Cannot create a vpc endpoint in a region other than us-east-1

Question

I have code that looks something like this:

```
ec2 = boto3.client("ec2", region_name='us-east-1')
endpoint = ec2.create_vpc_endpoint(
        VpcId=vpc.id,
        VpcEndpointType="Gateway",
        ServiceName=VPC_S3_ENDPOINT,
        RouteTableIds=rtb_id_list
)
```

The vpc referenced here has been previously created in the us-east-1 region. The create_vpc_endpoint call works fine, creating the S3 endpoint as expected in us-east-1. If I change the region though to us-east-2 for both my vpc and the create_vpc_endpoint, call, I get this error:

```
botocore.exceptions.ClientError: An error occurred (InvalidServiceName) when calling the CreateVpcEndpoint operation: The Vpc Endpoint Service 'com.amazonaws.us-east-1.s3' does not exist
```

I get a similar error when creating an endpoint for DynamoDB.  
  
I've tried various alternatives but nothing works. What's the correct way to create a vpc endpoint in a region other than us-east-1?

Answer

D'oh. This definitely falls into the category of user error. I'd completely forgot that the constant VPC_S3_ENDPOINT was one of my own creation, part of my original project from several months ago. It was set to

```
com.amazonaws.us-east-1.s3
```

and that of course is why I was getting the region error.   
I'll change my constant definition to

```
VPC_S3_ENDPOINT = "com.amazonaws.{}.s3"
```

and inject the region into this constant before making the api call.  
  
Edited by: pwsteele on Jan 4, 2019 1:13 PM

Cannot create a vpc endpoint in a region other than us-east-1

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