docker build command builds an image from a Dockerfile.
The docker build command builds Docker images from a Dockerfile and a “context”. A build’s context is nothing but the set of files and folders specified in the PATH or URL.
docker build [OPTIONS] PATH | URL | -
To use the docker build command below are the steps:
1. Create Dockerfile
2. Use docker build command to create the image
#This is a sample Image FROM ubuntu MAINTAINER firstname.lastname@example.org RUN apt-get update RUN apt-get install curl wget RUN apt-get install -y nginx CMD ["echo","Image created successfully"]
Build the image from above Dockerfile
docker build -t my-ubuntu .
This example specifies that the PATH is “.” and so all the files in the local directory get tard and sent to the Docker daemon.