helm chart for fastAPI

what is it about

packaging the fastapi as docker image and deploying as helm chart

Building docker image

Clone the repository

https://github.com/uptownaravi/LearnfastAPI.git

change directories into /FastAPI_HelmChart/
in the Dockerfile we have a ubuntu base image on which we build the layers to install application and dependencies.

Using my sample application from previous blog
https://dev.to/harisharavindan/learning-fastapi-with-a-sample-python-library-5f2n

build the image

docker build . -t fast:v2 

Docker image built is stored in github package ( ref https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry )

ghcr.io/uptownaravi/fast:v2

any changes required can be done to the dockerfile and build a new image from that

Creating an Helm chart

have created a basic helm chart which uses the image built from the above dockerfile

change directories in the cloned repository folder

cd FastAPI_HelmChart/helmChart-fastAPI/

explore the chart templates and values.

• we have set the docker image to ghcr.io/uptownaravi/fast:v2
• health check is at localhost:80/health
• service is exposed at 80 as we had set that in the dockerfile

do a dry-run to check what is being installed
make sure to be in the directory FastAPI_HelmChart/helmChart-fastAPI/ where the Chart.yaml is available

helm install fastencode . --dry-run

this installs the helm release fastencode which creates the deployment, service and related resources

check the details of the installed chart

kubectl get all -l='app.kubernetes.io/instance=fastencode'

we can port-forward the service to check the app

kubectl port-forward svc/fastapi 8080:80

this will forward the port 80 of the pod to the local host 8080
check fastapi ui with url http://localhost:8080/docs

to uninstall the release

helm uninstall fastencode