Error | 404 エラー | 404

The docker build command uses the Dockerfile to build a new image. You might have noticed that Docker downloaded a lot of "layers". This is because you instructed the builder that you wanted to start from the node:lts-alpine image. But, since you didn't have that on your machine, Docker needed to download the image. After Docker downloaded the image, the instructions from the Dockerfile copied in your application and used yarn to install your application's dependencies. The CMD directive specifies the default command to run when starting a container from this image. Finally, the -t flag tags your image. Think of this as a human-readable name for the final image. Since you named the image getting-started, you can refer to that image when you run a container. The . at the end of the docker build command tells Docker that it should look for the Dockerfile in the current directory.