Deploying Dockerfile on Kubernetes Engine

C.

Reference - https://cloud.google.com/kubernetes-engine/docs/tutorials/hello-app.

Sure, I'd be happy to explain!

When deploying a Dockerfile on Kubernetes Engine, the recommended approach is to create a Docker image from the Dockerfile and upload it to Google Cloud's Container Registry. Then, a Deployment YAML file can be created to point to that image. Finally, the kubectl command can be used to create the deployment with that YAML file.

Here's a step-by-step breakdown of the process:

1. Build the Docker image from the Dockerfile: This can be done using the docker build command, which reads the instructions in the Dockerfile and generates an image based on those instructions. The resulting image can then be tagged with a name and version number using the docker tag command.

2. Upload the Docker image to Container Registry: Google Cloud's Container Registry is a private Docker image registry that allows you to store, manage, and secure Docker images. The gcloud command-line tool can be used to push the Docker image to Container Registry, like this:

   pythonCopy code
   gcloud auth configure-docker # enable docker to authenticate to Container Registry docker push gcr.io/<project-id>/<image-name>:<version-tag> # push the image to Container Registry 

   Note: Replace <project-id> with your Google Cloud project ID, <image-name> with the name you want to give your image, and <version-tag> with the version number you assigned earlier.

3. Create a Deployment YAML file: A Deployment YAML file is used to specify how many instances of the Docker image should be running, what ports should be exposed, and other configuration options. Here's an example YAML file that deploys the Docker image we just uploaded:

   yamlCopy code
   apiVersion: apps/v1 kind: Deployment metadata:   name: my-app spec:   replicas: 3   selector:     matchLabels:       app: my-app   template:     metadata:       labels:         app: my-app     spec:       containers:       - name: my-app         image: gcr.io/<project-id>/<image-name>:<version-tag>         ports:         - containerPort: 80 

   This YAML file specifies that we want to run three replicas of the Docker image, and that we want to expose port 80. Replace <project-id>, <image-name>, and <version-tag> with the values you used earlier.

4. Use kubectl to create the deployment: Finally, we can use the kubectl command to create the deployment based on the YAML file we just created:

   phpCopy code
   kubectl apply -f <deployment-file>.yaml 

   Replace <deployment-file> with the name of the YAML file you just created.

So the correct answer to the question is C. I hope that helps!