Dockerfile Best Practices
In the previous section, we discussed how we can build an efficient Docker image with multi-stage Dockerfiles
. In this section, we will cover other recommended best practices for writing Dockerfiles
. These best practices will ensure reduced build time, reduced image size, increased security, and increased maintainability of the Docker images produced.
Using an Appropriate Parent Image
Using the appropriate base image is one of the key recommendations when building efficient Docker images.
It is always encouraged to use official images from the Docker Hub as the parent image when you are building custom Docker images. These official images will ensure that all best practices are followed, documentation is available, and security patches are applied. For example, if you need the JDK (Java Development Kit) for your application, you can use the openjdk
official Docker image instead of using the generic ubuntu
image and installing the JDK on top of...