Evaluating Cloudify

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This section will assist you in evaluating Cloudify through the deployment of a simple web application.

Deploying a Simple Hello World Web Server

This procedure enables you to deploy a simple ‘Hello World’ Web server. You must have Cloudify CLI installed in order to run this evaluation process.

Now that you have installed Cloudify CLI, it is time to get a glimpse of what it can do. In this procedure you:

Download and extract a sample blueprint from the Cloudify Sample repository.
Deploy the Web application blueprint locally by executing an install workflow.
Access and confirm the ‘Hello World’ message.
Optional: Retrieve the outputs of the installation.
Optional: List the node instances that are part of the installation.
Remove the Web application by executing an uninstall workflow.

PREREQUISITES:

Git installed: https://git-scm.com/book/en/v2/Getting-Started-Installing-Git
Ensure port 8000 is open

1. Downloading and Extracting the Blueprint

Use the following command to clone the repo and extract the installation.
$ git clone https://github.com/cloudify-examples/local-simple-python-webserver-blueprint.git
The process creates a directory called local-simple-python-webserver-blueprint.

2. Installing the Blueprint

Use the following commands to change directory and begin the install process:
cd local-simple-python-webserver-blueprint
cfy install blueprint.yaml

You might be prompted to provide permission to listen on the localhost.
If the install fails, or the Website does not appear, you might need to open your firewall.

You should see the following output once done.
$ cfy install blueprint.yaml
Initializing local profile ...
Initialization completed successfully
Initializing blueprint...
Initialized blueprint.yaml

2017-03-28 10:53:01.736 CFY <local-simple-python-webserver-blueprint> 'install' workflow execution succeeded

3. Confirming the Application is Working

To confirm the application is working, try accessing it.

To access the application locally, run: curl http://localhost:8000

You should see the following output in your terminal: <html>
<header>
<title>Cloudify Hello World</title>
</header>
<body>
<h1>Hello, World!</h1>
<img src="cloudify-logo.png">
</body>
</html>
To test the application in a browser go to http://localhost:8000, and you should see the following:

4. Optional: Retrieving Node Instances

Each logical entity in your application that is defined within a blueprint is a called a node. After a deployment is created, each logical node becomes a set of one or more node-instances, which are instances of that node. A node can have multiple node-instances, such as multiple virtual machines.

Run the following command to view each node that is defined in the blueprint, and its attributes. cfy node-instances list -b local-simple-python-webserver-blueprint

5. Optional: Retrieving the Installation Outputs

When you install a blueprint with Cloudify, a deployment is created. A deployment is a model of the application that will be modified over the Application lifecycle, including all of the node-instances and their runtime properties. A deployment also has outputs, which can be the IP addresses, ports, or other runtime-properties generated during Cloudify workflows, that you want to take and use somewhere else.

Run the following command to retrieve the outputs:
cfy deployments outputs -b local-simple-python-webserver-blueprint

6. Uninstalling a Deployed Blueprint

An uninstall workflow that enables you to uninstall the application.

To uninstall the application, run cfy uninstall -b local-simple-python-webserver-blueprint.
The following output is expected: $ cfy uninstall
2017-03-28 10:53:12.765 CFY <local-simple-python-webserver-blueprint> Starting 'uninstall' workflow execution

2017-03-28 10:53:15.154 CFY <local-simple-python-webserver-blueprint> 'uninstall' workflow execution succeeded

This completes the deployment of your first application. You have processed an entire application lifecycle workflow using Cloudify.

To try Cloudify in a hosted environment for more complex applications, check out the Cloudify Labs