A namespace is a virtual cluster in our Kubernetes cluster. We can configure a namespace to have a resource quota, such as the maximum number of pods. This can be done by creating a ResourceQuota object and setting the namespace property in metadata to the name of the namespace.
apiVersion: v1
kind: ResourceQuota
metadata:
name: name-of-quota
namespace: name-of-namespace
When one creates a Service in a namespace, it creates a DNS entry in a specific format (below). svc refers to Service, while cluster.local is the default domain name of the Kubernetes cluster.
<name-of-service>.<name-of-namespace>.svc.cluster.local
A Kubernetes object in a namespace can access a Service in the same namespace just by referring the name of the Service, but to access a Service in another namespace, we must refer the entire DNS entry.