dockerfile

A dockerfile can be used to build an image and then run as a container on docker terms or as a pod in Kubernetes.

A Dockerfile is a text file that contains a series of instructions on how to build a Docker image. It’s like a recipe that tells Docker how to set up an environment for your application. Here’s a breakdown of what it typically includes:

Base Image: Specifies the starting point, usually an existing image like ubuntu or node.
Commands: Instructions to install software, copy files, set environment variables, and configure settings.
Entry Point: Defines the command to run when the container starts.

# Arguments supported in a Dockerfile

The Dockerfile supports the following instructions:

Instruction	Description
`ADD`	Add local or remote files and directories.
`ARG`	Use build-time variables.
`CMD`	Specify default commands.
`COPY`	Copy files and directories.
`ENTRYPOINT`	Specify default executable.
`ENV`	Set environment variables.
`EXPOSE`	Describe which ports your application is listening on.
`FROM`	Create a new build stage from a base image.
`HEALTHCHECK`	Check a container’s health on startup.
`LABEL`	Add metadata to an image.
`MAINTAINER`	Specify the author of an image.
`ONBUILD`	Specify instructions for when the image is used in a build.
`RUN`	Execute build commands.
`SHELL`	Set the default shell of an image.
`STOPSIGNAL`	Specify the system call signal for exiting a container.
`USER`	Set user and group ID.
`VOLUME`	Create volume mounts.
`WORKDIR`	Change working directory.

More on the Docker Docs on Dockerfile reference.

# Simple Example with nginx

Example with nginx.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11


# Use the official NGINX image from Docker Hub
FROM nginx:latest

# Copy your custom NGINX configuration file (if you have one)
# COPY nginx.conf /etc/nginx/nginx.conf

# Copy static website files to the appropriate directory
# COPY . /usr/share/nginx/html

# Expose the port NGINX listens on
EXPOSE 80

# Docker Commands

Docker Commands.

# Run from a local DockerFile

Step-by-Step Process

Build an image from your Dockerfile:

1

docker build -t test .

Run a container from that image:

1

bashdocker run -d --name my-container test

or in one go:

1

docker build -t test . && docker run -d --name my-container test

Simple Docker Setup

Check my quick GitHub repo setup that can be cloned and used: simple-docker-setup: Local docker setup to test repository or code from a fresh state for data engineering.

Origin:

dockerfile

# Arguments supported in a Dockerfile

# Simple Example with nginx

# Docker Commands

# Run from a local DockerFile

Interactive Graph

Backlinks