Lab 13.1 - Unable to get the short name 'ct' in step 5

sdalziel · May 2018

As stated in the subject, I'm working through excersice 13.1 and on step 5.

"5. Create the new object and view he resource using short and long name."

I have been successful in previous steps to show both the long and short names. Step 3 worked without issue.

I am receive data back when I use the long name "CronTab".

Please advise,

$ kubectl get crd

NAME AGE

crontabs.training.lfs258.com 25m

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$

$

$ kubectl describe crd

Name: crontabs.training.lfs258.com

Namespace:

Labels: <none>

Annotations: <none>

API Version: apiextensions.k8s.io/v1beta1

Kind: CustomResourceDefinition

Metadata:

Creation Timestamp: 2018-05-26T17:47:43Z

Generation: 1

Resource Version: 1343830

Self Link: /apis/apiextensions.k8s.io/v1beta1/customresourcedefinitions/crontabs.training.lfs258.com

UID: e470d8c3-610c-11e8-a61b-06901a6654e2

Spec:

Group: training.lfs258.com

Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Scope: Cluster

Version: v1

Status:

Accepted Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Conditions:

Last Transition Time: 2018-05-26T17:47:43Z

Message: no conflicts found

Reason: NoConflicts

Status: True

Type: NamesAccepted

Last Transition Time: 2018-05-26T17:47:43Z

Message: the initial names have been accepted

Reason: InitialNamesAccepted

Status: True

Type: Established

Events: <none>

$ kubectl create -f new-crontab.yaml

Error from server (AlreadyExists): error when creating "new-crontab.yaml": crontabs.training.lfs258.com "new-cron-object" already exists

$

$ kubectl get CronTab

NAME AGE

new-cron-object 22m

$ kubectl describe CronTab

Name: new-cron-object

Namespace:

Labels: <none>

Annotations: <none>

API Version: training.lfs258.com/v1

Kind: CronTab

Metadata:

Cluster Name:

Creation Timestamp: 2018-05-26T17:52:48Z

Resource Version: 1344196

Self Link: /apis/training.lfs258.com/v1/new-cron-object

UID: 9a18bcac-610d-11e8-a61b-06901a6654e2

Spec:

Cron Spec: */5 * * * *

Image: some-cron-image

Events: <none>

$

$

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$

$

$ kubetl get nct

kubetl: command not found

$ kubectl get nct

error: the server doesn't have a resource type "nct"

$ kubectl delete -f new-crontab.yaml

crontab.training.lfs258.com "new-cron-object" deleted

$

$

$ kubectl get CronTab

No resources found.

$ kubectl describe CronTab

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$ kubectl get crd

NAME AGE

crontabs.training.lfs258.com 29m

$ kubectl describe crd

Name: crontabs.training.lfs258.com

Namespace:

Labels: <none>

Annotations: <none>

API Version: apiextensions.k8s.io/v1beta1

Kind: CustomResourceDefinition

Metadata:

Creation Timestamp: 2018-05-26T17:47:43Z

Generation: 1

Resource Version: 1343830

Self Link: /apis/apiextensions.k8s.io/v1beta1/customresourcedefinitions/crontabs.training.lfs258.com

UID: e470d8c3-610c-11e8-a61b-06901a6654e2

Spec:

Group: training.lfs258.com

Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Scope: Cluster

Version: v1

Status:

Accepted Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Conditions:

Last Transition Time: 2018-05-26T17:47:43Z

Message: no conflicts found

Reason: NoConflicts

Status: True

Type: NamesAccepted

Last Transition Time: 2018-05-26T17:47:43Z

Message: the initial names have been accepted

Reason: InitialNamesAccepted

Status: True

Type: Established

Events: <none>

$

$

$ vim new-crontab.yaml

$

$

$ kubectl create -f new-crontab.yaml

error: unable to recognize "new-crontab.yaml": no matches for kind "CronTab" in version "training.lfs458.com/v1"

$ vim new-crontab.yaml

$

$

$ kubectl create -f new-crontab.yaml

crontab.training.lfs258.com "new-cron-object" created

$

$

$ kubectl get CronTab

NAME AGE

new-cron-object 11s

$

$

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$ kubectl describe ct

error: the server doesn't have a resource type "ct"

Sean

==Output==

$ kubectl get crd

NAME AGE

crontabs.training.lfs258.com 25m

$

$

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$

$

$ kubectl describe crd

Name: crontabs.training.lfs258.com

Namespace:

Labels: <none>

Annotations: <none>

API Version: apiextensions.k8s.io/v1beta1

Kind: CustomResourceDefinition

Metadata:

Creation Timestamp: 2018-05-26T17:47:43Z

Generation: 1

Resource Version: 1343830

Self Link: /apis/apiextensions.k8s.io/v1beta1/customresourcedefinitions/crontabs.training.lfs258.com

UID: e470d8c3-610c-11e8-a61b-06901a6654e2

Spec:

