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- In order to add an AZ(s) to a VPC, you would create new subnet(s) from existing space in your VPC's CIDR block, choosing the desired AZ in the process
- If your VPC has run out of address space, you would need to either delete some subnets, or add secondary CIDR block to your VPC. We have a guide on adding a CIDR block here: https://aws.amazon.com/premiumsupport/knowledge-center/vpc-modify-cidr-more-hosts/
- This process does not involve any downtime.
- As for your existing workload running in single AZ you have some options listed in the below article
https://aws.amazon.com/premiumsupport/knowledge-center/move-ec2-instance/
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