AWS Amazon EC2 DHCP Options Association
This page shows how to write Terraform and CloudFormation for Amazon EC2 DHCP Options Association and write them securely.
aws_vpc_dhcp_options_association (Terraform)
The DHCP Options Association in Amazon EC2 can be configured in Terraform with the resource name aws_vpc_dhcp_options_association
. The following sections describe 2 examples of how to use the resource and its parameters.
Example Usage from GitHub
resource "aws_vpc_dhcp_options_association" "principal" {
vpc_id = var.vpc_id
dhcp_options_id = aws_vpc_dhcp_options.principal.id
}
resource "aws_vpc_dhcp_options" "secondary" {
resource "aws_vpc_dhcp_options_association" "principal" {
vpc_id = var.vpc_id
dhcp_options_id = aws_vpc_dhcp_options.principal.id
}
resource "aws_vpc_dhcp_options" "secondary" {
Parameters
-
dhcp_options_id
required - string -
id
optional computed - string -
vpc_id
required - string
Explanation in Terraform Registry
Provides a VPC DHCP Options Association 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.
aws_default_vpc
Ensure to avoid using default VPC
It is better to define the own VPC and use it.
aws_network_acl_rule
Ensure your network ACL rule blocks unwanted inbound traffic
It is better to block unwanted inbound traffic.
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).
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.
aws_security_group
Ensure your security group blocks unwanted inbound traffic
It is better to block unwanted inbound traffic.
AWS::EC2::VPCDHCPOptionsAssociation (CloudFormation)
The VPCDHCPOptionsAssociation in EC2 can be configured in CloudFormation with the resource name AWS::EC2::VPCDHCPOptionsAssociation
. The following sections describe 10 examples of how to use the resource and its parameters.
Example Usage from GitHub
Type: AWS::EC2::VPCDHCPOptionsAssociation
Properties:
VpcId:
Ref: VPC
DhcpOptionsId:
Ref: DhcpOptions
Type: 'AWS::EC2::VPCDHCPOptionsAssociation'
Properties:
VpcId: !Ref vpc1
DhcpOptionsId: !Ref dopt1
Outputs:
VpcId:
Type: 'AWS::EC2::VPCDHCPOptionsAssociation'
Properties:
VpcId: !Ref vpc1
DhcpOptionsId: !Ref dopt1
subnet1:
Type: AWS::EC2::VPCDHCPOptionsAssociation
Properties:
DhcpOptionsId: !Ref DhcpOptions
VpcId: !Ref Vpc
#
Type: AWS::EC2::VPCDHCPOptionsAssociation
Properties:
DhcpOptionsId: !Ref DhcpOptions
VpcId: !Ref Vpc
#
"Type": "AWS::EC2::VPCDHCPOptionsAssociation",
"Properties": {
"DhcpOptionsId": {
"Ref": "optionSet"
},
"VpcId": {
"Type" : "AWS::EC2::VPCDHCPOptionsAssociation",
"Properties" : {
"VpcId": { "Ref" : "VPC" },
"DhcpOptionsId": { "Ref" : "DHCPOpts" }
}
}
"Type": "AWS::EC2::VPCDHCPOptionsAssociation"
}
}
"Type": "AWS::EC2::VPCDHCPOptionsAssociation",
"Properties": {
"VpcId": {"Fn::ImportValue": "VPCId"},
"DhcpOptionsId": {
"Ref": "DHCPOpt"
}
"Type": "AWS::EC2::VPCDHCPOptionsAssociation",
"Properties": {
"VpcId": {"Fn::ImportValue": "VPCId"},
"DhcpOptionsId": {
"Ref": "DHCPOpt"
}
Parameters
-
DhcpOptionsId
required - String -
VpcId
required - String
Explanation in CloudFormation Registry
Associates a set of DHCP options with a VPC, or associates no DHCP options with the VPC.
After you associate the options with the VPC, any existing instances and all new instances that you launch in that VPC use the options. You don't need to restart or relaunch the instances. They automatically pick up the changes within a few hours, depending on how frequently the instance renews its DHCP lease. You can explicitly renew the lease using the operating system on the instance.
Frequently asked questions
What is AWS Amazon EC2 DHCP Options Association?
AWS Amazon EC2 DHCP Options Association 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 Association?
For Terraform, the andremulin/aws_route53_strategies_article and andremulin/aws_route53_strategies_article source code examples are useful. See the Terraform Example section for further details.
For CloudFormation, the saineju/ansible-windows-demo, 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.