21. Compute Services
ND0063 C1 L2 14 AWS Computer Services Video
AWS offers several options for compute resources. EC2, Lambda and various container services are a few of them. These resources are similar to server based services in that they are not Multi-AZ by default, but with some work, they can be made to be.
EC2 instances can be run as a group with an AutoScaling Group and that AutoScaling Group can be capable of running in multiple AZs. If the EC2 instances are serving incoming HTTP requests, they can be put behind an Elastic Load Balancer, which can also be configured to span AZs.
AWS Lambda has different connectivity modes. If you have a Lambda that does not need to access your VPCs, then it can run independently. If your Lambda does need to access a VPC resource, then it needs to be configured to do so, and part of this configuration can be to allow the Lambda to connect to different AZs (subnets).