How to Create A Base Image Using Scratch? A Step-By-Step Guide
Step 1: Prepare Your files
- Firstly prepare the files or binaries that you want to include in the creating minimal Ubuntu Image. Here the files should be essential binaries or configurations.
Step 2: Create A Root File System
- Setup a minimal root file system for Ubuntu. It typically involves creating directories such as /bin , /etc and /usr and populate them essential files and directories.
Step 3: Download Ubuntu Base Packages
- Now, try to download the base packages for Ubuntu. Here you will need to fetch the essential packages that are required for a minimal Ubuntu system. These essential packages includes libc , coreutils, apt , bash and other essential utilities.
Step 4: Install Essential Packages
- Extract the downloaded base packages into your root file system and try to configure them as necessary. Ensure that essential packages are properly installed and configured for providing a functional ubuntu environment.
Step 5: Create A Dockerfile
- Now, create a file with name “Dockerfile” in your project working directory and define the instructions in that file for building the ubuntu base image from scratch from your custom root file system. The dockerfile looks as follows:
# Use Scratch as the base image
FROM scratch
# Copy the custom root file system into the image
COPY ./rootfs /
# Set the entry point
ENTRYPOINT ["/bin/bash"]
Step 6: Build The Docker Image
- On using the following command build the docker image from the Dockerfile.
docker build -t myubuntuimage .
Step 7: Verify The Docker Image
- After the successful build, verify the docker image with executing the following command:
docker images
How to Create Docker Image?
Docker is a powerful containerization tool that enables developers to package their applications and their dependencies into a single unit called Docker image. The Docker image offers seamless deployment, scalability, and portability. In this article, I will make sure that you understand what is docker and guide you through the steps to create a Docker image.
Table of Content
- What is Docker?
- What is Docker Image?
- Why Create Docker Images?
- How to Create Docker Image With Dockerfile: A Step-By-Step Guide
- How to Create A Base Image Using Scratch? A Step-By-Step Guide
- How to Create a Full Image Using tar?
- How to Optimize Your Docker Image Size?
- How to Host Your Docker Image?
- Examples of Docker Commands for Creating a Dockerfile
- Dockerfile vs Docker Image Vs Container
- Docker Image Commands
- Key Commands of Docker Image And Docker Container
- Examples of Docker Image UseCases
- How To Create A Docker Image On Docker Desktop: A Step-By-Step Guide
- How to Create a Docker Image from Docker Container? A Step-By-Step Guide
- Conclusion
- Create Docker Image – FAQs