Following are the key points described later in this article:
- Java 8 Image Dockerfile
- Install Scripts to Install and Start Java8 Env
Java 8 Image Dockerfile
Following is Dockerfile for creating Java8 image. Name the file as java8_base.df.
# Base is the Centos environment FROM centos:centos6 # Make the directories under which Java 8 will get installed RUN mkdir /opt/jdk RUN cd /opt # Install wget and tar which will be used to download and unzip Java8 files RUN yum -y install wget tar # Download the files RUN wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-x64.tar.gz # Unzip in /opt/jdk folder RUN tar -zxf jdk-8u5-linux-x64.tar.gz -C /opt/jdk # Set the path for Java and Javac 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
Install Scripts to Install and Start Java8 Env
Following scripts perform following two activities:
- If Java8 image, java8_base, is not found, it builds the Java8 image. This is one time activity.
- Stops and starts the container
One may name the script as “startJava8.sh” and use it such as “startJava8.sh j8” where j8 is the name of the container. Make sure to put both of the above files, java8_base.df and start8Java.sh in the same folder.
#!/bin/sh if [ $# == 0 ]; then echo "This script expect container name argument. Example: ./installJava8.sh j8" exit 100 fi docker stop $1;docker rm $1 # Build Java8 image if it does not exists # j8_image="java8_base" j8_df="java8_base.df" if [ `docker images $j8_image | wc -l` -lt 2 ]; then echo "Docker Image $j8_image do not exist..." echo "Builing docker image $j8_image" if [ -f $j8_df ]; then docker build -t $j8_image -f $j8_df . else echo "Can't find Dockerfile $j8_df in the current location" exit 200 fi fi docker run --privileged=true -ti -dP --name $1 -v /c/Users:/mnt/Users $j8_image /bin/bash docker exec -ti $1 /bin/bash
He has also authored the book, Building Web Apps with Spring 5 and Angular.