, dependant on which selection you make, the dialogue will reconfigure itself to allow you to provide the required information.
An environment simply allows you to provide parameter values and to define custom resources.
In this example we are going to use one of the NeCTAR Heat sample templates.
So in the Template Source field select "URL", then in the "Template URL" field enter:
Then in the Environment Source field select "Direct Input", then in the environment data edit box type the following
yaml (taking care to enter the correct values):
parameters: # your nectar keypair name instead of 'nectar_demo' key_name: nectar_demo # the latest nectar fedora image id fedora_image_id: db354243-aba2-4831-81c7-a155b9089291
Once you are done press the "Next" button.
All going well, you should now be presented with a page titled "Launch Stack". It will be a form that is made up of fields that are taken from your template's parameters.
Next to each field is a small question mark icon. As it gains focus, so the user will be shows the parameters comment field as a help bubble to the right.
The value entered into the "Stack Name" field is used to give a name to the stack that is going to be launched by Heat. This name must start with a letter and may only contain letters, numbers, underscores, full stops and hyphens...
The "Creation Timeout (minutes)" field is the number of minutes that should be allowed for the stack creation to take. If this time is exceeded then the stack creation will be aborted.
The "Rollback On Failure" field, if checked, will ensure that the complete stack gets deleted if there is a failure in creation. If it's not checked then you will have to manually delete the stack should there be a failure in the creation.
The rest of the fields are taken from the template that has been uploaded. You should find that the values you entered in the environment file have been used to fill the fields. Otherwise, simply provide the requested values then select the "Launch" button.
All going well, the stack should be created. Once created you can select it in the lists of stacks that are active, drilling down into its particular details.
When you are finished with a stack, you can simply hit the "Delete" button next to it on the stack listings. If you want to delete more than one stack, select the checkboxes next to them and hit the "✖ Delete Stack" button.