I currently have a AWS REST API gateway setup with a VPC Link. Im having issues where the API gateway is not passing my Host header to an internal application. The Endpoint URL is a private DNS name that the API gateway is unable to resolve.
Is it possible to pass through the host header of an internal domain name ? Looking to do this with out Lambda Integration.
When i do a postman call to the API gateway and add the host header of my private URL it just fails.
If i target the VPC Link NLB via postman the call works.
If i choose HTTP as my integration type i am unable to add a private DNS name.
Related
Using AWS Direct Connect, we've built a network between our on-premise and our AWS VPC. We've developed a web application that users will access from within the on-prem network. We're using the HTTP API Gateway, which uses a VPC Link to connect to the private ALB. We've used a Custom Domain Name with the HTTP API Gateway and disabled the default endpoint. The domain name is registered in a private hosted zone on Route 53.
We want to keep all the traffic between the clients and the API Gateway within our private network. However, we can see that the requests going to the HTTP API Gateway leave our network because the custom domain name for the API Gateway resolves to a public IP address.
Is there a way to assign a private IP address to the HTTP API Gateway? Or any other way to keep the traffic within our network?
One option is to switch to the REST API Gateway and make its endpoint type Private. However, the HTTP API Gateway suits our needs much better with its simplicity. It also has the option for connectivity to an ALB using VPC Link, which the REST Gateway lacks.
Sadly no, the HTTP APIs do not support Private APIs. Whatever solution you will use, HTTP API endpoint must be public.
You have to use REST API, or create your own fully custom solution if REST API is out of question.
I want to provide an update to this topic.
AWS updated its product and private endpoints are available right now.
AWS - Private API endpoint
There are also a couple of examples out there also for CDK, Cloudformation or management console.
I hope this helps
I want to use API Gateway to route between multiple microservices. E.g: domain.com/app1, domain.com/app2 etc.
Each service has an internal Application Load Balancer (ALB).
API Gateway has a VPC Link configured correctly.
The problem is that routes such as domain.com/app1/hello are redirected to internal.app1/app1/hello instead of internal.app1/hello.
Notice that the prefix app1 is not removed.
It can be solved when I use HTTP redirection in API Gateway, but that requires an external load balancer which I want to avoid. I didn't see an option to use path variables with private ALB integration.
Please advise. Thank you in advance.
Problem is solved.
The solution is to use a REST API Gateway (instead of HTTP Gateway) integrated with a Network Load Balancer (NLB) via a VPC Link.
The AWS REST API in AWS API Gateway allows using path variables with private integration (in this case, the NLB).
Summary of the solution:
API Gateway REST API
Private Network Load Balancer
REST API VPC Link (to the NLB)
Use a proxy resource with private integration in the routes configuration
I am deploying API gateway and Lambda functions on AWS. The API gateway has an auto generated endpoint url. And I have a domain name managed by Route53 DNS which points to the gateway URL. One of my lambda needs to send requests to the API gateway in the same AWS region. My question is that should I use the auto-generated API gateway endpoint or DNS domain name in my labmda?
You can use both but there are some points that you can consider where DNS is better in term of changes aws resources.
By using DNS you've more flexibility like if you made changes API gateway and the endpoint change because of some reason you don't need to update code, all you need to update route53 record to point new API gateway endpoint as a result no change will be required on code and lambda will request to the new endpoint.
You can update DNS during maintenance and still no changes will be required in the code side, there can be many options as DNS gives you flexibility.
During DNS configuration make sure you are using aliases for AWS endpoint as AWS redirect queries to selected AWS resources, unlike CNAME where redirect DNS queries to any DNS record.
resource-record-sets-choosing-alias-non-alias
AWS Document says,
Custom domain names are not supported for private APIs.
Source: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-private-apis.html
What does this exactly mean? I am able to attach a custom domain name to the Private API.
However I am facing issues with SSL Certificates.
API Gateway has 4 options:
HTTP API
WebSockets API
REST API
REST API Private
REST API Private is the same as REST APIs except it is only accessible from within a VPC. To access the REST API from within the VPC an interface VPC endpoint is required. If you do not use an interface VPC endpoint then you can access the REST API on API Gateway via NAT which goes via the internet gateway or just an internet gateway. In either case this would be a public REST API over the internet.
When using the VPC interface endpoint, AWS generates a custom domain name. This domain name is used within the VPC to locate the endpoint and redirect to the REST API. For this reason you cannot specify your own custom domain name at this time. You can specify a custom domain name for a public facing REST API.
Because you cannot specify your own custom domain name, you cannot use your own custom certificates.
Because the VPC interface endpoint is called API Gateway internally TLS 1.2 is used. This cannot be changed either.
If you want to use your own certificates, then you would need to define your own domain name, and use a public facing REST API defined in API Gateway.
Alternatively you could use a custom domain name internal to your VPC, generate a certificate for this domain name. Put the certificate on a proxy server like NGINX, use the proxy to front the interface endpoint. The interface endpoint uses an Elastic Network Interface (ENI) and therefor has a Security Group, and you can restrict traffic to originate from the proxy using the Security Group. In this case the certificate will reside on the proxy, and TLS will terminate on the proxy server. The proxy server will then access the REST API over a new connection.
One option of using custom domain for private endpoint is to put an (internal facing) application load balancer in front of the API gateway.
When you add a listener to your ALB, you have the option to specify a certificate. Then you point to your ALB with your domain as an alias in Route53.
To summarise:
Create target group that points to the ENI IP addresses of
com.amazonaws.eu-west-1.execute-api
Create internal facing Application Load Balancer
Add the target group as a listener, specify Default SSL/TLS cert
with your domain.
Point your domain to the ALB alias in Route53
Optionally, you could put a Network Load Balancer in front of your
ALB if you need to give the ALB some on-prem address. In that case,
you point your domain to the on-prem (private) address instead of
the ALB alias. Create a new target group that points to your ALB and add it as a listener in NLB.
I have situation where i need my lambda in AWS to run on custom internal domain? I really don't know where to start. I have A virtual private cloud (VPC) setup and my lambda runs inside, also i have internal URL setup in Route53, but I don't know how to glue the two together. I want to invoke my lambda when someone call this internal URL. any suggestions on what i should do.
In order to create an internal API, You can deploy the API in the aws API Gateway. you will also need to explicitly set the endpointType to private.
Steps:
Deploy your api (as private)
by default all the api gateway apis are public. you should explicitly deploy your api as private by setting the endpointType attribute to private.
you will also need to create a resource policy for the API to create a private api.
Create private VPC Endpoint for API gateway
You need to create a private VPC endpoint because you can only access the private API through the private vpc endpoint.
remember: if you do this step, all of your other public APIs accessible only though their custom domains.
attach the VPC endpoint to your private API
you need to attach the vpc endpoint to your api
Accessing the private api
you can only access through the private api through the private vpc endpoint.
curl https://vpce-07f635e4b63555555-abcwdo3f.execute-api.ap-southeast-2.vpce.amazonaws.com/development/hello -H 'x-apigw-api-id: abcdefg2k8'
#VPC Endpoint DNS URL: https://vpce-07f635e4b63555555-abcwdo3f.execute-api.ap-southeast-2.vpce.amazonaws.com
#API Stage: /development
#Endpoint path: /hello
# Your rest api Identifier: abcdefg2k8
Reference: https://aws.amazon.com/blogs/compute/introducing-amazon-api-gateway-private-endpoints/
Custom dns name for private vpc endpoint
you can create a custom domain name from Route53 to point to the private vpc endpoint url by creating an Alias record.
Reference: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-to-vpc-interface-endpoint.html