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Version: 0.26

Install Astronomer Software on GCP GKE

This guide describes the steps to install Astronomer on Google Cloud Platform (GCP), which allows you to deploy and scale any number of Apache Airflow deployments within an GCP Google Kubernetes Engine (GKE) cluster.


To install Astronomer on GCP, you'll need access to the following tools and permissions:

Step 1: Choose a Base Domain

All Astronomer services will be tied to a base domain of your choice, under which you will need the ability to add and edit DNS records.

Once created, your Astronomer base domain will be linked to a variety of sub-services that your users will access via the internet to manage, monitor and run Airflow on the platform.

For the base domain, for example, here are some corresponding URLs that your users would be able to reach:

  • Software UI:
  • Airflow Deployments:
  • Grafana Dashboard:
  • Kibana Dashboard:

For the full list of subdomains, see Step 4.

Step 2: Configure GCP for Astronomer Deployment

Note: You can view Google Cloud Platform's Web Console at

Create a GCP Project

Login to your Google account with the gcloud CLI:

gcloud auth login

Create a project:

gcloud projects create [PROJECT_ID]

Confirm the project was successfully created:

$ gcloud projects list
astronomer-project astronomer-project 364686176109

Configure the gcloud CLI for use with your new project:

gcloud config set project [PROJECT_ID]

Set your preferred compute zone, which will have a compute region tied to it.

You'll need this later on:

gcloud compute zones list
gcloud config set compute/zone [COMPUTE_ZONE]

Create a GKE Cluster

Now that you have a GCP project to work with, the next step is to create a GKE (Google Kubernetes Engine) cluster that the Astronomer platform can be deployed into. Learn more about GKE here.

Note: Astronomer Software does not support GKE Autopilot.

First, enable the Google Kubernetes Engine API.

Then, create a Kubernetes cluster via the gcloud CLI:

gcloud container clusters create [CLUSTER_NAME] --zone [COMPUTE_ZONE] --cluster-version [VERSION] --machine-type n1-standard-8 --enable-autoscaling --max-nodes 10 --min-nodes 3

A few important notes:

  • Each version of Astronomer Software is compatible with only a particular set of Kubernetes versions. For more information, refer to Astronomer's Version Compatibility Reference.
  • We recommend using the n1-standard-8 machine type with a minimum of 3 nodes (24 CPUs) as a starting point.
  • The Astronomer platform and all components within it will consume ~11 CPUs and ~40GB of memory as the default overhead, so we generally recommend using larger vs smaller nodes.
  • For more detailed instructions and a full list of optional flags, refer to GKE's "Creating a Cluster".

If you work with multiple Kubernetes environments, kubectx is an incredibly useful tool for quickly switching between Kubernetes clusters. Learn more here.

Step 3: Configure Helm with Your GKE Cluster

Helm is a package manager for Kubernetes. It allows you to easily deploy complex Kubernetes applications. You'll use helm to install and manage the Astronomer platform. Learn more about helm here.

Create a Kubernetes Namespace

Create a namespace called astronomer to host the core Astronomer platform:

kubectl create namespace astronomer

Once Astronomer is running, each Airflow Deployment that you create will have its own isolated namespace.

Step 4: Configure TLS

We recommend running Astronomer Software on a dedicated domain (BASEDOMAIN) or subdomain (astro.BASEDOMAIN).

In order for users to access the web applications they need to manage Astronomer, you'll need a TLS certificate that covers the following subdomains:


To obtain a TLS certificate, complete one of the following setups:

  • Option 1: Obtain a TLS certificate from Let's Encrypt. We recommend this option for smaller organizations where your DNS administrator and Kubernetes cluster administrator are either the same person or on the same team.
  • Option 2: Request a TLS certificate from your organization's security team. We recommend this option for large organizations with their own protocols for generating TLS certificates.

Option 1: Create TLS certificates using Let's Encrypt

Let's Encrypt is a free and secure certificate authority (CA) service that provides TLS certificates that renew automatically every 90 days. Use this option if you are configuring Astronomer for a smaller organization without a dedicated security team.

To set up TLS certificates this way, follow the guidelines in Automatically Renew TLS Certificates Using Let's Encrypt. Make note of the certificate you create in this setup for Step 5.

Option 2: Request a TLS certificate from your security team

If you're installing Astronomer for a large organization, you'll need to request a TLS certificate and private key from your enterprise security team. This certificate needs to be valid for the BASEDOMAIN your organization uses for Astronomer, as well as the subdomains listed at the beginning of Step 4. You should be given two .pem files:

  • One for your encrypted certificate
  • One for your private key

To confirm that your enterprise security team generated the correct certificate, run the following command using the openssl CLI:

openssl x509 -in  <your-certificate-filepath> -text -noout

This command will generate a report. If the X509v3 Subject Alternative Name section of this report includes either a single *.BASEDOMAIN wildcard domain or the subdomains listed at the beginning of Step 4, then the certificate creation was successful.

