It used yum repo for installation of packages. This will call the create users file and then reload the Tomcat server.Centos 7 is a linux distribustion. RUN echo 'deb trusty main' > /etc/apt/sources.list & \ echo 'deb-src trusty main' > /etc/apt/sources.list & \Īpt-key adv -keyserver -recv-keys C2518248EEA14886 & \Īpt-get update & \ echo oracle-java $ " echo "" echo "="Īdd one more file in the same directory named as run.sh with following content. RUN DEBIAN_FRONTEND =noninteractive apt-get install -y -q python-software-properties software-properties-common RUN echo "deb trusty main universe" > /etc/apt/sources.list To begin this process, create a new folder and then create a file in it named “Dockerfile” with the following content. Let’s create a Dockerfile for the Oracle JDK, which is not available on Docker Hub. It is not necessary to write a Dockerfile for OpenJDK in order to run a simple Java application, because you can obtain the official image of OpenJDK from the Docker Hub repository.
Writing a Dockerfile for a simple Java application This can be overridden upon executing the docker run command.ĪDD - This instruction copies the new files, directories into the Docker container file system at specified destination.ĮXPOSE - This instruction exposes specified port to the host machine. For this post, JAVA_HOME is the variable that is set.ĬMD - Provides the facility to run commands at the start of container. RUN - Runs any UNIX command to build the image.ĮNV - Sets the environment variables. MAINTAINER - Specifies the Dockerfile Author Name and his/her email. For this post, we are using phusion/baseimage as our base image because it is a minimal Ubuntu-based image modified for Docker friendliness. Using docker build, you can start a build that executes all of the command-line instructions contained in the Dockerfile.Ĭommon Dockerfile instructions start with RUN, ENV, FROM, MAINTAINER, ADD, and CMD, among others.įROM - Specifies the base image that the Dockerfile will use to build a new image.
A Dockerfile is a simple text file that contains instructions that can be executed on the command line. Introduction to Dockerfilesĭocker builds images by reading instructions from a Dockerfile. Java Dockerize your Java Application Dockerize your Java ApplicationĪ Dockerfile is a fundamental building block used when dockerizing your Java applications, and it is how you can create a Docker image that can be used to create the containers you need for automatic builds.
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