# ec2_vpc_dhcp_option – Manages DHCP Options, and can ensure the DHCP options for the given VPC match what’s requested

- Synopsis
- Requirements
- Parameters
- Notes
- Examples
- Return Values
- Status

## Synopsis

- This module removes, or creates DHCP option sets, and can associate them to a VPC. Optionally, a new DHCP Options set can be created that converges a VPC’s existing DHCP option set with values provided. When dhcp_options_id is provided, the module will 1. remove (with state=’absent’) 2. ensure tags are applied (if state=’present’ and tags are provided 3. attach it to a VPC (if state=’present’ and a vpc_id is provided. If any of the optional values are missing, they will either be treated as a no-op (i.e., inherit what already exists for the VPC) To remove existing options while inheriting, supply an empty value (e.g. set ntp_servers to [] if you want to remove them from the VPC’s options) Most of the options should be self-explanatory.

## Requirements

The below requirements are needed on the host that executes this module.

- boto
- python >= 2.6

## Parameters

Parameter | Choices/Defaults | Comments
--- | --- | ---
aws_access_key string |  | AWS access key. If not set then the value of the AWS_ACCESS_KEY_ID, AWS_ACCESS_KEY or EC2_ACCESS_KEY environment variable is used. aliases: ec2_access_key, access_key
aws_secret_key string |  | AWS secret key. If not set then the value of the AWS_SECRET_ACCESS_KEY, AWS_SECRET_KEY, or EC2_SECRET_KEY environment variable is used. aliases: ec2_secret_key, secret_key

debug_botocore_endpoint_logs
boolean
added in 2.8

Choices:
- no ←
- yes

Use a botocore.endpoint logger to parse the unique (rather than total) "resource:action" API calls made during a task, outputing the set to the resource_actions key in the task results. Use the aws_resource_action callback to output to total list made during a playbook. The ANSIBLE_DEBUG_BOTOCORE_LOGS environment variable may also be used.

delete_old
boolean

Choices:
- no
- yes ←

Whether to delete the old VPC DHCP option set when associating a new one. This is primarily useful for debugging/development purposes when you want to quickly roll back to the old option set. Note that this setting will be ignored, and the old DHCP option set will be preserved, if it is in use by any other VPC. (Otherwise, AWS will return an error.)

dhcp_options_id - |  | The resource_id of an existing DHCP options set. If this is specified, then it will override other settings, except tags (which will be updated to match)
dns_servers - |  | A list of hosts to set the DNS servers for the VPC to. (Should be a list of IP addresses rather than host names.)
domain_name - |  | The domain name to set in the DHCP option sets
ec2_url string |  | Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints). Ignored for modules where region is required. Must be specified for all other modules if region is not used. If not set then the value of the EC2_URL environment variable, if any, is used.

inherit_existing
boolean

Choices:
- no ←
- yes

For any DHCP options not specified in these parameters, whether to inherit them from the options set already applied to vpc_id, or to reset them to be empty.

netbios_name_servers - |  | List of hosts to advertise as NetBIOS servers.
netbios_node_type - |  | NetBIOS node type to advertise in the DHCP options. The AWS recommendation is to use 2 (when using netbios name services) https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_DHCP_Options.html
ntp_servers - |  | List of hosts to advertise as NTP servers for the VPC.
profile string |  | Uses a boto profile. Only works with boto >= 2.24.0.
region string |  | The AWS region to use. If not specified then the value of the AWS_REGION or EC2_REGION environment variable, if any, is used. See http://docs.aws.amazon.com/general/latest/gr/rande.html#ec2_region aliases: aws_region, ec2_region
security_token string |  | AWS STS security token. If not set then the value of the AWS_SECURITY_TOKEN or EC2_SECURITY_TOKEN environment variable is used. aliases: access_token

state
-

Choices:
- absent
- present ←

create/assign or remove the DHCP options. If state is set to absent, then a DHCP options set matched either by id, or tags and options will be removed if possible.

tags - |  | Tags to be applied to a VPC options set if a new one is created, or if the resource_id is provided. (options must match) aliases: resource_tags

validate_certs
boolean

Choices:
- no
- yes ←

When set to "no", SSL certificates will not be validated for boto versions >= 2.6.0.

vpc_id - |  | VPC ID to associate with the requested DHCP option set. If no vpc id is provided, and no matching option set is found then a new DHCP option set is created.