Depending on your organization, you may receive either a globally trusted certificate or a certificate from a private CA. The certificate from your private CA may include a domain certificate, a root certificate, and/or intermediate certificates, all of which need to be in proper certificate order. To verify certificate order, follow the guidelines below.

Confirm certificate chain order

If your organization is using a private certificate authority, you'll need to confirm that your certificate chain is ordered correctly. To determine your certificate chain order, run the following command using the openssl CLI:

openssl crl2pkcs7 -nocrl -certfile <your-certificate-filepath> | openssl pkcs7 -print_certs -noout

The command generates a report of all certificates. Verify the order of the certificates is as follows:

  • Domain
  • Intermediate (optional)
  • Root

If the certificate order is correct, proceed to step 5.

Step 5: Create a Kubernetes TLS Secret

If you received a globally trusted certificate, such as one generated by Let's Encrypt, simply run the following command and proceed to Step 6:

kubectl create secret tls astronomer-tls --cert <your-certificate-filepath> --key <your-private-key-filepath>

If you received a certificate from a private CA, follow these steps instead:

  1. Add the root certificate provided by your security team to an Opaque Kubernetes secret in the Astronomer namespace by running the following command:

    kubectl create secret generic private-root-ca --from-file=cert.pem=./<your-certificate-filepath>

    Note: The root certificate which you specify here should be the certificate of the authority that signed the Astronomer certificate, rather than the Astronomer certificate itself. This is the same certificate you need to install with all clients to get them to trust your services.

    Note: The name of the secret file must be cert.pem for your certificate to be trusted properly.

  1. Note the value of private-root-ca for when you configure your Helm chart in Step 8. You'll need to additionally specify the privateCaCerts key-value pair with this value for that step.

Step 6: Retrieve Your SMTP URI

An SMTP service is required so that users can send and accept email invites to and from Astronomer. To integrate your SMTP service with Astronomer, make note of your SMTP service's URI and add it to your Helm chart in Step 8. In general, an SMTP URI will take the following form:


The following table contains examples of what the URI will look like for some of the most popular SMTP services:

ProviderExample SMTP URL
AWS SESsmtp://
Custom SMTP-relaysmtp://

If your SMTP provider is not listed, refer to the provider's documentation for information on creating an SMTP URI.

Note: If there are / or other escape characters in your username or password, you may need to URL encode those characters.

Step 7: Configure the Database

Astronomer by default requires a central Postgres database that will act as the backend for Astronomer's Houston API and will host individual Metadata Databases for all Airflow Deployments spun up on the platform.

While you're free to configure any database, most GCP users on Astronomer run Google Cloud SQL. For production environments, we strongly recommend a managed Postgres solution.

Note: If you're setting up a development environment, this step is optional. Astronomer can be configured to deploy the PostgreSQL helm chart as the backend database with the following set in your config.yaml:

postgresqlEnabled: true

To connect to an external database to your GKE cluster, create a Kubernetes Secret named astronomer-bootstrap that points to your database.

kubectl create secret generic astronomer-bootstrap \
--from-literal connection="postgres://USERNAME:$PASSWORD@host:5432" \
--namespace astronomer

Note: You must URL encode any special characters in your Postgres password.

Step 8: Configure Your Helm Chart

Note: If you want to use a third-party ingress controller for Astronomer, complete the setup steps in Third-Party Ingress Controllers in addition to this configuration.

As a next step, create a file named config.yaml in an empty directory.

For context, this config.yaml file will assume a set of default values for our platform that specify everything from user role definitions to the Airflow images you want to support. As you grow with Astronomer and want to customize the platform to better suit your team and use case, your config.yaml file is the best place to do so.

In the newly created file, copy the example below and replace baseDomain, private-root-ca, /etc/docker/certs.d, ssl.enabled, and smtpUrl with your own values. For more example configuration files, go here.

