error when creating "deployment.yaml": Deployment in version "v1" cannot be handled as a Deployment

I am new to DevOps. I wrote a deployment.yaml file for a Kubernetes cluster I just created on Digital Oceans. Creating the deployment keeps bringing up errors that I can't decode for now. This is just a test deployment in preparation for the migration of my company's web apps to kubernetes.

I tried editing the content of the deployment to look like conventional examples I've found. I can't even get this simple example to work. You may find the deployment.yaml content below.

--- kind: Deployment apiVersion: apps/v1 metadata: name: testit-01-deployment spec: replicas: 4 #number of replicas generated selector: #assigns labels to the pods for future selection matchLabels: app: testit version: v01 template: metadata: Labels: app: testit version: v01 spec: containers: -name: testit-container image: teejayfamo/testit ports: -containerPort: 80 

I ran this line on cmd in the folder container:

kubectl apply -f deployment.yaml --validate=false

Error from server (BadRequest): error when creating "deployment.yaml": Deployment in version "v1" cannot be handled as a Deployment: v1.Deployment.Spec: v1.DeploymentSpec.Template: v1.PodTemplateSpec.Spec: v1.PodSpec.Containers: []v1.Container: decode slice: expect [ or n, but found {, error found in #10 byte of ...|tainers":{"-name":"t|..., bigger context ...|:"testit","version":"v01"}},"spec":{"containers":{"-name":"testit-container","image":"teejayfamo/tes|...

I couldn't even get any information on this from my search. I can't just get the deployment created. Pls, who understands and can put me through?

1

4 Answers

Since this is the top result of the search, I thought I should add another case when this can occur. In my case, it was coming because there was no double quote on numeric env. var. Log did provide a subtle hint, but it was not very helpful.

Log

..., bigger context ...|c-server-service"},{"name":"SERVER_PORT","value":80}] 

Env variable - the value of SERVER_PORT needs to be in double quote.

env: - name: SERVER_HOST value: grpc-server-service - name: SERVER_PORT value: "80" 

Kubernetes issue for reference.

6

There are syntax errors in your yaml file.

This should work.

--- kind: Deployment apiVersion: apps/v1 metadata: name: testit-01-deployment spec: replicas: 4 #number of replicas generated selector: #assigns labels to the pods for future selection matchLabels: app: testit version: v01 template: metadata: labels: app: testit version: v01 spec: containers: - name: testit-container image: teejayfamo/testit ports: - containerPort: 80 

The problem was:

  • Labels should be labels
  • The syntax of - name: and - containerPort were not formatted properly in spec.containers section.

Hope this helps.

3

In short -> Syntax Error

The mistake I was doing:

ports: -containerPort: 8081 

the above snippet causing the following error:

Error from server (BadRequest): error when creating ".\\deployment.yml": Deployment in version "v1" cannot be handled as a Deployment: json: cannot unmarshal object into Go struct field Container.spec.template.spec.containers.ports of type []v1.ContainerPort

And this is how I corrected:

ports: - containerPort: 8081 

so the difference was -containerPort (wrong one) and - containerPort (correct one).

Just to add, in my case, I turned up this result, but ultimately, the problem I had was that I had defined the same environment variable twice

Example:

... env: - name: FOO value: "bar" - name: FOO value: "bar" 

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