How can the organization achieve this with a single instance?
You have to launch two instances each in a separate subnet and allow VPC peering for a single IP.
Create a VPC instance which will have multiple network interfaces with multiple elastic IP addresses.
Create a VPC instance which will have both the ACL and the security group attached to it and have separate rules for each IP address.
Create a VPC instance which will have multiple subnets attached to it and each will have a separate IP address.
Explanations:
Launching two instances in separate subnets requires more resources and does not directly address the need for separate SSL certificates on a single EC2 instance. VPC peering is unnecessary in this scenario as it’s meant for connecting different VPCs, not managing SSL configurations.
Creating a single EC2 instance with multiple network interfaces allows for multiple Elastic IP addresses, enabling the configuration of separate SSL certificates for each application component hosted on the same instance. This setup allows the same instance to handle different SSL traffic securely.
While it’s possible to attach both ACLs and security groups to a single instance, this does not provide a way to implement separate SSL certificates for different modules, as SSL termination still needs to be configured per IP address or hostname, which cannot be achieved through ACL and security group rules alone.
Creating multiple subnets attached to a single instance does not directly enable separate SSL certificates. Each subnet would still resolve to the same instance, which limits the ability to separate SSL traffic effectively. Additionally, an instance can only have one private IP address, limiting how subnets could be utilized.
If I had to guess, I’d say the answer is:
Create a VPC instance which will have multiple network interfaces with multiple elastic IP addresses.