### Astronomer global configuration
# Base domain for all subdomains exposed through ingress

# Name of secret containing TLS certificate
tlsSecret: astronomer-tls

# Enable privateCaCerts only if your enterprise security team
# generated a certificate from a private certificate authority.
# Create a generic secret for each cert, and add it to the list below.
# Each secret must have a data entry for 'cert.pem'
# Example command: `kubectl create secret generic private-root-ca --from-file=cert.pem=./<your-certificate-filepath>`
- private-root-ca

# Enable privateCaCertsAddToHost only when your nodes do not already
# include the private CA in their docker trust store.
# Most enterprises already have this configured,
# and in that case 'enabled' should be false.
enabled: true
hostDirectory: /etc/docker/certs.d
# For development or proof-of-concept, you can use an in-cluster database
postgresqlEnabled: false

# Enables using SSL connections to
# encrypt client/server communication
# between databases and the Astronomer platform.
# If your database enforces SSL for connections,
# change this value to true
enabled: false
### Nginx configuration
# IP address the nginx ingress should bind to
loadBalancerIP: ~
# Dict of arbitrary annotations to add to the nginx ingress. For full configuration options, see
ingressAnnotations: {}

### SMTP configuration

publicSignups: false # Users need to be invited to have access to Astronomer. Set to true otherwise
emailConfirmation: true # Users get an email verification before accessing Astronomer
manualReleaseNames: true # Allows you to set your release names
serviceAccountAnnotationKey: # Flag to enable using IAM roles (don't enter a specific role)
enabled: true
reply: "" # Emails will be sent from this address
enabled: true # Lets users authenticate with Github
enabled: false # Disables logging in with just a username and password
enabled: true # Lets users authenticate with Google

SMTP is required and will allow users to send and accept email invites to Astronomer. The SMTP URI will take the following form:

smtpUrl: smtps://USERNAME:PW@HOST/?pool=true

These are the minimum values you need to configure for installing Astronomer. For information on additional configuration, read What's Next.

Step 9: Install Astronomer

Now that you have a GCP cluster set up and your config.yaml defined, you're ready to deploy all components of our platform.

First, run:

helm repo add astronomer

Then, run:

helm repo update

This will ensure that you pull the latest from our Helm repository. Finally, run:

helm install -f config.yaml --version=0.26 --namespace=astronomer <your-platform-release-name> astronomer/astronomer

This command will install the latest available patch version of Astronomer Software v0.26. To override latest and specify a patch, add it to the --version= flag in the format of 0.26.x. To install Astronomer Software v0.26.0, for example, specify --version=0.26.0. For information on all available patch versions, refer to Software Release Notes.

Once you run the commands above, a set of Kubernetes pods will be generated in your namespace. These pods power the individual services required to run our platform, including the Software UI and Houston API.

Step 10: Verify That All Pods Are Up

To verify all pods are up and running, run:

kubectl get pods --namespace <my-namespace>

You should see something like this:

$ kubectl get pods --namespace astronomer
newbie-norse-alertmanager-0 1/1 Running 0 30m
newbie-norse-cli-install-565658b84d-bqkm9 1/1 Running 0 30m
newbie-norse-commander-7d9fd75476-q2vxh 1/1 Running 0 30m
newbie-norse-elasticsearch-client-7cccf77496-ks2s2 1/1 Running 0 30m
newbie-norse-elasticsearch-client-7cccf77496-w5m8p 1/1 Running 0 30m
newbie-norse-elasticsearch-curator-1553734800-hp74h 1/1 Running 0 30m
newbie-norse-elasticsearch-data-0 1/1 Running 0 30m
newbie-norse-elasticsearch-data-1 1/1 Running 0 30m
newbie-norse-elasticsearch-exporter-748c7c94d7-j9cvb 1/1 Running 0 30m
newbie-norse-elasticsearch-master-0 1/1 Running 0 30m
newbie-norse-elasticsearch-master-1 1/1 Running 0 30m
newbie-norse-elasticsearch-master-2 1/1 Running 0 30m
newbie-norse-elasticsearch-nginx-5dcb5ffd59-c46gw 1/1 Running 0 30m
newbie-norse-fluentd-gprtb 1/1 Running 0 30m
newbie-norse-fluentd-qzwwn 1/1 Running 0 30m
newbie-norse-fluentd-rv696 1/1 Running 0 30m
newbie-norse-fluentd-t8mqt 1/1 Running 0 30m
newbie-norse-fluentd-wmjvh 1/1 Running 0 30m
newbie-norse-grafana-57df948d9-jv2m9 1/1 Running 0 30m
newbie-norse-houston-dbc647654-tcxbz 1/1 Running 0 30m
newbie-norse-kibana-58bdf9bdb8-2j67t 1/1 Running 0 30m
newbie-norse-kube-state-549f45544f-mcv7m 1/1 Running 0 30m
newbie-norse-nginx-7f6b5dfc9c-dm6tj 1/1 Running 0 30m
newbie-norse-nginx-default-backend-5ccdb9554d-5cm5q 1/1 Running 0 30m
newbie-norse-astro-ui-d5585ccd8-h8zkr 1/1 Running 0 30m
newbie-norse-prisma-699bd664bb-vbvlf 1/1 Running 0 30m
newbie-norse-prometheus-0 1/1 Running 0 30m
newbie-norse-registry-0 1/1 Running 0 30m

If you are seeing issues here, check out our guide on debugging your installation

Step 11: Configure DNS

Now that you've successfully installed Astronomer, a new Elastic Load Balancer (ELB) will have spun up in your GCP account. This ELB routes incoming traffic to our NGINX ingress controller.

