Kubernetes 101 : Switching namespaces, the default namespace and contexts
Kubernetes uses namespaces to separate objects. For example different departments will have different applications running in different namespaces.
If we don't specify a namespace while issuing a command like "kubectl get pods" for example, the command executes in the default namespace, and it will only display the blue pods.
If we want our commands to run in a different namespace, we have to explicitly mention it as below for example:
Kubernetes contexts:
If we want to change the default namespace, we would need to use another kubernetes object called "context".
The information for the context lives in the following directory "$HOME/.kube/config".
"$HOME" is the home directory.
We could change the default namespace using the below command:
Then we would need to use the below command to apply our changes using the below command:
Setting the namespace:
You can permanently set the namespace for all subsequent "kubectl" commands using the below command:
Kubernetes objects and namespaces:
Some Kubernetes resources live in namespaces, like for example - pods, services, ...
Other resource like the kubernetes cluster nodes for example are cluster-wide resources.
To display the "namespaced" resources, we use the below command:
To display the "non-namespaced" resources, we use the below command:
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