Yes the tool we've released today is for playing with and not production use. It's single host to keep things simple. Definitely agree for production use a multiple host cluster is essential for redundancy.

We think the faster launch times of containers makes auto scaling easier compared to using VMs. So our tool will prioritise the mix of running containers based on current demand.

To do this we'll need to support multiple metrics. Some of those will be within the cluster like CPU and RAM. But some may be external like the length of a message queue or requests per second on a load balancer.