Run $ kubectl get svc -n astronomer to view your ELB's CNAME, located under the EXTERNAL-IP column for the astronomer-nginx service.

$ kubectl get svc -n astronomer
astronomer-alertmanager ClusterIP <none> 9093/TCP 6m48s
astronomer-astro-ui ClusterIP <none> 8080/TCP 6m48s
astronomer-cli-install ClusterIP <none> 80/TCP 6m48s
astronomer-commander ClusterIP <none> 8880/TCP,50051/TCP 6m48s
astronomer-elasticsearch ClusterIP <none> 9200/TCP,9300/TCP 6m48s
astronomer-elasticsearch-exporter ClusterIP <none> 9108/TCP 6m48s
astronomer-elasticsearch-headless-discovery ClusterIP None <none> 9300/TCP 6m48s
astronomer-elasticsearch-nginx ClusterIP <none> 9200/TCP 6m48s
astronomer-grafana ClusterIP <none> 3000/TCP 6m48s
astronomer-houston ClusterIP <none> 8871/TCP 6m48s
astronomer-kibana ClusterIP <none> 5601/TCP 6m48s
astronomer-kube-state ClusterIP <none> 8080/TCP,8081/TCP 6m48s
astronomer-kubed ClusterIP <none> 443/TCP 6m48s
astronomer-nginx LoadBalancer 80:30318/TCP,443:31515/TCP,10254:32454/TCP 6m48s
astronomer-nginx-default-backend ClusterIP <none> 8080/TCP 6m48s
astronomer-postgresql ClusterIP <none> 5432/TCP 6m48s
astronomer-postgresql-headless ClusterIP None <none> 5432/TCP 6m48s
astronomer-prisma ClusterIP <none> 4466/TCP 6m48s
astronomer-prometheus ClusterIP <none> 9090/TCP 6m48s
astronomer-prometheus-blackbox-exporter ClusterIP <none> 9115/TCP 6m48s
astronomer-prometheus-node-exporter ClusterIP <none> 9100/TCP 6m48s
astronomer-registry ClusterIP <none> 5000/TCP 6m48s

You will need to create a new A record through your DNS provider using the external IP address listed above. You can create a single wildcard A record such as *, or alternatively create individual A records for the following routes:

Step 12: Verify You Can Access the Software UI

Go to app.BASEDOMAIN to see the Software UI.

Consider this your new Airflow control plane. From the Software UI, you'll be able to both invite and manage users as well as create and monitor Airflow Deployments on the platform.

Step 13: Verify Your TLS Setup

To check if your TLS certificates were accepted, log in to the Software UI. Then, go to app.BASEDOMAIN/token and run:

curl -v -X POST https://houston.BASEDOMAIN/v1 -H "Authorization: Bearer <token>"

Verify that this output matches with that of the following command, which doesn't look for TLS:

curl -v -k -X POST https://houston.BASEDOMAIN/v1 -H "Authorization: Bearer <token>"

Next, to make sure the registry is accepted by Astronomer's local docker client, try authenticating to Astronomer with the Astronomer CLI:

astro auth login <your-astronomer-base-domain>

If you can log in, then your Docker client trusts the registry. If Docker does not trust the Astronomer registry, run the following and restart Docker:

$ mkdir -p /etc/docker/certs.d
$ cp privateCA.pem /etc/docker/certs.d/

Finally, try running $ astro deploy on a test deployment. Create a deployment in the Software UI, then run:

$ mkdir demo
$ cd demo
$ astro airflow init
$ astro deploy -f

Check the Airflow namespace. If pods are changing at all, then the Houston API trusts the registry.

If you have Airflow pods in the state "ImagePullBackoff", check the pod description. If you see an x509 error, ensure that you added the privateCaCertsAddToHost key-value pairs to your Helm chart. If you missed these during installation, follow the steps in Apply a Platform Configuration Change on Astronomer to add them after installation.

What's Next

To help you make the most of Astronomer Software, check out the following additional resources:

Astronomer Support Team

If you have any feedback or need help during this process and aren't in touch with our team already, a few resources to keep in mind:

For detailed guidelines on reaching out to Astronomer Support, reference our guide here.