Is it possible to utilize OCI services from a private subnet with only a Service Gateway and no internet access?

Utilizing OCI services from a private subnet with only a Service Gateway and no internet access is indeed feasible, making the selected answer valid.

When you configure a Service Gateway in Oracle Cloud Infrastructure (OCI), it allows resources in a private subnet to communicate with specific Oracle services without the need for an internet connection. This is crucial for maintaining the security posture of your architecture because it enables direct routing to Oracle services, such as Object Storage, Autonomous Database, and others, directly from a private subnet.

Routing rules play a significant role here since they define how traffic is directed in your virtual cloud network (VCN). By configuring the appropriate routing to your Service Gateway, you can ensure that requests to Oracle services are properly routed without requiring a public IP or an internet gateway.

The implications of the other options clarify further why they are not suitable. The notion that only certain services can be accessed is incorrect because the Service Gateway is designed to provide access to a broad range of OCI services available within the private subnet. The belief that a public IP is always required negates the purpose of a Service Gateway—it specifically allows access without a public endpoint. Similarly, while a NAT gateway is indeed necessary for scenarios where you need to access the internet from a private subnet, it