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Namespace

Table of Contents

Namespaces are used for encapsulate a group of resources check details. https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/

Provide a new namespace "training"

kubectl create namespace training
check the namespaces
kubectl get ns
NAME                 STATUS   AGE
default              Active   15h
demo                 Active   15h
ingress-nginx        Active   15h
kube-node-lease      Active   15h
kube-public          Active   15h
kube-system          Active   15h
local-path-storage   Active   15h
training             Active   5s

Scoping the kubectl command

You want to target your own namespace instead of default one every time you use kubectl. You can run a command in a specific namespace by using the -n, --namespace=''-flag.

The below commands do the same thing, because kubernetes commands will default to the default namespace:

kubectl get pods -n default
kubectl get pods
To execute a kubectl command above all namespaces you can use -A
kubectl get pods -A

NAMESPACE            NAME                                                   READY   STATUS    RESTARTS   AGE
demo                 helloweb-67dffcd76f-2hkt4                              1/1     Running   0          175m
ingress-nginx        ingress-nginx-controller-5dff8dcf67-kvx7q              1/1     Running   0          176m
kube-system          coredns-6d4b75cb6d-fc9ww                               1/1     Running   0          177m
kube-system          coredns-6d4b75cb6d-nhvlz                               1/1     Running   0          177m
kube-system          etcd-k8s-playground-control-plane                      1/1     Running   0          177m
kube-system          kindnet-wxxzr                                          1/1     Running   0          177m
kube-system          kube-apiserver-k8s-playground-control-plane            1/1     Running   0          177m
kube-system          kube-controller-manager-k8s-playground-control-plane   1/1     Running   0          177m
kube-system          kube-proxy-7kk4c                                       1/1     Running   0          177m
kube-system          kube-scheduler-k8s-playground-control-plane            1/1     Running   0          177m
kube-system          metrics-server-555c8cbc74-bjr9d                        1/1     Running   0          177m
local-path-storage   local-path-provisioner-9cd9bd544-7mdhc                 1/1     Running   0          177m