What's the correct way of creating a ConfigMap from a file using a YAML syntax?

Question

I can create a ConfigMap without issues with kubectl create configmap settings --from-file settings.yaml, but I don't want to manually create it but as part of a helm install.

So, I created a template file:

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Values.settingsConfigMap }}
data:
  settings.yaml: |-
{{ .Files.Get "settings.yaml" | indent 4}}

but whenever I run helm install I get an error saying that

invalid type for io.k8s.api.core.v1.ConfigMap.data: got "map", expected "string"

So, what can I do to create this ConfigMap with Helm loading the content from a YAML file?

UPDATE

It turns out the error mentioned above is related to some issues with the indentation. By removing the indent 4, I managed to get a step further, but now it's failing because all my settings are detected as unknown fields, for example:

unknown field "customers" in io.k8s.api.core.v1.ConfigMap, ValidationError(ConfigMap): unknown field "deploy_name" in io.k8s.api.core.v1.ConfigMap, ValidationError(ConfigMap): unknown field "system" in io.k8s.api.core.v1.ConfigMap

deploy_name, system and customers are the top level keys of my settings.yaml file.

Which helm version are you using? Can you try to update to newer? It works for me with v3.2.4 — acid_fuji
– acid_fuji, Commented Oct 13, 2020 at 9:31
@thomas version.BuildInfo{Version:"v3.3.4", GitCommit:"a61ce5633af99708171414353ed49547cf05013d", GitTreeState:"dirty", GoVersion:"go1.15.2"} — user4093955
– user4093955, Commented Oct 13, 2020 at 9:56

Edric · Accepted Answer · 2020-11-10 13:12:08Z

2

I found the answer.

The error mentioned in the update is the outcome of removing indent 4. By removing that, the YAML used by Helm is screwed up, hence that's why it doesn't understand those fields.

So, why did it fail when I had the indent 4? The reason is the missing white space before the }. With {{ .Files.Get "settings.yaml" | indent 4 }}, everything is good.

edited Nov 10, 2020 at 13:12

Edric

27.2k13 gold badges88 silver badges97 bronze badges

answered Oct 13, 2020 at 10:35

user4093955

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

What's the correct way of creating a ConfigMap from a file using a YAML syntax?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related