Automating Provision of NAT Gateways for Increased Bandwidth
Question
Your company currently uses templated NAT instances to route traffic for Instances in private subnets.
They need to convert these to NAT gateways to increase the amount of bandwidth required.
They want to automate the provision.
How can you accomplish this?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.Answer - B.
This example is also given in the AWS Documentation.
Modifying your CloudFormation template to discontinue the use of NAT instances and consume NAT gateways is straightforward.
You would:
Allocate an Elastic IP address.
However, it would not be directly assigned to an instance.
Create a NAT gateway resource.
Create a route to the Internet, but via the NAT gateway instead of going through a NAT instance.
As in the code for NAT instances, this route would then be associated with the route table for the private subnets in the same Availability Zone.
The updated example would look something like this.
{
...
"Resources" : {
...
"NATGateway1EIP" : {
"Type" : "AWS::EC2::EIP",
"Properties" : {
"Domain" : "vpc"
}
},
"NATGateway1" : {
"Type" : "AWS::EC2::NatGateway",
"DependsOn" : "VPCGatewayAttachment",
"Properties" : {
"AllocationId" : {
"Fn::GetAtt" : [
"NATGateway1EIP",
"AllocationId"
]
},
"SubnetId" : {
"Ref" : "PublicSubnetAZ1"
}
}
},
"PrivateRoute1" : {
"Type" : "AWS::EC2::Route",
"Properties" : {
"RouteTableId" : {
"Ref" : "PrivateRouteTable1"
},
"DestinationCidrBlock" : "0.0.0.0/0",
"NatGatewayId" : {
"Ref" : "NATGateway1"
}
}
},
...
}
...
}
Option A is invalid because AWS Config can only check for the configuration of resources.
Option C is invalid because this is used to create stacks of resources.
In this case, it is better to use Cloudformation.
Option D is invalid because AWS Inspector is used to scan for the vulnerability of Instances.
For more information on using Cloudformation templates for NAT gateways, one can visit the below URL.
https://aws.amazon.com/blogs/apn/taking-nat-to-the-next-level-in-aws-cloudformation-templates/The correct answer to this question is B. Use CloudFormation templates to replace the NAT instances with NAT gateways.
Explanation:
AWS provides a fully managed NAT gateway service that allows instances in private subnets to access the internet or other AWS services without exposing their private IP addresses. NAT gateways provide higher bandwidth and availability than traditional NAT instances, making them an ideal choice for environments that require high throughput and high availability.
To automate the provisioning of NAT gateways to replace existing NAT instances, the best approach is to use CloudFormation templates. CloudFormation is a service that provides a way to define infrastructure as code, allowing you to describe and provision all the resources needed for your application or infrastructure in a declarative way.
By using CloudFormation, you can define the resources needed for your NAT gateway infrastructure, including the NAT gateway itself, the route tables that point to the NAT gateway, and any other resources needed to configure your network. Once the CloudFormation template is defined, you can use it to create and manage your NAT gateway infrastructure in an automated way, reducing the time and effort needed to manage the infrastructure manually.
Using AWS Config, Opswork, or AWS Inspector would not be the best approach to automate the provisioning of NAT gateways to replace NAT instances. AWS Config is a service that provides configuration management and compliance checking, but it is not designed to automate the provisioning of infrastructure resources. Opswork is a configuration management service that can be used to manage infrastructure and applications, but it is not designed to automate the creation of infrastructure resources like NAT gateways. AWS Inspector is a security assessment service that helps identify security vulnerabilities, but it is not designed to automate the creation of infrastructure resources like NAT gateways.
