mirror of https://github.com/docker/docs.git
148 lines
4.4 KiB
Markdown
148 lines
4.4 KiB
Markdown
---
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title: Test your R deployment
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linkTitle: Test your deployment
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weight: 50
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keywords: deploy, kubernetes, R
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description: Learn how to develop locally using Kubernetes
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aliases:
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- /language/r/deploy/
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- /guides/language/r/deploy/
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---
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## Prerequisites
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- Complete all the previous sections of this guide, starting with [Containerize a R application](containerize.md).
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- [Turn on Kubernetes](/manuals/desktop/features/kubernetes.md#install-and-turn-on-kubernetes) in Docker Desktop.
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## Overview
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In this section, you'll learn how to use Docker Desktop to deploy your application to a fully-featured Kubernetes environment on your development machine. This allows you to test and debug your workloads on Kubernetes locally before deploying.
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## Create a Kubernetes YAML file
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In your `r-docker-dev` directory, create a file named
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`docker-r-kubernetes.yaml`. Open the file in an IDE or text editor and add
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the following contents. Replace `DOCKER_USERNAME/REPO_NAME` with your Docker
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username and the name of the repository that you created in [Configure CI/CD for
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your R application](configure-ci-cd.md).
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: docker-r-demo
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namespace: default
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spec:
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replicas: 1
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selector:
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matchLabels:
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service: shiny
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template:
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metadata:
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labels:
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service: shiny
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spec:
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containers:
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- name: shiny-service
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image: DOCKER_USERNAME/REPO_NAME
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imagePullPolicy: Always
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env:
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- name: POSTGRES_PASSWORD
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value: mysecretpassword
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: service-entrypoint
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namespace: default
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spec:
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type: NodePort
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selector:
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service: shiny
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ports:
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- port: 3838
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targetPort: 3838
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nodePort: 30001
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```
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In this Kubernetes YAML file, there are two objects, separated by the `---`:
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- A Deployment, describing a scalable group of identical pods. In this case,
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you'll get just one replica, or copy of your pod. That pod, which is
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described under `template`, has just one container in it. The
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container is created from the image built by GitHub Actions in [Configure CI/CD for
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your R application](configure-ci-cd.md).
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- A NodePort service, which will route traffic from port 30001 on your host to
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port 3838 inside the pods it routes to, allowing you to reach your app
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from the network.
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To learn more about Kubernetes objects, see the [Kubernetes documentation](https://kubernetes.io/docs/home/).
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## Deploy and check your application
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1. In a terminal, navigate to `r-docker-dev` and deploy your application to
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Kubernetes.
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```console
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$ kubectl apply -f docker-r-kubernetes.yaml
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```
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You should see output that looks like the following, indicating your Kubernetes objects were created successfully.
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```text
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deployment.apps/docker-r-demo created
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service/service-entrypoint created
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```
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2. Make sure everything worked by listing your deployments.
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```console
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$ kubectl get deployments
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```
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Your deployment should be listed as follows:
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```shell
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NAME READY UP-TO-DATE AVAILABLE AGE
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docker-r-demo 1/1 1 1 15s
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```
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This indicates all one of the pods you asked for in your YAML are up and running. Do the same check for your services.
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```console
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$ kubectl get services
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```
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You should get output like the following.
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```shell
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h
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service-entrypoint NodePort 10.99.128.230 <none> 3838:30001/TCP 75s
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```
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In addition to the default `kubernetes` service, you can see your `service-entrypoint` service, accepting traffic on port 30001/TCP.
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3. In a browser, visit the following address. Note that a database was not deployed in
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this example.
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```console
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http://localhost:30001/
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```
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4. Run the following command to tear down your application.
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```console
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$ kubectl delete -f docker-r-kubernetes.yaml
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```
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## Summary
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In this section, you learned how to use Docker Desktop to deploy your application to a fully-featured Kubernetes environment on your development machine.
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Related information:
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- [Kubernetes documentation](https://kubernetes.io/docs/home/)
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- [Deploy on Kubernetes with Docker Desktop](/manuals/desktop/features/kubernetes.md)
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- [Swarm mode overview](/manuals/engine/swarm/_index.md)
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