How to pass namespace in Kubernetes create deployment command - kubernetes

Question

I am trying to define the namespace name when executing the kubectl create deployment command?
This is what I tried:
kubectl create deployment test --image=banu/image1 namespace=test
and this doesn't work.
And I want to expose this deployment using a ClusterIP service within the cluster itself for that given namespace How can I do that using kubectl command line?

Answer 1

You can specify either -n or --namespace options.
kubectl create deployment test --image=nginx --namespace default --dry-run -o yaml and see result deployment yaml.
Using kubectl run
kubectl run test --namespace test --image nginx --port 9090 --dry-run -o yaml

Answer 2

You need to create a namespace like this
kubectl create ns test
ns stands for namespace, so with kubectl you say you want to create namespace with name test
Then while you creating the deployment you add the namespace you want
kubectl create deployment test --image=banu/image1 -n test
Where flag -n stands for namespace, that way you say to Kubernetes that all resources related to that deployment will be under the test namespace
In order to see all the resources under a specific namespace
kubectl get all -n test
--namespace and -n is the same things

Answer 3

Use -n test instead of namespace=test
Sample with nginx image:
$ kubectl create deployment nginx --image=nginx -n test
deployment.apps/nginx created
$ kubectl get deploy -n test
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 1/1 1 1 8s
In second case you need to create service and define labels from deployment.
You can find correct labels by runnig something like:
kubectl -n test describe deploy test |grep Labels:
and apply service like:
apiVersion: v1
kind: Service
metadata:
name: test-svc
namespace: test
spec:
ports:
- name: test
port: 80 # Change this port
protocol: TCP
type: ClusterIP
selector:
# Here you need to define output from previous step