Elastic Beanstalk Deploymemt Modes

All at once(deploy all in one go)

fastest, but instances aren't available to serve traffic for a bit(downtime)
Great for quick iterations in development environment
가장 빠르다. 잠깐 서버 다운타임이 생긴다.
Rolling
update a few instances at a time(bucket), and then move onto the next bucket once the first bucket is healthy
Application is running below capacity
can set the bucket size
Application is running both versions simultaneously
no additional cost
long deployment
Rolling with additional batches
like rolling, but spins up new instances to move the batch(so that the old application is still available)
Immutable
spins up new instances in a new ASG, deploys version to these instances, and then swaps all the instances when everyting is healty
Blue / Green