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.
- 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
2. Installing the Blueprint
Use the following commands to change directory and begin the install process:
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
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:
You should see the following output in your terminal:
<title>Cloudify Hello World</title>
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