Dockerfileihin

Dockerfileihin refers to Dockerfiles within the Docker ecosystem, i.e., the collection of text-based scripts used to define how a Docker image is built. A Dockerfile is read by the Docker daemon by running docker build, producing a standalone image that can be run as a container. Each instruction in a Dockerfile contributes a new layer to the image, enabling caching and incremental builds.

Common instructions include FROM to designate a base image; RUN to execute commands; COPY and ADD to bring files into the image; CMD and ENTRYPOINT to specify the default process to run; WORKDIR to set the working directory; ENV and ARG to define variables; LABEL for metadata; EXPOSE to document listening ports; VOLUME to declare mount points; USER to run commands as a non-root user; HEALTHCHECK to monitor runtime status; and SHELL to customize the shell.

Workflow and practices: A Dockerfile is typically placed in a project’s root alongside source code; a .dockerignore file can exclude files from the build context. Builds are performed with docker build, which can produce tagged images. The caching mechanism reuses unchanged layers, speeding iterative development. Multi-stage builds help minimize final image size by using separate stages for building artifacts and delivering only the runtime artifacts. Best practices include pinning base image versions, minimizing the number of layers, using COPY instead of ADD for predictable file handling, avoiding secret data in images, and running as a non-privileged user.

See also: Docker, Docker images, Docker Compose, Dockerfile syntax reference.