Appengine

App Engine is regional * Reduntly available across all the zones within that region

Standard Environment¶

Managed runtime for specific versions of Java, Python, PHP and GO
Rapid automatic scaling to meet spikes in demand
Runs in secure sandboxed env
More restrictions than Flexible env
- Can not write to local file system or modify runtime
Charged on instance hours (how often it's used) - Machine type not calculated
Faster scale up time (seconds)
More constrainsts
Intend to run for free or very low cost
- Only pay for what you need when you need it
- If no traffic, no instances in use

Based on Compute Engine
Autoscale based on load
Native support for Java, Jetty, Python, Node.js, Ruby, PHP, .Net, and go
- or provide own runtime by supplying own docker image
Customize infrastructure: Custom libraries, use SSH, or use own docker containers
- Specify CPU/Memory config
Charged by CPU/Memory/Storage
Compared to Compute Engine:
- Instances are automatically updated/patched
- Health check hadled for you
- Regional placemnet handled for you for optimal performance
- Root SSH disabled by default but can be enabled
Slower scale up time I Consistent traffic, gradual scale up /down
Load OS dependent packages