This document applies only to Astro Hybrid. To see whether you're an Astro Hybrid user, click your Workspace name in the upper left corner of the Cloud UI, then click Organization Settings. Your Astro product type is listed under Product Type on the General page.
To create a cluster on Astro Hosted, see Create a dedicated cluster.
Unless otherwise specified, new clusters on Astro are created with a set of default Azure resources that should be suitable for most use cases.
Read the following document for a reference of our default resources as well as supported cluster configurations.
Default cluster values
|Resource||Description||Quantity/ Default Size||Configurable|
|Azure Kubernetes Service (AKS) Cluster||Runs the Astro Data Plane, which hosts the resources and data required to execute Airflow tasks.||1x||Yes. See Manage clusters.|
|Resource Group||A container for cluster resources.||1x|
|Worker node pool||A node pool that hosts all workers with the ||1x pool of Standard_D4d_v5 nodes||Yes. See Manage worker node pools.|
|Airflow node pool||A node pool that runs all core Airflow components, including the scheduler and webserver, for all Deployments in the cluster. This node pool is fully managed by Astronomer.||1x pool of Standard_D4d_v5 nodes|
|Astro system node pool||A node pool that runs all other system components required in Astro. The availability zone determines how many nodes are created. This node pool is fully managed by Astronomer.||1x pool of Standard_D4d_v5 nodes|
|Azure Database for PostgreSQL Flexible Server||The flexible server is the primary database of the Astro data plane. It hosts a metadata database for each Deployment in the cluster. All flexible server instances on Astro are multi-AZ.||Standard D2ds_v4||Yes. See Configure your relational database.|
|Azure Virtual Network (VNet)||A virtual network that hosts Azure resources.||1x /19|
|Subnets||Created in the VNet and used for the backing database, Pod, node, and private endpoints.|
/28 for database
/21 for pods
/21 for nodes
/22 for private endpoints
|Private DNS Zone for Database||Provides access to the private database instance.||1x|
|Azure Storage Account (Standard)||Stores Azure Blobs.||1x|
|Azure Blob Storage||Stores Airflow task logs.||1x|
|Private Endpoint for Blob Storage||Provides access to Azure Blob storage task logs.||1x|
|Private DNS Zone for Blob Storage||Provides access to Azure Blob storage task logs.||1x|
|Public IP Address||Required for connectivity to the control plane and other services.||1x|
Supported cluster regions
You can host Astro Hybrid clusters in the following Azure regions:
|East US 2|
|South Africa North|
|South Central US|
|South East Asia|
|West US 2|
|West US 3|
Modifying the region of an existing Astro cluster isn't supported. If you're interested in a region that isn't listed, contact Astronomer support.
¹ If you want to host Astro in a dedicated account owned by your Organization in one of these regions, you'll need to contact Microsoft Azure Support to enable the regions. If you require clarification about this requirement, contact Astronomer support.
Supported Azure Database for PostgreSQL instance types
The following Azure Database for PostgreSQL instance types are supported on Astro:
- Standard_D2ds_v4 (2 CPU, 8 GiB MEM)
- Standard_D4ds_v4 (4 CPU, 16 GiB MEM)
- Standard_E2ds_v4 (2 CPU, 16 GiB MEM)
- Standard_E4ds_v4 (4 CPU, 32 GiB MEM)
For detailed information about each instance type, see the Azure Database for PostgreSQL documentation. If you're interested in an Azure Database for PostgreSQL instance type that is not on this list, contact Astronomer support.
Supported worker node pool instance types
Each worker node in a pool runs a single worker Pod. A worker Pod's actual available size is equivalent to the total capacity of the instance type minus Astro’s system overhead.
The following table lists all available instance types for worker node pools, as well as the Pod size that is supported for each instance type. As the system requirements of Astro change, these values can increase or decrease.
|Node Instance Type||CPU||Memory|
|Standard_D4_v5||2 CPUs||14.5 GiB MEM|
|Standard_D8_v5||6 CPUs||30.5 GiB MEM|
|Standard_D4d_v5||2 CPUs||14.5 GiB MEM|
|Standard_D8d_v5||6 CPUs||30.5 GiB MEM|
|Standard_B4ms||2 CPUs||14.5 GiB MEM|
|Standard_B8ms||6 CPUs||30.5 GiB MEM|