Solution for configmap --from-file

[hubert-wojtowicz]

Data for config.txt did not create correct key-value pairs according to the provided solution.
solution number 3 here

[syaffers]

There's a difference in the options --from-file and --from-env-file.

According to https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#-em-configmap-em-

Name	Shorthand	Default	Usage
...
from-env-file			Specify the path to a file to read lines of key=val pairs to create a configmap (i.e., a Docker .env file).
from-file		[]	Key file can be specified using its file path, in which case file basename will be used as configmap key, or optionally with a key and file path, in which case the given key will be used. Specifying a directory will iterate each named file in the directory whose basename is a valid configmap key.
...

So if you pass a file to the --from-file option, the ConfigMap key will contain the contents of the file itself, newlines and all. With --from-env-file, if your file is structured as

key1=val1
key2=val2

it will read these as KV pairs into

{
  "key1": "val1",
  "key2": "val2"
}