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_HOME 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
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