Kubernetes client-python creating a service error - python-3.x

Question

I am trying to create a new service for one of my deployments named node-js-deployment in GCE hostes Kubernetes Cluster
I followed the Documentation to create_namespaced_service
This is the service data:
{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "node-js-service"
},
"spec": {
"selector": {
"app": "node-js"
},
"ports": [
{
"protocol": "TCP",
"port": 80,
"targetPort": 8000
}
]
}
}
This is the Python function to create the service
api_instance = kubernetes.client.CoreV1Api()
namespace = 'default'
body = kubernetes.client.V1Service() # V1Serice
# Creating Meta Data
metadata = kubernetes.client.V1ObjectMeta()
metadata.name = "node-js-service"
# Creating spec
spec = kubernetes.client.V1ServiceSpec()
# Creating Port object
ports = kubernetes.client.V1ServicePort()
ports.protocol = 'TCP'
ports.target_port = 8000
ports.port = 80
spec.ports = ports
spec.selector = {"app": "node-js"}
body.spec = spec
try:
api_response = api_instance.create_namespaced_service(namespace, body, pretty=pretty)
pprint(api_response)
except ApiException as e:
print("Exception when calling CoreV1Api->create_namespaced_service: %s\n" % e)
Error:
Reason: Bad Request
HTTP response headers: HTTPHeaderDict({'Content-Type': 'application/json', 'Date': 'Tue, 21 Feb 2017 03:54:55 GMT', 'Content-Length': '227'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Service in version \"v1\" cannot be handled as a Service: only encoded map or array can be decoded into a struct","reason":"BadRequest","code":400}
But the service is being created if I am passing JSON. Not sure what I am doing wrong.
Any help is greatly appreciated, thank you.

Answer 1

From reading your code, it seems that you miss assigning the metadata to body.metadata. And you missed that the ports field of the V1ServiceSpec is supposed to be a list, but you used a single V1ServicePort so without testing I assume this should works:
api_instance = kubernetes.client.CoreV1Api()
namespace = 'default'
body = kubernetes.client.V1Service() # V1Serice
# Creating Meta Data
metadata = kubernetes.client.V1ObjectMeta()
metadata.name = "node-js-service"
body.metadata = metadata
# Creating spec
spec = kubernetes.client.V1ServiceSpec()
# Creating Port object
port = kubernetes.client.V1ServicePort()
port.protocol = 'TCP'
port.target_port = 8000
port.port = 80
spec.ports = [ port ]
spec.selector = {"app": "node-js"}
body.spec = spec
The definition could also be loaded from json / yaml directly as shown in two of the examples within the offical repo - see exec.py create_deployment.py.
Your solution could then look like:
api_instance = kubernetes.client.CoreV1Api()
namespace = 'default'
manifest = {
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "node-js-service"
},
"spec": {
"selector": {
"app": "node-js"
},
"ports": [
{
"protocol": "TCP",
"port": 80,
"targetPort": 8000
}
]
}
}
try:
api_response = api_instance.create_namespaced_service(namespace, manifest, pretty='true')
pprint(api_response)
except ApiException as e:
print("Exception when calling CoreV1Api->create_namespaced_endpoints: %s\n" % e)