Since the process only transfers the necessary components of the artifact, you don’t have to clean up manually after every instruction. The required artifact passes to the following stage, leaving behind content that you won’t need in the final image artifact. It allows users to divide the Dockerfile into multiple stages.Įach stage begins with a FROM instruction. Utilize the Multi-Stage Builds Feature in Dockerĭocker introduced the multi-stage feature in its 17.05 version. That way, you remove any irrelevant content from the built context. The system checks whether there is such a file and applies its exceptions and ignore rules. This Docker feature is initiated with docker run. dockerignore file and store it in the same folder as the Dockerfile. When outlining the build context, it is important also to include a.

When building an image, you write a Dockerfile with specifications of what that image should look like. dockerignore FileĮxcluding certain files that aren’t necessary for your image can help you reduce the image size. The most downloaded OS image, Ubuntu, is 188 MB, while Alpine is only 5 MB. This Linux distribution image base is only 5 MB, built around musl libc and BusyBox.Ĭompared to other OS images, Alpine is much smaller in size. Linux created a helpful alternative that is lightweight and has a minimal POSIX environment – Alpine. The OS base can drastically impact the size of your final Docker image, which is why deciding on the right one plays a significant role.

You install a variation of an operating system as the base of an image. You can download an existing parent image and use it as the base of your own image or build one from scratch. To create a Docker image, you need a base on which you can install and add components, as needed.

Docker virtualbox increase disk size