kubectl "--dry-run" with "-o yaml" does not show 'apiVersion' neither 'kind'

[carlosrmendes]

Is this a BUG REPORT or FEATURE REQUEST? (choose one): BUG REPORT

Kubernetes version (use kubectl version): 1.10.0

Environment:

• Cloud provider or hardware configuration: baremetal
• OS (e.g. from /etc/os-release): centos 7
• Kernel (e.g. uname -a): 3.10.0-693.17.1.el7.x86_64
• Install tools: kubeadm
• Others:

What happened:
the output of kubectl create namespace my-namespace -o yaml --dry-run does not show 'apiVersion' neither 'kind' as previous versions.
kubectl create namespace my-namespace -o yaml --dry-run
Output:
metadata:
creationTimestamp: null
name: my-namespace
spec: {}
status: {}

What you expected to happen:
expected the output of previous versions, like:
$ kubectl create namespace my-namespace -o yaml --dry-run
Output:
apiVersion: v1
kind: Namespace
metadata:
creationTimestamp: null
name: my-namespace
spec: {}
status: {}

I use the "--dry-run" and "-o yaml" to execute kubectl create namespace my-namespace -o yaml --dry-run | kubectl apply -f -

[nikhita]

Can you tell what kubectl version gives you?

I tried both for:

Client Version: version.Info{Major:"1", Minor:"10+", GitVersion:"v1.10.1-beta.0.17+a22f9fd34871d9", GitCommit:"a22f9fd34871d9dc9e5db2c02c713821d18ab2cd", GitTreeState:"clean", BuildDate:"2018-04-01T13:05:59Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10+", GitVersion:"v1.10.1-beta.0.17+a22f9fd34871d9", GitCommit:"a22f9fd34871d9dc9e5db2c02c713821d18ab2cd", GitTreeState:"clean", BuildDate:"2018-04-01T13:05:59Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}

and

Client Version: version.Info{Major:"1", Minor:"11+", GitVersion:"v1.11.0-alpha.0.1947+11d28128a71942", GitCommit:"11d28128a719427373a059d10c9407b930f2b324", GitTreeState:"clean", BuildDate:"2018-04-01T12:50:20Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"11+", GitVersion:"v1.11.0-alpha.0.1947+11d28128a71942", GitCommit:"11d28128a719427373a059d10c9407b930f2b324", GitTreeState:"clean", BuildDate:"2018-04-01T12:50:20Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}

and it gives me the correct output.

$ kubectl create namespace my-namespace -o yaml --dry-run
apiVersion: v1
kind: Namespace
metadata:
  creationTimestamp: null
  name: my-namespace
spec: {}
status: {}

[carlosrmendes]

fresh install on centos 7.4: yum install kubelet kubeadm kubectll

kubectl version

Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"clean", BuildDate:"2018-03-26T16:55:54Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"clean", BuildDate:"2018-03-26T16:44:10Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

kubectl create namespace my-namespace -o yaml --dry-run

metadata:
  creationTimestamp: null
  name: my-namespace
spec: {}
status: {}

[mikedoug]

I too had this problem with:

Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"clean", BuildDate:"2018-03-26T16:55:54Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"clean", BuildDate:"2018-03-26T16:44:10Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

# kubectl create namespace my-namespace -o yaml --dry-run
metadata:
  creationTimestamp: null
  name: my-namespace
spec: {}
status: {}

[everydaynerd]

Having same issue with Version 1.10.0 - This is breaking a lot of our build jobs... 👎

[mikedoug]

You can work around it by injecting:

apiVersion: v1
kind: <typehere>

I ran into this with Istio's installation script for auto injecting the side car. It was one location in one script, so this type of work around didn't hurt too badly.

[mikedoug]

If you look at the version of 1.10 @nikhita is running she's on a beta release of 1.10.1 -- so perhaps there's a fix already coming. Those of us affected are using the current stable release of 1.10.0.

[jsenon]

still have issue with 1.10.1 beta:

./kubectl.dms create namespace my-namespace -o yaml --dry-run
metadata:
  creationTimestamp: null
  name: my-namespace
spec: {}
status: {}
 ```

./kubectl.dms version
Client Version: version.Info{Major:"1", Minor:"10+", GitVersion:"v1.10.1-beta.0", GitCommit:"75861c097c6499acc662c1094b3e95de851bd87a", GitTreeState:"clean", BuildDate:"2018-03-26T17:27:29Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
```

[nikhita]

This was fixed in https://github.com/kubernetes/kubernetes/pull/61808. This patch was cherry-picked into release-1.10 - https://github.com/kubernetes/kubernetes/pull/61836.

The latest 1.10 tag is v1.10.1-beta.0, which was created 9 days ago. This patch was merged 6 days ago into the 1.10 branch. It should be there on the next released tag.

(Also, it worked for me above because I was on the release-1.10 branch)

[nikhita]

Just confirmed with sig-release, 1.10.1 should be out mid next week.

[jsenon]

That’s clear thanks

[nikhita]

Closing this since the fix has been merged on master and cherry-picked.

/close