Creating a New Dockerfile for Maven
#Using offical maven image as a parent image FROM maven:3.5-jdk-8-alpine as build #Setting the working directory to /app WORKDIR /app #Copy the current directory contents into the container at current directory COPY . . #Install the mvn command for maven RUN mvn install
By using the above Dockerfile we can build an image of Maven we are setting a Maven alpine image as a base image with the help of FROM command and with the help of WORKDIR setting the working directory for Maven and copy the required files and folders to maven we are using the COPY command and RUN command can download the required commands in the image we are downloading mvn command.
Note: # is used for comments in Dockerfile.
What is Dockerfile Syntax?
Pre-requsites: Docker,Dockerfile
A Dockerfile is a script that uses the Docker platform to generate containers automatically. It is essentially a text document that contains all the instructions that a user may use to create an image from the command line. The Docker platform is a Linux-based platform that allows developers to create and execute containers, self-contained programs, and systems that are independent of the underlying infrastructure. Docker, which is based on the Linux kernel’s resource isolation capabilities, allows developers and system administrators to transfer programs across multiple systems and machines by executing them within containers.
Docker containers may operate on any Linux host thanks to Dockerfiles. Docker images are used to construct container environments for applications, and they may be produced manually or automatically using Dockerfiles. Docker containers can execute Linux and Windows apps. Developers may use Dockerfiles to construct an automated container build that steps through a series of command-line instructions. Docker containerization is essentially virtualization at the operating system level. Without the startup overhead of virtual machines, several independent containers can run within a single Linux instance.
Dockerfiles provide business applications with more flexibility and mobility. Dockerfiles are used by IT companies to bundle programs and their dependencies in a virtual container that may operate on bare metal, in public or private clouds, or on-premises. Numerous apps, worker tasks, and other activities can operate independently on a single physical computer or across multiple virtual machines using containers. Kubernetes is an open-source solution for automating the management and orchestration of Dockerfile-based containerized applications.