what server version do you have (output of kubectl version)? dots are allowed in 1.4.x+ (added in #25458)

Kubectl version:

Client Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.1", GitCommit:"f38e43b221d08850172a9a4ea785a86a3ffa3b3a", GitTreeState:"clean", BuildDate:"2017-10-11T23:27:35Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"windows/amd64"}

Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.7", GitCommit:"8e1552342355496b62754e61ad5f802a0f3f1fa7", GitTreeState:"clean", BuildDate:"2017-09-28T23:56:03Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}

I'm having the same issue trying to add yaml files. I've tried several files and get the same error on all of them? I'm on a mac and just did a new install of kubctl with homebrew, which was v1.8.0.

Is there any update on this? The same file is not working with a 1.4.6 version as well. Is there some specific way in which we need to specify the key value pairs in a config map using the file method?

Is there any update on this?

not really, the described scenario works as expected for me:

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.7", GitCommit:"8e1552342355496b62754e61ad5f802a0f3f1fa7", GitTreeState:"clean", BuildDate:"2018-05-03T17:29:46Z", GoVersion:"go1.8.7", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.7", GitCommit:"8e1552342355496b62754e61ad5f802a0f3f1fa7", GitTreeState:"clean", BuildDate:"2018-05-03T17:29:46Z", GoVersion:"go1.8.7", Compiler:"gc", Platform:"darwin/amd64"}

$ cat game.properties 
enemies.name=aliens
lives.count=3
enemies.cheat=true
enemies.cheat=noGoodRotten
secret.code=UUDDLRLRBABAS
secret.code=true
secret.code=30

$ kubectl create configmap myconfigmap --from-file=game.properties
configmap "myconfigmap" created

$ kubectl get configmap myconfigmap -o yaml
apiVersion: v1
data:
  game.properties: |
    enemies.name=aliens
    lives.count=3
    enemies.cheat=true
    enemies.cheat=noGoodRotten
    secret.code=UUDDLRLRBABAS
    secret.code=true
    secret.code=30
kind: ConfigMap
metadata:
  creationTimestamp: 2018-05-03T17:33:12Z
  name: myconfigmap
  namespace: default
  resourceVersion: "144"
  selfLink: /api/v1/namespaces/default/configmaps/myconfigmap
  uid: 0dfe1b7a-4ef8-11e8-bcdd-6a000155e300

I finally got what is wrong. When i specify the file path, i get the error specified. If the file is in the same location from where i am running the command the command executes successfully.
eg: >kubectl create configmap myconfigmap1 --from-file="C:\Users\ansheno\Desktop\password.txt" gives me the error

error: "C:\Users\ansheno\Desktop\password.txt" is not a valid key name for a ConfigMap: a valid config key must consist of alphanumeric characters, '-', '_' or '.' (e.g. 'key.name', or 'KEY_NAME', or 'key-name', regex used for validation is '[-._a-zA-Z0-9]+')

ah, great. #63439 will fix that.

in the meantime, you can do --from-file=password.txt="C:\Users\ansheno\Desktop\password.txt"

Thanks a lot!. One more observation was that the command works if you specify the path to the directory which contains the file instead of the path to the file itself.

Hi, what would be eta of this fix? Also, will it be available in all the versions of kubectl?

it will be in 1.11, targeted for end of june (https://github.com/kubernetes/sig-release/blob/master/releases/release-1.11/release-1.11.md)