ExternalName type service cannot be created if without spec.ports.

[chengzhang1016]

What keywords did you search in Kubernetes issues before filing this one? (If you have found any duplicates, you should instead reply there.): external service

Kubernetes version (use kubectl version):
v1.5.0-alpha.0.2084+162d80eced3989

What happened:
ExternalName type service cannot be created if without spec.ports.

How to reproduce it (as minimally and precisely as possible):
Create a ExternalName type service: kubectl create -f ExternalName type service

{
    "kind": "Service",
    "apiVersion": "v1",
    "metadata": {
        "name": "my-service"
    },
    "spec": {
        "type": "ExternalName",
        "externalName": "my.database.example.com"
    }
}

Actual results:
ExternalName type service created failed.

# kubectl create -f externalname-service.json
error: error validating "externalname-service.json": error validating data: field ports: is required; if you choose to ignore these errors, turn validation off with --validate=false

Expected results:
Service should be created successful.

Anything else do we need to know:
You can refer to the docs about externalname type service: https://github.com/kubernetes/kubernetes.github.io/blob/release-1.4/docs/user-guide/services/index.md
The docs indicated that An ExternalName service is a special case of service that does not have selectors. It does not define any ports or endpoints. Rather, it serves as a way to return an alias to an external service residing outside the cluster.

[mdshuai]

@derekwaynecarr @therc

[adohe-zz]

this should be some validation error.

[chengzhang1016]

@mdshuai @derekwaynecarr @therc
I opened this issue base on below three merged PRs:
kubernetes/website#1063
#30599
#30931

[thaniyarasu]

This is working .

{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "my-service"
},
"spec": {
"type": "ExternalName",
"externalName": "my.database.example.com",
"ports": [{ "port": 3000 }]
}
}

[chengzhang1016]

@thaniyarasu No. My means is that ExternalName type service cannot be created if without spec.ports.
You can try again via your josn without "ports": [{ "port": 3000 }]

You can refer to the docs about externalname type service: https://github.com/kubernetes/kubernetes.github.io/blob/release-1.4/docs/user-guide/services/index.md
The docs indicated that An ExternalName service is a special case of service that does not have selectors. It does not define any ports or endpoints. Rather, it serves as a way to return an alias to an external service residing outside the cluster.

[chengzhang1016]

@thaniyarasu ExternalName type service should be created successful without spec.ports by document: https://github.com/kubernetes/kubernetes.github.io/blob/release-1.4/docs/user-guide/services/index.md

[adohe-zz]

@chengzhang1016 I opened a PR #34789 to create ExternalName service through kubectl, you may want to take a look.

[chengzhang1016]

@hodovska Verified. Thanks for your fixing.