## Notes

Note

- If parameters are not set within the module, the following environment variables can be used in decreasing order of precedence `AWS_URL` or `EC2_URL`, `AWS_ACCESS_KEY_ID` or `AWS_ACCESS_KEY` or `EC2_ACCESS_KEY`, `AWS_SECRET_ACCESS_KEY` or `AWS_SECRET_KEY` or `EC2_SECRET_KEY`, `AWS_SECURITY_TOKEN` or `EC2_SECURITY_TOKEN`, `AWS_REGION` or `EC2_REGION`
- Ansible uses the boto configuration file (typically ~/.boto) if no credentials are provided. See https://boto.readthedocs.io/en/latest/boto_config_tut.html
- `AWS_REGION` or `EC2_REGION` can be typically be used to specify the AWS region, when required, but this can also be configured in the boto config file

## Examples

    # Completely overrides the VPC DHCP options associated with VPC vpc-123456 and deletes any existing
    # DHCP option set that may have been attached to that VPC.
    - ec2_vpc_dhcp_option:
        domain_name: "foo.example.com"
        region: us-east-1
        dns_servers:
            - 10.0.0.1
            - 10.0.1.1
        ntp_servers:
            - 10.0.0.2
            - 10.0.1.2
        netbios_name_servers:
            - 10.0.0.1
            - 10.0.1.1
        netbios_node_type: 2
        vpc_id: vpc-123456
        delete_old: True
        inherit_existing: False

    # Ensure the DHCP option set for the VPC has 10.0.0.4 and 10.0.1.4 as the specified DNS servers, but
    # keep any other existing settings. Also, keep the old DHCP option set around.
    - ec2_vpc_dhcp_option:
        region: us-east-1
        dns_servers:
          - "{{groups['dns-primary']}}"
          - "{{groups['dns-secondary']}}"
        vpc_id: vpc-123456
        inherit_existing: True
        delete_old: False

    ## Create a DHCP option set with 4.4.4.4 and 8.8.8.8 as the specified DNS servers, with tags
    ## but do not assign to a VPC
    - ec2_vpc_dhcp_option:
        region: us-east-1
        dns_servers:
          - 4.4.4.4
          - 8.8.8.8
        tags:
          Name: google servers
          Environment: Test

    ## Delete a DHCP options set that matches the tags and options specified
    - ec2_vpc_dhcp_option:
        region: us-east-1
        dns_servers:
          - 4.4.4.4
          - 8.8.8.8
        tags:
          Name: google servers
          Environment: Test
      state: absent

    ## Associate a DHCP options set with a VPC by ID
    - ec2_vpc_dhcp_option:
        region: us-east-1
        dhcp_options_id: dopt-12345678
        vpc_id: vpc-123456

## Return Values

Common return values are documented here, the following are the fields unique to this module:

Key | Returned | Description
--- | --- | ---
changed boolean | always | Whether the dhcp options were changed
dhcp_options_id string | when available | The aws resource id of the primary DCHP options set created, found or removed
new_options dictionary | when appropriate | The DHCP options created, associated or found Sample: {'domain-name-servers': ['10.0.0.1', '10.0.1.1'], 'netbois-name-servers': ['10.0.0.1', '10.0.1.1'], 'netbios-node-type': 2, 'domain-name': 'my.example.com'}

## Status

- This module is guaranteed to have backward compatible interface changes going forward. [stableinterface]
- This module is maintained by the Ansible Community. [community]

### Authors

- Joel Thompson (@joelthompson)

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