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https://github.com/astronomer/astronomer

Helm Charts for the Astronomer Platform, Apache Airflow as a Service on Kubernetes
https://github.com/astronomer/astronomer

apache-airflow astronomer-platform astronomer-software docker kubernetes

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Helm Charts for the Astronomer Platform, Apache Airflow as a Service on Kubernetes

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# Astronomer Platform Helm Charts



This repository contains the helm charts for deploying the [Astronomer Platform](https://github.com/astronomer/astronomer) into a Kubernetes cluster.



Astronomer is a commercial "Airflow as a Service" platform that runs on Kubernetes. Source code is made available for the benefit of our customers, if you'd like to use the platform [reach out for a license](https://www.astronomer.io/get-astronomer).



## Architecture



![Astronomer Architecture](https://assets2.astronomer.io/main/enterpriseArchitecture.svg "Astronomer Architecture")



## Docker images



Docker images for deploying and running Astronomer are currently available on

[Quay.io/Astronomer](https://quay.io/organization/astronomer).



## Documentation



You can read the Astronomer platform documentation at https://docs.astronomer.io/enterprise. For a record of all user-facing changes to the Astronomer platform, see [Release Notes](https://docs.astronomer.io/enterprise/release-notes).



## Contributing



We welcome any contributions:



* Report all enhancements, bugs, and tasks as [GitHub issues](https://github.com/astronomerio/helm.astronomer.io/issues)

* Provide fixes or enhancements by opening pull requests in GitHub



## Local Development



When doing chart development, you only need python >=3.11 and some python packages. The test environment for unit testing will be installed into `venv` when you run `make unittest-charts`, or you can setup the venv by running `make unittest-requirements`.



The `DEBUG` env var will make it easier to debug a failure by leaving the helm values files generated by pytest test cases in place, and by printing out the helm command that was used to render the charts.



Setting `INTERNET_ACCESS=false` env will attempt to avoid connecting to the internet for things like `helm repo update`. This obviously requires setting up your developer environment beforehand if you want to actually be able to run tests.



Setting `PYTEST_ADDOPTS` to any pytest args will modify how pytest runs.



For example, you could run `make unittest-chart PYTEST_ADDOPTS='--pdb -k 1.30' INTERNET_ACCESS=false DEBUG=1` if you only want to debug kubernetes 1.30 tests, enter pdb when there is a failure, keep values files, and avoid internet access.



### Development against a local KinD cluster



These components are advised for local development:



- docker (make sure your user has permissions - try 'docker ps')

- kubectl

- [kind](https://github.com/kubernetes-sigs/kind#installation-and-usage)

- [mkcert](https://github.com/FiloSottile/mkcert) (make sure mkcert is in your PATH)

- [helm](https://helm.sh)

- python >=3.11



Run this script from the root of this repository:



```sh

bin/reset-local-dev

```



Each time you run the script, the platform will be fully reset to the current helm chart.



### Customizing the local deployment



#### Turn on or off parts of the platform



Modify the "tags:" in configs/local-dev.yaml

- platform: core Astronomer components

- logging (large impact on RAM use): ElasticSearch, Kibana, Fluentd (aka 'EFK' stack)

- monitoring: Prometheus



#### Load a Docker image into KinD's nodes (so it's available for pods)



```sh

kind load docker-image $your_local_image_name_with_tag

```



#### Make use of that image



Make note of your pod name



```sh

kubectl get pods -n astronomer

```



Find the corresponding deployment, daemonset, or statefulset



```sh

kubectl get deployment -n astronomer

```



Replace the pod with the new image

Look for "image" on the appropriate container and replace with the local tag,

and set the pull policy to "Never".



```sh

kubectl edit deployment -n astronomer 

```



#### Specify the Kubernetes version



```sh

bin/reset-local-dev -K 1.28.6

```



#### Locally test HA configurations



You need a powerful computer to run the HA testing locally. 28 GB or more of memory should be available to Docker.



Environment variables:



- USE_HA: when set, will deploy using HA configurations

- CORDON_NODE: when set, will cordon this node after kind create cluster

- MULTI_NODE: when set, will deploy kind with two worker nodes



Scripts:



- Use bin/run-ci to start the cluster

- Modify / use bin/drain.sh to test draining



Example:



```sh

export USE_HA=1

export CORDON_NODE=kind-worker

export MULTI_NODE=1

bin/run-ci

```



After the platform is up, then do



```sh

bin/drain.sh

```



#### How to upgrade airflow chart json schema



Every time we upgrade the airflow chart we will also need to update the json schema file with the list of acceptable top level params (eventually this will be fixed on the OSS side but for now this needs to be a manual step https://github.com/astronomer/issues/issues/3774). Additionally the json schema url will need to be updated to something of the form https://raw.githubusercontent.com/apache/airflow/helm-chart/1.x.x/chart/values.schema.json. This param is found in astronomer/values.schema.json at the astronomer.houston.config.deployments.helm.airflow.$ref parameter



To get a list of the top level params it is best to switch to the apache/airflow tagged commit for that chart release. Then run the ag command to get a list of all top level params.



Example:



```

git checkout tags/helm-chart/1.2.0

git grep -ho "\.Values\.\w\+" | sort -u

```



The values output by this command will need to be inserted manually into astronomer/values.schema.json at the `astronomer.houston.config.deployments.helm.airflow.allOf` parameter. There are two additional params that need to be at this location outside of what is returned from above. They are `podMutation` and `useAstroSecurityManager`. These can be found by running the same ag command against the astronomer/airflow-chart values.yaml file.



### Searching code



We include k8s schema files and calico CRD manifests in this repo to aid in testing, but their inclusion makes grepping for code a bit difficult in some cases. You can exclude those files from your `git grep`` results if you use the following syntax:



```sh

git grep .Values.global. -- ':!tests/k8s_schema' ':!bin/kind'

```



The `--` ends the `git` command arguments and indicates that the rest of the arguments are filenames or `pathspecs`. `pathspecs` begin with a colon. `:!tests/k8s_schema` is a pathspec that instructs git to exclude the directory `tests/k8s_schema`.



Note that this `pathspec` syntax is a `git` feature, so this exclusion technique will not work with normal `grep`.



## License



The code in this repo is licensed Apache 2.0 with Commons Clause, however it installs Astronomer components that have a commercial license, and requires a commercial subscription from Astronomer, Inc.



## Optional schema validation



The ./values.schema.json.example file can be used to validate the helm values you are using work with the default airflow chart shipped with this repo. To use it remove the .example postfix from the file and proceed with the helm lint, install, and upgrade commands as normal.