Cloudify Nodecellar Example

This is a fork of the Cloudify Nodecellar Example.

It's main purpose is to demonstrate scaling a Node JS Webserver Backend with a Node JS Frontend.

Step 1: Upload the blueprint

cfy blueprints upload -b <choose_blueprint_id> -p <blueprint_filename>

Step 2: Create a deployment

Every one of these blueprints have inputs, which can be populated for a deployment using input files.
Example input files are located inside the inputs directory.
Note that these files only contain the mandatory inputs, i.e, one's that the blueprint does not define a default value for.

After you filled the input file corresponding to your blueprint, run:

cfy deployments create -b <blueprint_id> -d <choose_deployment_id> -i inputs/<inputs_filename>

Step 4: Install

Once the deployment is created, we can start running workflows:

cfy executions start -w install -d <deployment_id>

This process will create all the cloud resources needed for the application:

• VM's
• Floating IP's
• Security Groups

and everything else that is needed and declared in the blueprint.

Step 5: Verify installation

Once the workflow execution is complete, we can view the application endpoint by running:

cfy deployments outputs -d <deployment_id>

Hit that URL to see the application running.

Step 6: Demo the Auto Scale Example

Using the IP & PORT that are in the output of the command in Step 5, you can run:

ab -n 1000000 -c 200 http://$IP:$PORT/

This will increase the number of requests to the application. As a result the CPU used by the node process on the nodejs_host VMs will spike above the scale up threshold. This metric is monitored by the Diamond plugin, and the Riemann auto-scale policy calls the scale workflow trigger.

Killing this command should cause the CPU to drop below the scale down threshold, and the application will scale down.

Step 7:

You can simulate a failed host by stopping or suspending a running nodejs_host VM. The Riemann failed host policy will recognize the lack of system cpu metrics reporting on the host and will trigger the heal workflow.

Step 7: Uninstall

Now lets run the uninstall workflow. This will uninstall the application, as well as delete all related resources.

cfy executions start -w uninstall -d <deployment_id>

Step 8: Delete the deployment

Its best to delete deployments we are no longer using, since they take up memory on the management machine. We do this by running:

cfy deployments delete -d <deployment_id>