Namespace - Sandeep-K-Khandelwal/CKAD GitHub Wiki

• Namespaces are used to isolate resources in the Kubernetes cluster
• Kubernetes create a default namespace as part of the cluster setup
• Kubernetes create resources in the current namespace if not specified
• Kubernetes resources can be created in another namespace by using --namespace=<namespace_name> option in the command line
• A new namespace can be created using the following command - kubectl create namespace <namespace_name>
• The YML to create the namespace is as follows -

apiVersion: v1
kind: Namespace
metadata:
  name: dev

• We can switch the namespace using the following command - kubectl config set-context $(kubectl config current-context) --namespace=<namespace_name>
• Use --all-namespaces to get the information from all namespaces
• The DNS to access the service from another namespace - db-service.marketing.svc.cluster.local. Here db-service is the service name, marketing is the namespace name, svc is the subdomain for the services and cluster.local is the default cluster