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Cluster Autoscaler on Ionos Cloud Managed Kubernetes

The cluster autoscaler for the Ionos Cloud scales worker nodes within Managed Kubernetes cluster node pools. It can be deployed as Deployment in your cluster.

Deployment

Managed

Managed autoscaling can be enabled or disabled via Kubernetes Manager in the DCD or API. In this case a Deployment is not needed, since it will be deployed in the managed Kubernetes controlplane.

In-cluster

If you don't have a token, generate one:

curl -u '<username>:<password>' https://api.ionos.com/auth/v1/tokens/generate

Store the token in a secret:

kubectl create secret generic cloud-config --from-literal=token=MY_TOKEN

Edit example-values.yaml and deploy using helm:

helm install ionoscloud-cluster-autoscaler autoscaler/cluster-autoscaler -f example-values.yaml

Configuration

The IONOS_ADDITIONAL_HEADERS environment variable can be used to configure the client to send additional headers on each Ionos Cloud API request, such as X-Contract-Number. This can be useful for users with multiple contracts. The format is a semicolon-separated list of key:value pairs, e.g. IONOS_ADDITIONAL_HEADERS="X-Contract-Number:1234657890".

Development

The unit tests use mocks generated by mockery. To update them run:

mockery --inpackage --testonly --case snake --boilerplate-file ../../../hack/boilerplate/boilerplate.generatego.txt --name APIClient
mockery --inpackage --testonly --case snake --boilerplate-file ../../../hack/boilerplate/boilerplate.generatego.txt --name IonosCloudManager

Debugging

The global logging verbosity controlled by the --v flag is passed on to the Ionos Cloud SDK client logger. Verbosity 5 maps to Debug and 7 to Trace. Do not enable this in production, as it will print full request and response data.

Build an image

Build and push a docker image in the cluster-autoscaler directory:

make build-in-docker BUILD_TAGS=ionoscloud
make make-image BUILD_TAGS=ionoscloud TAG='<tag>' REGISTRY='<registry>'
make push-image BUILD_TAGS=ionoscloud TAG='<tag>' REGISTRY='<registry>'

If you're using rootless podman, create a symlink to docker and build the image using:

make make-image BUILD_TAGS=ionoscloud TAG='<tag>' REGISTRY='<registry>' DOCKER_NETWORK=host