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Create a network connection between Astro and AWS

Use this document to learn how you can grant Astro cluster and its Deployments access to your external AWS resources.

Publicly accessible endpoints allow you to quickly connect your Astro clusters or Deployments to AWS through an Airflow connection. If your cloud restricts IP addresses, you can add the external IPs of your Deployment or cluster to an AWS resource's allowlist.

If you have stricter security requirements, you can create a private connection to AWS in a few different ways.

After you create a connection from your cluster to AWS, you might also need to individually authorize Deployments to access specific resources. See Authorize your Deployment using workload identity.

Standard and dedicated cluster support for AWS networking

Standard clusters have different connection options than dedicated clusters.

Standard clusters can connect to AWS in the following ways:

Dedicated clusters can connect to AWS in the same ways as standard clusters. Additionally, they support a number of private connectivity options including:

  • VPC peering
  • Transit Gateways
  • AWS PrivateLink

If you require a private connection between Astro and AWS, Astronomer recommends configuring a dedicated cluster. See Create a dedicated cluster. Transitive connectivity to on-premise networks is also possible through your managed VPCs. However, architectures with a demarcation point between Astro and your on-premise network are not supported.

Access a public AWS endpoint

All Astro clusters include a set of external IP addresses that persist for the lifetime of the cluster. To facilitate communication between an Astro cluster and your cloud, you can allowlist these external IPs in your cloud. If you have no other security restrictions, this means that any cluster with an allowlisted external IP address can access your AWS resources through a valid Airflow connection.

Allowlist external IP addresses for a cluster

  1. In the Cloud UI, click your Workspace name in the upper left corner, then click Organization Settings.
  2. Click Clusters, then select a cluster.
  3. In the Details page, copy the IP addresses listed under External IPs.
  4. Add the IP addresses to the allowlist of any external services that you want your cluster to access. You can also access these IP addresses from the Details page of any Deployment in the cluster.

After you allowlist a cluster's IP addresses, all Deployments in that cluster have network connectivity to AWS. When you use publicly accessible endpoints to connect to AWS, traffic moves directly between your Astro cluster and the AWS API endpoint. Data in this traffic never reaches the Astronomer managed control plane. Note that you still might also need to authorize your Deployment to some resources before it can access them.

Create a private connection between Astro and AWS

Choose one of the following setups based on the security requirements of your company and your existing infrastructure.

info

This connection option is only available for dedicated Astro Hosted clusters and Astro Hybrid.

warning

Self-service VPC configuration on Astro Hosted is in Public Preview.

Prerequisites

  • An external VPC on AWS
  • A CIDR block for your external VPC in the RFC 1918 range
  • Organization Owner permissions

Setup

To set up a private connection between an Astro VPC and an AWS VPC, you can create a VPC peering connection. VPC peering ensures private and secure connectivity, reduces network transit costs, and simplifies network layouts.

  1. Open the AWS console of the AWS account with the external VPC and copy the following:

    • AWS account ID
    • AWS region
    • VPC ID of the external VPC
    • CIDR block of the external VPC
  2. In the Cloud UI, click your Workspace name in the upper left corner, then click Organization Settings.

  3. Click Clusters, select your cluster, click VPC Peering Connections, then click + VPC Peering Connection.

  4. Configure the following values for your VPC peering connection using the information you copied in Step 1:

    • Peering Name: Provide a name for the VPC peering connection.
    • AWS account ID: Enter the account ID of the external VPC.
    • Destination VPC ID: Enter the VPC ID.
    • Destination VPC region: Enter the region of the external VPC.
    • Destination VPC CIDR block: Enter the CIDR block of the external VPC.
  5. Click Create Connection. The connection appears as Pending.

  6. Wait a few minutes for the Complete Activation button to appear, then click Complete Activation link.

  7. In the modal that appears, follow the instructions to accept the connection from your external VPC and create routes from the external VPC to Astro.

A few minutes after you complete the instructions in the modal, the connection status changes from Pending to Active. A new default route appears in Routes with your configured CIDR block.

Troubleshooting VPC connection statuses

Astro might show additional information in your connection status if it has an issue when it creates the connection. The following are all possible connection statuses.

  • Pending (Without Complete Activation): Astro is sending the peering request to the external VPC. Wait 1-2 minutes for request to be created and sent.
  • Pending (With Complete Activation): The peering connection request has been created and sent. Click Complete Activation to finish the setup.
  • Active: The peering connection was successfully created and accepted.
  • Failed: The peering connection request was rejected. Delete the failed connection and retry using a new connection configuration. If you don't delete the failed connection, Astro will retry creating the peering request whenever you create a new VPC connection.
  • Not Found: Astro failed to create the peering request. Wait 5 minutes for Astro to retry. If the status hasn't changed after 5 minutes, delete the connection and retry using a new connection configuration.

Note that a VPC connection can be listed as Active even when it has an incorrectly configured CIDR block. To reconfigure your CIDR block without deleting your connection, delete the route that was generated when you configured the connection and create a new route with the correct CIDR block.

Alternative Astro Hybrid setup

To set up a private connection between an Astro VPC and an AWS VPC, you can create a VPC peering connection. VPC peering ensures private and secure connectivity, reduces network transit costs, and simplifies network layouts.

