AWS Amazon EC2 DHCP Options

This page shows how to write Terraform and CloudFormation for Amazon EC2 DHCP Options and write them securely.

aws_vpc_dhcp_options (Terraform)

The DHCP Options in Amazon EC2 can be configured in Terraform with the resource name aws_vpc_dhcp_options. The following sections describe 3 examples of how to use the resource and its parameters.

Example Usage from GitHub

main.tf#L9
resource "aws_vpc_dhcp_options" "principal" {
  domain_name_servers = ["AmazonProvidedDNS"]
}

resource "aws_vpc_dhcp_options_association" "principal" {
  vpc_id          = var.vpc_id
main.tf#L9
resource "aws_vpc_dhcp_options" "principal" {
  domain_name_servers = ["AmazonProvidedDNS"]
}

resource "aws_vpc_dhcp_options_association" "principal" {
  vpc_id          = var.vpc_id
dhcp.tf#L1
resource "aws_vpc_dhcp_options" "dhcp-lamda" {
  domain_name         = "adi123.com.domain_name"
  domain_name_servers = ["AmazonProvidedDNS"]

  tags {
    Name = "dhcp-aditya"

Review your Terraform file for AWS best practices

Shisho Cloud, our free checker to make sure your Terraform configuration follows best practices, is available (beta).

Parameters

Explanation in Terraform Registry

Provides a VPC DHCP Options resource.

Tips: Best Practices for The Other AWS Amazon EC2 Resources

In addition to the aws_default_vpc, AWS Amazon EC2 has the other resources that should be configured for security reasons. Please check some examples of those resources and precautions.

risk-label

aws_default_vpc

Ensure to avoid using default VPC

It is better to define the own VPC and use it.

risk-label

aws_network_acl_rule

Ensure your network ACL rule blocks unwanted inbound traffic

It is better to block unwanted inbound traffic.

risk-label

aws_ebs_volume

Ensure to use a customer-managed key for EBS volume encryption

It is better to use a customer-managed key for EBS volume encryption. It can be gain more control over the encryption by using customer-managed keys (CMK).

risk-label

aws_instance

Ensure to avoid storing AWS access keys in user data

It is better to avoid storing AWS access keys in user data. `aws_iam_instance_profile` could be used instead.

risk-label

aws_security_group

Ensure your security group blocks unwanted inbound traffic

It is better to block unwanted inbound traffic.

Review your AWS Amazon EC2 settings

In addition to the above, there are other security points you should be aware of making sure that your .tf files are protected in Shisho Cloud.

AWS::EC2::DHCPOptions (CloudFormation)

The DHCPOptions in EC2 can be configured in CloudFormation with the resource name AWS::EC2::DHCPOptions. The following sections describe 10 examples of how to use the resource and its parameters.

Example Usage from GitHub

dhcp_option_set.yml#L4
    Type: 'AWS::EC2::DHCPOptions'
    Properties:
      Tags:
        - Key: Name
          Value: test.local
      DomainName: test.local
01-create-vpc-template-cfn.yml#L25
    Type: 'AWS::EC2::DHCPOptions'
    Properties:
      Tags:
        - Key: Name
          Value: ds-common-dopt
      DomainName: ap-northeast-1.compute.internal
sample-cfn.yml#L25
    Type: 'AWS::EC2::DHCPOptions'
    Properties:
      Tags:
        - Key: Name
          Value: sample-cfn-dopt
      DomainName: ap-northeast-1.compute.internal
vpc.yml#L19
    Type: AWS::EC2::DHCPOptions
    Properties:
      DomainName: !Sub "${AWS::Region}.compute.internal"
      DomainNameServers:
        - AmazonProvidedDNS

vpc.yml#L19
    Type: AWS::EC2::DHCPOptions
    Properties:
      DomainName: !Sub "${AWS::Region}.compute.internal"
      DomainNameServers:
        - AmazonProvidedDNS

dhcp.json#L8
      "Type": "AWS::EC2::DHCPOptions",
      "Properties": {
        "DomainName": "us-west-2.compute.internal",
        "DomainNameServers": [
          "AmazonProvidedDNS"
        ]
cfn-vpc-dhcp-options-asssociation-initial-stack.json#L6
            "Type" : "AWS::EC2::DHCPOptions",
            "Properties" : {
                "DomainName" : "example.com",
                "DomainNameServers" : [ "AmazonProvidedDNS" ],
                "NtpServers" : [ "10.2.5.1" ],
                "NetbiosNameServers" : [ "10.2.5.1" ],
cfn-vpc-dhcp-options-asssociation-update-stack.json#L6
            "Type" : "AWS::EC2::DHCPOptions",
            "Properties" : {
                "DomainName" : "example.com",
                "DomainNameServers" : [ "AmazonProvidedDNS" ],
                "NtpServers" : [ "10.2.5.1" ],
                "NetbiosNameServers" : [ "10.2.5.1" ],
DHCP_OPTION_SET.json#L5
      "Type": "AWS::EC2::DHCPOptions",
      "Properties": {
        "Tags": [
          {
            "Key": "Name",
            "Value": "test.local"
just_dhcp_options.json#L4
      "Type" : "AWS::EC2::DHCPOptions",
      "Properties": {
        "DomainNameServers" : [ "10.0.0.1", "10.0.0.2" ]
      }
    }
  }

Parameters

Explanation in CloudFormation Registry

Specifies a set of DHCP options for your VPC.

You must specify at least one of the following properties: DomainNameServers, NetbiosNameServers, NtpServers. If you specify NetbiosNameServers, you must specify NetbiosNodeType.

Frequently asked questions

What is AWS Amazon EC2 DHCP Options?

AWS Amazon EC2 DHCP Options is a resource for Amazon EC2 of Amazon Web Service. Settings can be wrote in Terraform and CloudFormation.

Where can I find the example code for the AWS Amazon EC2 DHCP Options?

For Terraform, the andremulin/aws_route53_strategies_article, andremulin/aws_route53_strategies_article and adilogishetty/AWS-DevOps-Sample-TEK source code examples are useful. See the Terraform Example section for further details.

For CloudFormation, the gabe1314/Cloudformation-templates, d-shimizu/aws-cloudformation-sample-cross-stack and d-shimizu/aws-cloudformation-sample-single-stack source code examples are useful. See the CloudFormation Example section for further details.