Create deployments with kubectl version 1.18 +

Question

At page 67 of Kubernetes: Up and Running, 2nd Edition, the author uses the command below in order to create a Deployment:

kubectl run alpaca-prod \
--image=gcr.io/kuar-demo/kuard-amd64:blue \
--replicas=2 \
--labels="ver=1,app=alpaca,env=prod"

However this command is deprecated with kubectl 1.19+, and it now creates a pod:

$ kubectl run alpaca-prod \     
--image=gcr.io/kuar-demo/kuard-amd64:blue \
--replicas=2 \
--labels="ver=1,app=alpaca,env=prod"
Flag --replicas has been deprecated, has no effect and will be removed in the future.
pod/alpaca-prod created

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.0", GitCommit:"e19964183377d0ec2052d1f1fa930c4d7575bd50", GitTreeState:"clean", BuildDate:"2020-08-26T14:30:33Z", GoVersion:"go1.15", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.2", GitCommit:"faecb196815e248d3ecfb03c680a4507229c2a56", GitTreeState:"clean", BuildDate:"2021-01-21T01:11:42Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}

Is there a way to use kubectl run to create a deployment with replicas and custom label with kubectl 1.19+?

Answer 1

It is now preferred to use kubectl create to create a new Deployment, instead of kubectl run.

This is the corresponsing command to your kubectl run

kubectl create deployment alpaca-prod --image=gcr.io/kuar-demo/kuard-amd64:blue --replicas=2

Labels

By default from kubectl create deployment alpaca-proc you will get the label app=alpaca.

The get the other labels, you need to add them later. Use kubectl label to add labels to the Deployment, e.g.

kubectl label deployment alpaca-prod ver=1

Note: this only adds the label to the Deployment and not to the Pod-template, e.g. the Pods will not get the label. To also add the label to the pods, you need to edit the template: part of the Deployment-yaml.