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I also had this question, but never found the answer. I ended up using

kustomize

overlays w/ the Kubernetes provider to accomplish what I needed.

Transformations allow you to modify resources definitions, but not make arbitrary edits to the YAML. For example, you can change the annotations for a Pod defined in YAML/Helm/Kustomize, but you couldn’t use transformations to define a new resource or section of YAML. If you have particular use cases in mind that aren’t supported, you’re welcome to open an issue on the pulumi-kubernetes repo.

Thanks, Levi. What is the best way, then, to add values to a YAML file that contains K8s resources? Say, to add labels to a Pod, for example?

There are a few examples in the API docs here: https://www.pulumi.com/docs/reference/pkg/kubernetes/yaml/configgroup/#yaml-with-transformations For Pod labels, it should be something like (untested):

func(state map[string]interface{}, opts ...pulumi.ResourceOption) {
                        if state["kind"] == "Pod" {
                            metadata := state["metadata"].(map[string]interface{})
                            metadata["labels"] = map[string]interface{}{"foo": pulumi.String("bar")}
                        }
                    },

Hello @gorgeous-egg-16927 thank you for example, what about a bit more difficult case, for example I need to change a value of configmap which contains json, e.g

kind: ConfigMap

metadata:

name: cwagentconfig

namespace: amazon-cloudwatch

data:

cwagentconfig.json: |

{

"agent": {

"region": "{{region_name}}"

},

"logs": {

"metrics_collected": {

"kubernetes": {

"cluster_name": "{{cluster_name}}",

"metrics_collection_interval": 60

}

},

"force_flush_interval": 5

}

}

and I need to change cluster_name, if I put something like this:

if kind, ok := state["kind"]; ok && kind == "ConfigMap" && state["metadata"].(map[string]interface{})["name"] == "cwagentconfig" {

data := state["data"].(map[string]interface{})

data["kubernetes"] = map[string]interface{}{"cluster_name": "MYCLUSTER"}

}

An error will come: ReadString: expects " or n, but found {, error found in #10 byte of ...|ernetes" apparently due to block with kubernetes starts with {