Description of problem:

When creating a template and trying create a parameter for the following:

pod.spec.containers[0].readinessProbe.httpGet.port
service.spec.ports[0].targetPort 

Error is seen. 

“invalid: spec.template.spec.containers[0].readinessProbe.httpGet.port: Invalid value: "3000": must be an IANA_SVC_NAME (at most 15 characters, matching regex [a-z0-9]([a-z0-9-]*[a-z0-9])*”

error: Service "test" is invalid: spec.ports[0].targetPort: Invalid value: "800": must be an IANA_SVC_NAME (at most 15 characters, matching regex [a-z0-9]([a-z0-9-]*[a-z0-9])*, it must contain at least one letter [a-z], and hyphens cannot be adjacent to other hyphens): e.g. "http"


Version-Release number of selected component (if applicable):
OCP 3.1+
OCP 3.3

How reproducible:
100%

Steps to Reproduce:
1. Create template 

$ cat bug1.yaml 

  kind: "Template"
  apiVersion: "v1"
  metadata:
    name: "bug1"
    creationTimestamp: null
    annotations:
      description: "Template for container creation"
      iconClass: "icon-generic"
      tags: "generic"
  objects:
    -
      kind: "Service"
      apiVersion: "v1"
      metadata:
        name: "${NODE_TEMPLATE_NAME}"
      spec:
        ports:
          - name: "web"
            protocol: '${PROTOCOL}'
            port: '${EXT_PORT}'
            targetPort: '${CONTAINER_PORT}'
        selector:
          name: "${NODE_TEMPLATE_NAME}"
        type: "ClusterIP"
        sessionAffinity: "None"
  parameters:
    - name: "PROTOCOL"
      description: "protocol application uses"
    - name: "CONTAINER_PORT"
      description: "Container port number"
    - name: "EXT_PORT"
      description: "external port to be exposed"
    - name: "NODE_TEMPLATE_NAME"
      description: "Template name"


2. $ oc create -f bug1
3. $  oc process bug1 -v PROTOCOL=UDP,CONTAINER_PORT=888,EXT_PORT=999,NODE_TEMPLATE_NAME=bug-param | oc create -f -

Actual results:

ERROR:
The Service "bug-param" is invalid.
spec.ports[0].targetPort: Invalid value: "888": must be an IANA_SVC_NAME (at most 15 characters, matching regex [a-z0-9]([a-z0-9-]*[a-z0-9])*, it must contain at least one letter [a-z], and hyphens cannot be adjacent to other hyphens): e.g. "http"


Expected results:

Create the service. 


Additional info:

https://stackoverflow.com/questions/39281444/how-to-parameterize-ports-in-openshift-json-project-template


https://github.com/kubernetes/kubernetes/blob/release-1.3/pkg/api/types.go#L1790
https://github.com/kubernetes/kubernetes/blob/release-1.3/pkg/api/types.go#L883

This proposal would resolve this i think.
https://github.com/kubernetes/kubernetes/blob/master/docs/proposals/templates.md