Group: training.lfs258.com

Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Scope: Cluster

Version: v1

Status:

Accepted Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Conditions:

Last Transition Time: 2018-05-26T17:47:43Z

Message: no conflicts found

Reason: NoConflicts

Status: True

Type: NamesAccepted

Last Transition Time: 2018-05-26T17:47:43Z

Message: the initial names have been accepted

Reason: InitialNamesAccepted

Status: True

Type: Established

Events: <none>

$ kubectl create -f new-crontab.yaml

Error from server (AlreadyExists): error when creating "new-crontab.yaml": crontabs.training.lfs258.com "new-cron-object" already exists

$

$ kubectl get CronTab

NAME AGE

new-cron-object 22m

$ kubectl describe CronTab

Name: new-cron-object

Namespace:

Labels: <none>

Annotations: <none>

API Version: training.lfs258.com/v1

Kind: CronTab

Metadata:

Cluster Name:

Creation Timestamp: 2018-05-26T17:52:48Z

Resource Version: 1344196

Self Link: /apis/training.lfs258.com/v1/new-cron-object

UID: 9a18bcac-610d-11e8-a61b-06901a6654e2

Spec:

Cron Spec: */5 * * * *

Image: some-cron-image

Events: <none>

$

$

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$

$

$ kubetl get nct

kubetl: command not found

$ kubectl get nct

error: the server doesn't have a resource type "nct"

$ kubectl delete -f new-crontab.yaml

crontab.training.lfs258.com "new-cron-object" deleted

$

$

$ kubectl get CronTab

No resources found.

$

$

$

$ kubectl describe CronTab

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$ kubectl get crd

NAME AGE

crontabs.training.lfs258.com 29m

$ kubectl describe crd

Name: crontabs.training.lfs258.com

Namespace:

Labels: <none>

Annotations: <none>

API Version: apiextensions.k8s.io/v1beta1

Kind: CustomResourceDefinition

Metadata:

Creation Timestamp: 2018-05-26T17:47:43Z

Generation: 1

Resource Version: 1343830

Self Link: /apis/apiextensions.k8s.io/v1beta1/customresourcedefinitions/crontabs.training.lfs258.com

UID: e470d8c3-610c-11e8-a61b-06901a6654e2

Spec:

Group: training.lfs258.com

Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Scope: Cluster

Version: v1

Status:

Accepted Names:

Kind: CronTab

List Kind: CronTabList

Plural: crontabs

Singular: crontab

Conditions:

Last Transition Time: 2018-05-26T17:47:43Z

Message: no conflicts found

Reason: NoConflicts

Status: True

Type: NamesAccepted

Last Transition Time: 2018-05-26T17:47:43Z

Message: the initial names have been accepted

Reason: InitialNamesAccepted

Status: True

Type: Established

Events: <none>

$

$

$ vim new-crontab.yaml

$

$

$ kubectl create -f new-crontab.yaml

error: unable to recognize "new-crontab.yaml": no matches for kind "CronTab" in version "training.lfs458.com/v1"

$ vim new-crontab.yaml

$

$

$ kubectl create -f new-crontab.yaml

crontab.training.lfs258.com "new-cron-object" created

$

$

$ kubectl get CronTab

NAME AGE

new-cron-object 11s

$

$

$ kubectl get ct

error: the server doesn't have a resource type "ct"

$ kubectl describe ct

error: the server doesn't have a resource type "ct"

chrispokorni · May 2018

Hi Sean,

I believe your issue is again yaml whitespace. If all is good in your crd.yaml, describe crd should also show you the Short Names: ct, like below:


...
Spec:
  Group:  training.lfs258.com
  Names:
    Kind:       CronTab
    List Kind:  CronTabList
    Plural:     crontabs
    Short Names:
      ct
...

If in your crd.yaml, the "- ct" is not properly alligned, you will not get an error during the create -f crd.yaml, and you will receive the error of unfound resource type. I am not exactly sure why there is no error at create. However, I did notice this before too, and it was also the last line that was giving me headaches.

If all whitespace is correct in crd.yaml, you should be able to obtain successful outputs for all attempts at get ct, get crontab, get crontabs, get CronTab.

If you downloaded the solutions tar file, you should have a good crd.yaml which works.

If not, try this:


apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: crontabs.training.lfs458.com
         # This name must match names below.
         # &lt;plural&gt;.&lt;group&gt; syntax
spec:
  scope: Cluster    #Could also be Namespaced
  group: training.lfs458.com
  version: v1
  names:
    kind: CronTab      #Typically CamelCased for resource manifest
    plural: crontabs   #Shown in URL
    singular: crontab  #Short name for CLI alias
    shortNames:
    - ct               #CLI short name

Have fun with YAML )

-Chris

sdalziel · May 2018

Thanks Chris,

I found a couple of typos in my YAML files that were the cause of my issues with this exercise.

Thank you again for you help.

Sean

Lab 13.1 - Unable to get the short name 'ct' in step 5

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