Namespace resolution

Finding an application namespace happens on a best-effort basis. There are some steps that we iterate in order to find it. The easiest and most common one, is to specify it in the proper configuration, for example:

spring:
  application:
    name: app
  cloud:
    kubernetes:
      secrets:
        name: secret
        namespace: default
        sources:
         # Spring Cloud Kubernetes looks up a Secret named 'a' in namespace 'default'
         - name: a
         # Spring Cloud Kubernetes looks up a Secret named 'secret' in namespace 'b'
         - namespace: b
         # Spring Cloud Kubernetes looks up a Secret named 'd' in namespace 'c'
         - namespace: c
           name: d

Remember that the same can be done for config maps. If such a namespace is not specified, it will be read (in this order):

from property spring.cloud.kubernetes.client.namespace
from a String residing in a file denoted by spring.cloud.kubernetes.client.serviceAccountNamespacePath property
from a String residing in /var/run/secrets/kubernetes.io/serviceaccount/namespace file (kubernetes default namespace path)
from a designated client method call (for example fabric8’s : KubernetesClient::getNamespace), if the client provides such a method. This, in turn, could be configured via environment properties. For example fabric8 client can be configured via "KUBERNETES_NAMESPACE" property; consult the client documentation for exact details.

Failure to find a namespace from the above steps will result in an Exception being raised.