Terraform module to define a generic Bastion host with parameterized user_data and support for AWS SSM Session Manager for remote access with IAM authentication.

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Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name	Version
terraform	>= 0.13.0
aws	>= 2.55

Providers

Name	Version
aws	>= 2.55

Modules

Name	Source	Version
dns	cloudposse/route53-cluster-hostname/aws	0.12.2
security_group	cloudposse/security-group/aws	0.3.3
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_eip.default	resource
aws_iam_instance_profile.default	resource
aws_iam_role.default	resource
aws_iam_role_policy.main	resource
aws_instance.default	resource
aws_ami.default	data source
aws_iam_policy_document.default	data source
aws_iam_policy_document.main	data source
aws_region.default	data source
aws_route53_zone.domain	data source

Inputs

Name	Description	Type	Default	Required
additional_tag_map	Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	`map(string)`	`{}`	no
ami	AMI to use for the instance. Setting this will ignore `ami_filter` and `ami_owners`.	`string`	`null`	no
ami_filter	List of maps used to create the AMI filter for the action runner AMI.	`map(list(string))`	{ "name": [ "amzn2-ami-hvm-2.*-x86_64-ebs" ] }	no
ami_owners	The list of owners used to select the AMI of action runner instances.	`list(string)`	[ "amazon" ]	no
assign_eip_address	Assign an Elastic IP address to the instance	`bool`	`true`	no
associate_public_ip_address	Whether to associate a public IP to the instance.	`bool`	`false`	no
attributes	ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the `delimiter` and treated as a single ID element.	`list(string)`	`[]`	no
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as `null` to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	`any`	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
delimiter	Delimiter to be used between ID elements. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
descriptor_formats	Describe additional descriptors to be output in the `descriptors` output map. Map of maps. Keys are names of descriptors. Values are maps of the form `{<br/> format = string<br/> labels = list(string)<br/>}` (Type is `any` so the map values can later be enhanced to provide additional options.) `format` is a Terraform format string to be passed to the `format()` function. `labels` is a list of labels, in order, to pass to `format()` function. Label values will be normalized before being passed to `format()` so they will be identical to how they appear in `id`. Default is `{}` (`descriptors` output will be empty).	`any`	`{}`	no
disable_api_termination	Enable EC2 Instance Termination Protection	`bool`	`false`	no
ebs_block_device_encrypted	Whether to encrypt the EBS block device	`bool`	`true`	no
ebs_block_device_volume_size	The volume size (in GiB) to provision for the EBS block device. Creation skipped if size is 0	`number`	`0`	no
ebs_delete_on_termination	Whether the EBS volume should be destroyed on instance termination	`bool`	`true`	no
ebs_device_name	The name of the EBS block device to mount on the instance	`string`	`"/dev/sdh"`	no
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
host_name	The Bastion hostname created in Route53	`string`	`"bastion"`	no
id_length_limit	Limit `id` to this many characters (minimum 6). Set to `0` for unlimited length. Set to `null` for keep the existing setting, which defaults to `0`. Does not affect `id_full`.	`number`	`null`	no
instance_profile	A pre-defined profile to attach to the instance (default is to build our own)	`string`	`""`	no
instance_type	Bastion instance type	`string`	`"t2.micro"`	no
key_name	Key name	`string`	`""`	no
label_key_case	Controls the letter case of the `tags` keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper`. Default value: `title`.	`string`	`null`	no
label_order	The order in which the labels (ID elements) appear in the `id`. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	`list(string)`	`null`	no
label_value_case	Controls the letter case of ID elements (labels) as included in `id`, set as tag values, and output by this module individually. Does not affect values of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper` and `none` (no transformation). Set this to `title` and set `delimiter` to `""` to yield Pascal Case IDs. Default value: `lower`.	`string`	`null`	no
labels_as_tags	Set of labels (ID elements) to include as tags in the `tags` output. Default is to include all labels. Tags with empty values will not be included in the `tags` output. Set to `[]` to suppress all generated tags. Notes: The value of the `name` tag, if included, will be the `id`, not the `name`. Unlike other `null-label` inputs, the initial setting of `labels_as_tags` cannot be changed in later chained modules. Attempts to change it will be silently ignored.	`set(string)`	[ "default" ]	no
metadata_http_endpoint_enabled	Whether the metadata service is available	`bool`	`true`	no
metadata_http_put_response_hop_limit	The desired HTTP PUT response hop limit (between 1 and 64) for instance metadata requests.	`number`	`1`	no
metadata_http_tokens_required	Whether or not the metadata service requires session tokens, also referred to as Instance Metadata Service Version 2.	`bool`	`true`	no
monitoring	Launched EC2 instance will have detailed monitoring enabled	`bool`	`true`	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a `tag`. The "name" tag is set to the full `id` string. There is no tag with the value of the `name` input.	`string`	`null`	no
namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	`string`	`null`	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits.	`string`	`null`	no
root_block_device_encrypted	Whether to encrypt the root block device	`bool`	`true`	no
root_block_device_volume_size	The volume size (in GiB) to provision for the root block device. It cannot be smaller than the AMI it refers to.	`number`	`8`	no
security_group_description	The Security Group description.	`string`	`"Bastion host security group"`	no
security_group_enabled	Whether to create default Security Group for bastion host.	`bool`	`true`	no
security_group_rules	A list of maps of Security Group rules. The values of map is fully complated with `aws_security_group_rule` resource. To get more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule .	`list(any)`	[ { "cidr_blocks": [ "0.0.0.0/0" ], "description": "Allow all outbound traffic", "from_port": 0, "protocol": -1, "to_port": 0, "type": "egress" }, { "cidr_blocks": [ "0.0.0.0/0" ], "description": "Allow all inbound to SSH", "from_port": 22, "protocol": "tcp", "to_port": 22, "type": "ingress" } ]	no
security_group_use_name_prefix	Whether to create a default Security Group with unique name beginning with the normalized prefix.	`bool`	`false`	no
security_groups	A list of Security Group IDs to associate with bastion host.	`list(string)`	`[]`	no
ssh_user	Default SSH user for this AMI. e.g. `ec2-user` for Amazon Linux and `ubuntu` for Ubuntu systems	`string`	`"ec2-user"`	no
ssm_enabled	Enable SSM Agent on Host.	`bool`	`true`	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
subnets	AWS subnet IDs	`list(string)`	n/a	yes
tags	Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`). Neither the tag keys nor the tag values will be modified by this module.	`map(string)`	`{}`	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	`string`	`null`	no
user_data	User data content. Will be ignored if `user_data_base64` is set	`list(string)`	`[]`	no
user_data_base64	The Base64-encoded user data to provide when launching the instances. If this is set then `user_data` will not be used.	`string`	`""`	no
user_data_template	User Data template to use for provisioning EC2 Bastion Host	`string`	`"user_data/amazon-linux.sh"`	no
vpc_id	VPC ID	`string`	n/a	yes
zone_id	Route53 DNS Zone ID	`string`	`""`	no