To create a VPC peering connection between an Astro VPC and an AWS VPC, you must create a temporary assumable role. The Astro AWS account will assume this role to initiate a VPC peering connection.

  1. Open the AWS console of the AWS account with the external VPC and copy the following:

    • AWS account ID
    • AWS region
    • VPC ID of the external VPC
    • CIDR block of the external VPC
  2. Create a temporary role using the role creation stack template. In the Quick create stack template that opens, complete the following fields:

    • Stack name: Enter a meaningful name for your stack.
    • Peer Owner IDs: Enter your cluster's AWS account ID. To retrieve your cluster's AWS account ID on Astro Hosted, contact Astronomer support. To retrieve your cluster's AWS account ID on Astro Hybrid, click the name of your Workspace in the upper left corner of the Cloud UI, click Organization Settings, then click Clusters. Open your cluster and copy its Account ID.
  3. After the stack is created, go to the Outputs tab and copy the value from the PeerRole ARN field.

  4. In the Cloud UI, click your Workspace name in the upper left corner, then click Organization Settings. Click Clusters, select your cluster, and copy the ID of the cluster.

  5. Contact Astronomer support and provide the following details:

    • AWS region of the external VPC from Step 1
    • VPC ID of the external VPC from Step 1
    • AWS account ID of the external VPC from Step 1
    • CIDR block of the external VPC from Step 1
    • PeerRole ARN from Step 3
    • Astro cluster ID from Step 4

    Astronomer support will initiate a peering request and create the routing table entries in the Astro VPC.

  6. Wait for Astronomer support to send you the Astro VPC CIDR and VPC peering ID. Then, the owner of the external VPC needs to add a route in the external VPC, using the Astro VPC CIDR as the Destination and the VPC peering ID as the Target.

  7. (Optional) Delete the stack that you created. This will delete the temporary assumable role.

Configure additional routes for a VPC connection

Your initial VPC connection connects Astro to your external VPC through a primary CIDR block. To connect Astro to other data services or systems within the external VPC, you can create additional routes to secondary CIDR blocks or subnets within the primary CIDR block. You can also complete this setup if you recently configured a new service in your external VPC and want to connect it with Astro without updating your base VPC connection.

  1. Open the Routes tab, then click + Route.

  2. Configure the following details for your route:

    • Route ID: Provide a name for the route.
    • Destination: Enter the subnet of the service in the external VPC.
    • Target: Select the VPC peering connection you configured.
  3. Click Create Route, then wait a few minutes for the route to be created.

DNS considerations for VPC peering

If your external VPC resolves DNS hostnames using DNS Hostnames and DNS Resolution, you must also enable the Accepter DNS Resolution setting on AWS. This allows Astro clusters and Deployments to resolve the public DNS hostnames of the external VPC to its private IP addresses. To configure this option, see AWS Documentation.

If your external VPC resolves DNS hostnames using private hosted zones, then you must associate your Route53 private hosted zone with the Astro VPC using instructions provided in AWS Documentation.

To retrieve the ID of any Astro VPC, contact Astronomer support. If you have more than one Astro cluster, request the VPC ID of each cluster.

Hostname resolution options

Securely connect Astro to resources running in other VPCs or on-premises through a resolving service.

Using Route 53 requires sharing a resolver rule with your Astro account. If this is a security concern, Astronomer recommends using Domain Name System (DNS) forwarding.

Use Route 53 Resolver rules to allow Astro to resolve DNS queries for resources running in other VPCs or on-premises.

Prerequisites

  • An Amazon Route 53 Resolver rule. See Managing forwarding rules.
  • Permission to share resources using the AWS Resource Access Manager (RAM)

Share the Amazon Route 53 Resolver rule

To allow Astro to access a private hosted zone, you need to share your Amazon Route 53 Resolver rule with your Astro AWS account.

  1. In the Route 53 Dashboard, click Rules below Resolver in the navigation menu.

  2. Select a Resolver rule and then click Details.

  3. Click Share and enter Astro in the Name field.

  4. In the Resources - optional section, select Resolver Rules in the Select resource type list and then select one or more rules.

  5. On the Associate permissions page, accept the default settings and then click Next.

  6. On the Grant access to principals page, select Allow sharing only within your organization, and then enter your Astro AWS account ID for your organization in the Enter an AWS account ID field.

    To get the Astro AWS account ID, click the name of your Workspace in the upper left corner of the Cloud UI, then click Organization Settings. From the General page, copy the AWS External ID.

  7. Click Create resource share.

Contact Astronomer support for rule verification

To verify that the Amazon Route 53 Resolver rule was shared correctly, submit a request to Astronomer support. With your request, include the Amazon Route 53 Resolver rule ID. To locate the Resolver rule ID, open the Route 53 Dashboard, and in the left menu click Rules below Resolver. Copy the value in the Resolver ID column.

Create a connection to confirm connectivity (optional)

When Astronomer support confirms that the Amazon Route 53 Resolver rule was successfully associated with the Astro VPC, you can create a connection to the resource that is resolved by the shared rule. See Managing Connections.

See Also

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