Creating and Publishing Your First Docker Image

Creating and Publishing your own docker Image

In this post, we will create our own docker image and push it in docker hub.
We will be shipping the image prebuilt with jdk, and maven.

Creating the image

$ sudo docker pull ubuntu

Create a container from the Ubuntu image:

$ sudo docker run -it --name ${container_name} ubuntu:latest
eg.
$ sudo docker run -it --name javaimg ubuntu:latest

Manually installing java in the container

Create a folder /java in container you just created

mkdir /java

On base machine download jdk (.tar.gz file) from Oracle (http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html) Copy the downloaded file from base machine to the /java folder in docker container you just created. From the directory where file is downloaded run:

sudo tar -cv jdk-8u91-linux-x64.tar.gz | sudo docker exec -i javaimg tar x -C /java

Inside container go to /java and extract the jdk file

tar -xvzf jdk-8u91-linux-x64.tar.gz

Move the extracted contents to /usr/lib/jvm folder

sudo mv /java/jdk1.8.0_91/ /usr/lib/jvm/oracle_jdk8

Add new jdk alternatives

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/oracle_jdk8/jre/bin/java 2000
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/oracle_jdk8/bin/javac 2000
sudo update-alternatives --config java
sudo update-alternatives --config javac

Create a file /etc/profile.d/oraclejdk.sh, replace the contents from the file in this repository and set the paths by running

source /etc/profile.d/oraclejdk.sh

Manually installing maven in the container

Create a folder /maven in container you just created

mkdir /maven

On base machine download apache maven binary (.tar.gz file) from Apache Maven official site (https://maven.apache.org/download.cgi) Copy the downloaded file from base machine to the docker container. From the directory where file is downloaded run:

sudo tar -cv apache-maven-3.3.9-bin.tar.gz | sudo docker exec -i javaimg tar x -C /maven

Inside container, go to /maven and extract the file

tar -xvzf apache-maven-3.3.9-bin.tar.gz

Move the extracted contents to /usr/lib/maven folder

sudo mv /maven/apache-maven-3.3.9/ /usr/lib/maven

Set the maven path

export PATH=/usr/lib/maven/bin:$PATH

Verify by checking maven version

mvn -v

Commit the changes and Push the image

Exit from the container and commit the changes in a new image

docker commit -m "maven and java added" -a "{author name}" {container_id} {new_image_name}:{tag}
eg
docker commit -m "maven and java added" -a "Narender Kumar" e3f03f2f779d mavenimg:1.0

You can push the image in docker hub now using below command

sudo docker push {your_dockerhub_account_name}/{new_image_name}:{tag}