Outputs

Name	Description
arn	ARN of the instance
hostname	DNS hostname
id	Disambiguated ID of the instance
instance_id	Instance ID
name	Instance name
private_dns	Private DNS of instance
private_ip	Private IP of the instance
public_dns	Public DNS of instance (or DNS of EIP)
public_ip	Public IP of the instance (or EIP)
role	Name of AWS IAM Role associated with the instance
security_group_arn	Bastion host Security Group ARN
security_group_id	Bastion host Security Group ID
security_group_ids	IDs on the AWS Security Groups associated with the instance
security_group_name	Bastion host Security Group name
ssh_user	SSH user

Related Projects

Check out these related projects.

bastion - 🔒Secure Bastion implemented as Docker Container running Alpine Linux with Google Authenticator & DUO MFA support
terraform-aws-ec2-instance - Terraform module for providing a general EC2 instance provisioned by Ansible
terraform-aws-ec2-ami-backup - Terraform module for automatic & scheduled AMI creation

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License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

Licensed to the Apache Software Foundation (ASF) under one
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README.md

README.md

👽 Use Atmos with Terraform

Makefile Targets

Requirements

Providers

Modules

Resources

Inputs

Outputs

Related Projects

Use Terraform Reference Architectures for AWS

Day-0: Your Foundation for Success

Day-2: Your Operational Mastery

✨ Contributing

🌎 Slack Community

📰 Newsletter

📆 Office Hours

License

Trademarks

Files

README.md

Latest commit

History

README.md

File metadata and controls

👽 Use Atmos with Terraform

Makefile Targets

Requirements

Providers

Modules

Resources

Inputs

Outputs

Related Projects

Use Terraform Reference Architectures for AWS

Day-0: Your Foundation for Success

Day-2: Your Operational Mastery

✨ Contributing

🌎 Slack Community

📰 Newsletter

📆 Office Hours

License

Trademarks