But it is an efficient approach to combine all the RUN instructions into a single one.Įach RUN command creates a new cache layer or an intermediate image layer and hence chaining all of them into a single line, becomes efficient. You can use several RUN instructions to run different commands. You can also push your own customized base image inside the docker registry.Įxamples of FROM instruction along with different base images are − FROM ubuntuĪ RUN instruction is used to run specified commands. There are several pre published docker base images available in the docker registry. If you already have the base image pulled previously in your local machine, it doesn’t pull a new one. It contains an image name and an optional tag name. All the instructions executed after this command take place on this base image. The FROM command is of the form − FROM :Ī FROM command allows you to create a base image such as an operating system, a programming language, etc. You must have noticed that almost all the dockerfile starts with the FROM command. ![]() Without any further ado, let’s discuss some of the most important dockerfile commands that you should thoroughly be aware of in order to efficiently create a dockerfile. In a separate article, I have also enlisted best practices to create a dockerfile. In this article, I have created a curated list of all the important commands and instructions that are extensively used in a dockerfile. ![]() Hence, it becomes very important to create an efficient, reusable, clean dockerfile as it contains the blueprint of the image that you will build. It contains certain instructions and commands that decides the structure of your image, the amount of time taken to build the image, contains instructions related to docker build context, contains information related to the packages and libraries to be installed in the container and many more. A dockerfile contains a set of instructions that are executed step by step when you use the docker build command to build the docker image. We all know the importance of dockerfile in creating an efficient and flexible Docker Image.
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