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Namespaces¶

Kubernetes supports multiple virtual clusters backed by the same physical cluster.
These virtual clusters are called namespaces.
Namespaces are the default way for Kubernetes to separate resources.
Using namespaces we can isolate the development, improve security and much more.
Kubernetes clusters has a builtin namespace called default and might contain more namespaces, like kube-system, for example.

01. Create Namespace¶

# In this sample `codewizard` is the desired namespace
$ kubectl create namespace codewizard
namespace/codewizard created

### !!! Try to create the following namespace (with _ & -), and see what happens:
$ kubectl create namespace my_namespace-

02. Setting the default Namespace for `kubectl`¶

To set the default namespace run:

$ kubectl config set-context $(kubectl config current-context) --namespace=codewizard

Context minikube modified.

03. Verify that you’ve updated the namespace¶

$ kubectl config get-contexts
CURRENT     NAME                 CLUSTER          AUTHINFO         NAMESPACE
            docker-desktop       docker-desktop   docker-desktop
            docker-for-desktop   docker-desktop   docker-desktop
*           minikube             minikube         minikube         codewizard

0.4 Using the `-n` Flag:¶

When using kubectl you can pass the -n flag in order to execute the kubectl command on a desired namespace.
For example:

# get resources of a specific workspace
$ kubectl get pods -n <namespace>