Maintaining multiple runtime environments

In a real-world scenario, you'll need multiple environments to avoid pushing broken features or major bugs to a sandbox or staging environment (or worse, a production environment) before validating them.

You can create an EC2 instance to host the staging environment by running a new EC2 instance based on the sandbox environment we created in previous chapters:

1. Select the sandbox instance and click on Actions from the action bar. Then, click on Launch more like this from the Image and template drop-down list:

   Figure 9.25 – Replicating the sandbox environment

   This option will automatically populate the Amazon EC2 launch wizard with configuration details from the selected instance.

2. Update the Name tag value to staging and click on Launch to provision the instance:

   Figure 9.26 – Staging environment running in an EC2 instance

3. Once the instance is up and running, update CircleCI so that it tags the Docker image...