CODEWITHSUNDEEP
kubernetes-helm
sebastianwth
sebastianwth

Reputation: 187

helm - overwrite all values in a specific key in the values files

I have 2 values files with many entries. I'd like to overwrite all entries for a specific key using - "helm template . -f values.yaml -f values-prod.yaml'

For example:

values.yaml

key:
  a: 1
  b: 2
  c: 3

key2:
  d: 4
  f: 5

values-prod.yaml

key:
 c: 33

I'd like the generated values.yaml to be:

key:
  c: 33

key2:
  d: 4
  f: 5

I understand I can setup a value of a key to null for all the sub-keys I want to remove and that would remove it, but I'm wondering if there is a better way.

Upvotes: 3

Views: 4539

Answers (1)

David Maze
David Maze

Reputation: 160023

There is not. If you think there's a possibility you will want the value to be unset in some or many environments, the best approach is to not provide a default value for it in your chart's values.yaml file.

# values.yaml
key:
  c: 3

# values-dev.yaml
key:
  a: 1

# values-prod.yaml
key:
  c: 33

You're probably aware of the Helm default template function and normal if conditionals, but you can also provide these defaults in code, which on the one hand lets you compute them but on the other can make them be harder to override.

# Use `key2.c` if it's set, but `key.c` otherwise
data:
  c: {{ .Values.key2.c | default .Values.key.c | default "no c value" | quote }}

(If the values.yaml file is the one in your Helm chart, next to the Chart.yaml file, Helm includes it automatically and at the first position in the option list, and you do not need a helm install -f values.yaml option.)

Upvotes: 3

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