Description

This is a very easy way to get cheap access to all resources in your VPC.

The exact costs depend on if you use Fargate Spot (default option) and the number of instances (and their size).

• For 1 spot instance of the smallest type: 2.66 USD per month
• For 3 spot instances of the smallest type: 8.00 USD per month

You can use spot instances just fine if the desired_count > 1.

The steps you need to take:

1. Create a Cloudflare account (a free account will do)
2. Setup a cloudflare domain and connect the nameservers and wait until it is verified. After deploying you can click on the domain and find the Account ID.
3. Create a Zero Trust team account (the free account will do)
4. Create a custom API token, with these permissions:
   • Account/Cloudflare Tunnel/Edit
   • Account/Zero Trust/Edit
   • Zone/Zone/Read
5. Deploy this module

These are one time steps and only need to be executed one time in a Zero Trust account:

6. Go to Zero Trust settings > WARP client > Device enrollment permissions and add a rule, for instance you can auth to Warp if your email ends at elasticscale.com
7. Go to Zero Trust settings > WARP Client > Edit the default profile, go the Split Tunnels section and click Manage, remove the CIDR block 10.0.0.0/8 (or if your VPC has another CIDR block that overlaps with one here, remove that one)
8. Install the WARP client, then go to preferences, Account and click Login to Cloudflare Zero trust

After you connect to the WARP agent and whitelist the security group of this module to the instances you want to connect to, you should be able to connect to the instances via their private IPs.

You can also use this module to give Zero Trust access to internal load balancers or other services. You need to then set the ingress rules and add a CNAME to the Cloudflare domain.

For more debugging steps check out the elasticscale blog.

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Requirements

Name	Version
aws	>=5.0.0
cloudflare	>=4.0.0

Providers

Name	Version
aws	>=5.0.0
cloudflare	>=4.0.0
random	n/a

Modules

No modules.

Resources

Name	Type
aws_cloudwatch_log_group.logs	resource
aws_ecs_cluster.main	resource
aws_ecs_cluster_capacity_providers.main	resource
aws_ecs_service.main	resource
aws_ecs_task_definition.main	resource
aws_iam_role.executionrole	resource
aws_iam_role_policy_attachment.ecs_task_execution_role	resource
aws_security_group.tunnel	resource
aws_ssm_parameter.tunneltoken	resource
cloudflare_tunnel.tunnel	resource
cloudflare_tunnel_config.config	resource
cloudflare_tunnel_route.route	resource
random_password.tunnel_secret	resource
random_string.suffix	resource
aws_caller_identity.current	data source
aws_region.current	data source
aws_vpc.vpc	data source
cloudflare_zone.zone	data source

Inputs

Name	Description	Type	Default	Required
cloudflare_account_id	Cloudflare account ID	string	n/a	yes
cloudflare_version	Cloudflare version to use, defaults to latest but best to pick a docker tag version to prevent issues	string	"latest"	no
cloudflare_zone	Domain name (NS must be connected and verified in Cloudflare)	string	n/a	yes
cpu	CPU units to allocate to each instance, defaults to 256, needs to be within Fargate configuration limits	number	256	no
desired_count	Number of instances to run initially, choose 3 or more for high availability across AZs	number	3	no
fargate_type	Use spot instances or regular instances (FARGATE_SPOT or FARGATE), SPOT is much cheaper and does not really affect availability in this case	string	"FARGATE_SPOT"	no
ingress_rules	List of ingress rules to allow traffic to (see cloudflare_tunnel_config docs, access_block not supported right now)	list(object({ hostname = optional(string) path = optional(string) service = string }))	[ { "service": "http_status:404" } ]	no
memory	Memory units to allocate to each instance, defaults to 512, needs to be within Fargate configuration limits	number	512	no
prefix	Prefix to add to all resources	string	"cf-tunnel"	no
private_subnets	List of private subnets to launch the Cloudflare instances in (must be same VPC under VPC ID)	list(string)	n/a	yes
vpc_id	VPC ID	string	n/a	yes

Outputs

Name	Description
security_group_id	The ID of the security group
tunnel_cname	The CNAME of the Cloudflare Tunnel (you can add this as a CNAME in the DNS settings to route traffic to the tunnel, which will be processed by the rules)
tunnel_id	The ID of the Cloudflare Tunnel