Create a simple ec2 instance in VPC/Subnet of your choice, with SSM enabled so you can get a shell on it without opening SSH. This can be used to test connectivity between AWS locations. It runs a simple user_data.sh script that will install some common tools (docker) and login to the ECR registry of the AWS account.

The only required variables are the vpc_id and subnet_id where you want to creat the instance.

The instance MUST have access to AWS Apis for SSM to work. This can be via a IGW (public IP on instance, or via VPC-Endpoints, see Starting a service in an air gapped private Subnet)

Connecting to a created Server

You can get the instance id from Terraform and pass it straight into AWS CLI. Note the --raw which removes the quotes from the instance_id as AWS CLI fails if they are present.

aws ssm start-session --target $(terraform output --raw instance_id)

Starting a service in an air gapped private Subnet

SSM requires access to AWS APIs in order to work. This requires the server being placed in a Subnet that has outbound internet access. This can be either a public subnet using an Internet Gateway and public IP assigned to the instance, a private subnet with a NAT-Gateway, or in a subnet that has VPC Endpoints configured for ssmmessages, ssm, and ec2messages

Terraform Docs

In order to populate the following Terraform documentation, run the terraform-docs . command. The .terraform-docs.yml file contains the configuration to make sure if gets created in the correct way.

Requirements

Name	Version
aws	>= 4.0

Providers

Name	Version
awS	n/a
aws	>= 4.0
random	n/a
template	n/a

Modules

No modules.

Resources

Name	Type
awS_ec2_instance_state.instance	resource
aws_iam_instance_profile.profile	resource
aws_iam_role.role	resource
aws_instance.instance	resource
aws_security_group.security_group	resource
random_string.module_suffix	resource
aws_ami.this	data source
aws_caller_identity.current	data source
aws_iam_policy_document.assume_policy	data source
aws_region.current	data source
template_file.user_data	data source

Inputs

Name	Description	Type	Default	Required
additional_role_policies	Additional Policies to attach to the instance in additional to SSM	list(string)	[]	no
additional_security_groups	Addition security groups to assign to the instance	list(string)	[]	no
additional_tags	Map of tags to add to all resources	map(string)	{}	no
additional_user_data	Additional code to be added to the user_data.sh script	string	null	no
ami	Specify an AMI to run, if not it will use the latest Amazon Linux, or Windows Server image.	string	""	no
associate_public_ip_address	Assign public IP to the instance.	bool	true	no
comment	Comment tag to add to all resources	string	""	no
instance_name_override	Override the name tag provided to the instance. default: -tmp-instance-	string	null	no
instance_type	AWS instance type to create	string	"t3.nano"	no
key_name	SSH key pair to use	string	""	no
override_name	Override the name of the instance that is created.	string	null	no
state	State of the instance. Valiue values are running, stopped	string	"running"	no
subnet_id	Subnet to create the instance in	string	n/a	yes
volume_size	Root volume size of instance	number	10	no
vpc_id	VPC to create the test instance in	string	n/a	yes
windows	Do you want to run a Windows server?... whyyy?	bool	false	no

Outputs

Name	Description
ami	ID of the AMI that has been selected.
instance	The created instance, allowing use of any of the attributes of the aws_instance resourfce
instance_id	ID of the instance that has been created. Can be used in SSM Start session command with $(terraform output instance_id|jq -r)
instance_role	The IAM role assigned to the instance
security_group	The security group created for instance. Can be used to add additional rules