The cluster autoscaler for Vultr scales nodes in a VKE cluster.
Vultr Kubernetes Engine (VKE) is the managed kubernetes solution provided by Vultr.
VKE lets users create Node Pools, i.e. groups of nodes each of the same type.
The size of a Node Pool can be configured at any moment. The user cannot select specific nodes to be deleted when downsizing a Node Pool, rather, VKE will randomly select nodes to be deleted to reach the defined size, even if a node is not healthy or has been manually deleted.
Nodes in a Node Pool are considered disposable: they can be deleted and recreated at any moment, deleting a single node outside of VKE will be recreated by Vultr after a small amount of time.
It is mandatory to define the cloud configuration file cloud-config. You can see an example of the cloud config file at examples/cluster-autoscaler-secret.yaml, it is an INI file with the following fields:
The (JSON) configuration file of the Vultr cloud provider supports the following values:
cluster_id: the ID of the VKE cluster.token: the Vultr API key literally defined.
Configuring the autoscaler such as if it should be monitoring node pools or what the minimum and maximum values. Should be configured through the Vultr API. The autoscaler will pick up any changes and adjust accordingly.
Make sure you are inside the cluster-autoscaler path of the autoscaler repository.
Create the docker image:
make container
tag the generated docker image and push it to a registry.