A Kubernetes namespace can be seen as a kind of label that allows you to group and isolate components of your Kubernetes cluster, such as pods and services. This is particularly useful when running multiple use cases on a single Kubernetes cluster and you want to clearly group them to avoid confusion.
Here are the key commands for working with namespaces:
- Instead of 'ns', you can also use 'namespace' or 'namespaces'.
- Instead of '-n', you can also use '--namespace'.
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To create a namespace, use the following command:
kubectl create ns <name> -
To get an overview of your namespaces, use the following command:
kubectl get nsYou will see some default namespaces: default, kube-node-lease, kube-public, kube-system. You can safely ignore these default namespaces. Interested readers can find more information on what these namespaces are used for here.
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To delete a namespace and all its associated resources, use the following command:
kubectl delete ns <namespace-name> -
You can assign Kubernetes resources, or objects/Helm Charts that you deploy to a namespace using the '-n <namespace-name>' flag. For example, when installing a Helm Chart:
helm install -f <filename>.yaml <release-name> <repository>/<helm-chart> -n <namespace-name>The '-n <namespace-name>' flag (e.g., '-n traefik') assigns the Helm installation to the specified namespace. Then, you can view the deployed pods within this namespace using the command:
kubectl get pods -n <namespace-name>