What a machine image is and why it matters
WHAT IT TESTS: understanding of immutable, reproducible infrastructure. OUTLINE: an image is a frozen template of OS, software, and config; it makes launches identical and fast. RED FLAG: confusing an image with a running instance or a live backup snapshot.
WHAT IT TESTS: whether you grasp images as the unit of reproducibility behind auto-scaling. ANSWER OUTLINE: a machine image, AMI on AWS, managed image or shared image gallery on Azure, custom image on GCP, is a frozen template containing the OS, installed software, and configuration. Launching from it produces identical instances quickly, which is what lets an auto-scaling group add capacity in seconds.
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- #ami
- #machine-image
- #immutable-infrastructure
- #auto-scaling
- #reproducibility
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