How to Dockerize Springboot Web App

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This blog represents instructions and code samples on how to Dockerize a Springboot Web app. The source code be found from this git repository.

Following are key aspects of this blog:

  • Dockerfile & image
  • Install the image
  • Run the container and access the app
Dockerfile & Image

Download the code from this page and put them all in a folder. Before we go one to create the image, lets know a little more about the Dockerfile. Following points need to be noted in the Dockerfile:

  • The image created is a Centos6 image
  • The Java is installed in a predefined path “/opt/jdk”
  • Then, Maven is installed and JAVA_HOMEĀ is set.
  • The source file is then copied to image.
FROM centos:centos6

# Setup Java
RUN mkdir /opt/jdk
RUN cd /opt

RUN yum -y install wget tar

RUN wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-x64.tar.gz

RUN tar -zxf jdk-8u5-linux-x64.tar.gz -C /opt/jdk

RUN update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_05/bin/java 100
RUN update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.8.0_05/bin/javac 100

# Setup Maven

WORKDIR /
RUN wget http://mirror.olnevhost.net/pub/apache/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz
RUN tar xvf apache-maven-3.0.5-bin.tar.gz

RUN mv apache-maven-3.0.5  /usr/local/apache-maven
ENV M2_HOME=/usr/local/apache-maven
ENV M2=$M2_HOME/bin
ENV PATH=$M2:$PATH
ENV PATH=$PATH:/usr/bin

ENV JAVA_HOME=/opt/jdk/jdk1.8.0_05

# Copy Source files

RUN mkdir src
ADD src /src
ADD pom.xml /

RUN mvn package

 

Install the Image

Following command is used to install the image:

docker build -f springboot.df -t springboot .

 

Run the container and Access the App

Following command can be used to start the container.

docker run -ti -d -p 8080:8080 --name demoapp -v /c/Users:/mnt springboot:latest /bin/bash

Once the container is started, access the container using following command:

docker attach demoapp

Go to “/” folder and execute following command. This would start the app on 8080 port. You could then access the app using the following URL: http://192.168.99.100:8080/. It will display “Hello World”

java -jar target/SpringBootSampleWeb-0.0.1.jar
Ajitesh Kumar

Ajitesh Kumar

Ajitesh is passionate about various different technologies including programming languages such as Java/JEE, Javascript, PHP, .NET, C/C++, mobile programming languages etc and, computing fundamentals such as application security, cloud computing, API, mobile apps, google glass, big data etc.Recently, he has been digging deep into the field of data science and machine learning.

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Ajitesh Kumar

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