Building a Docker image

Building a Docker image is performed using the docker build command. You have two options when it comes to performing this step:

• Use Visual Studio Code's Command Palette.
• Use the Powershell command line.

In Visual Studio Code, do the following:

1. Use the Ctrl + Shift + P shortcut in order to open the Command Palette.
2. Search for Docker: Build Image and execute it by providing the image name and tag in the following format (or use the default suggested name based on the directory name):

<image name>:<tag>

3. If you are logged into a custom registry or using Docker Hub, you can also specify the following:

<registry or username>/<image name>:<tag>

We will use the following image name and tag in this example: docker-helloworld-iis:latest.

The Visual Studio Code command is equivalent to performing the following actions in Powershell:

1. Change the working directory to the folder that contains the Dockerfile; for example:

cd c:\src\Hands-On-Kubernetes-on-Windows\Chapter01\docker-helloworld-iis

2. Execute the docker build command while specifying the -t argument in order to provide the image name and tag and use the current directory, ., as the build context:

docker build -t docker-helloworld-iis:latest .

The following screenshot shows the output of the preceding command:

After a successful build, you can use the docker-helloworld-iis local image to create new containers. We will cover this in the next subsection.