Images

With resources provisioned, the next step is to create an Amazon Machine Image (AMI) with Ubuntu OS as the foundation for all server instances.

Creating an Image

yolo image:create <environment>

Images can be updated over time to bring in improvements like new PHP versions.

Staging

To prepare a new stage, run:

yolo stage <environment>

This interactive command walks you through updating or replacing the current stage configuration.

Update vs Create

Situation	Recommended strategy
Update EC2 security group	Update
Update EC2 instance type	Update
Update EC2 instance profile	Update
Update AMI	Create

When creating a new stage, the yolo.yml manifest is updated to point to the new autoscaling groups on the next deployment.

TIP

Rotating in a new image has no impact on existing traffic until the updated manifest is deployed. The previous deployment continues serving requests and autoscaling as normal.