K
Q

Kubernetes ExternalName Services

January 23, 2019

I have created a Kubernetes Service with type ExternalName, I understand this service act as a proxy and redirect the request to the external service sitting outside the cluster. I am able to create the service but not able to curl it i.e I get 500 error. I wanna understand how this ExternalName Kubernetes service work.

-- Kunal Malhotra
kubernetes

1 Answer

January 23, 2019

Services with type 

ExternalName
work as other regular services, but when you want to access to that service name, instead of returning cluster-ip of this service, it returns CNAME record with value that mentioned in 
externalName:
parameter of service.

As example mentioned in Kubernetes Documentation:

kind: Service

apiVersion: v1

metadata:

  name: my-service

spec:

  type: ExternalName

  externalName: my.database.example.com

When you want to do 

curl -v http://my-service
or 
curl -v http://my-service.default.svc.cluster.local
according your namespace(in this example it is default), it will redirect you at the DNS level to 
http://my.database.example.com

I hope it was useful

-- clxoid
Source: StackOverflow