Configuring Kustomize Transformers for Cluster API
In November 2019 I wrote an article on using kustomize with Cluster API (CAPI) manifests. The idea was to use kustomize to simplify the management of CAPI manifests for clusters that are generally similar but have minor differences (like the AWS region in which they are running, or the number of Machines in a MachineDeployment). In this post, I’d like to show a slightly different way of using kustomize with Cluster API that involves configuring the kustomize transformers.
If you aren’t familiar with kustomize, I’d recommend having a look at the kustomize web site and/or reading my introductory post. A transformer in kustomize is the part that is responsible for modifying a resource, or gathering information about a resource over the course of a kustomize build process. This page has some useful terminology definitions.
Looking back at the earlier article on using kustomize with CAPI, you can see that—due to the links/references between objects—modifying the name of the AWSCluster object also means modifying the reference to the AWSCluster object from the Cluster object. The same goes for the KubeadmConfigTemplate and AWSMachineTemplate objects referenced from a MachineDeployment. Out of the box, the namePrefix transformer will change the names of these Continue reading
