Build Docker Image using GitLab CI CD

In this article we are going to cover Build Docker Image using GitLab CI CD.

How to Install Docker on Ubuntu 20.04 LTS

Update System packages:

sudo apt update

Install Docker on Ubuntu 20.04 LTS

sudo apt install docker.io

How to Create a Docker file

Step 1: Create Dockerfile in the root directory of GitLab Maven Project Branch.

Step 2: Paste below code into it:

FROM openjdk
COPY target/*.jar /
EXPOSE 8080
ENTRYPOINT ["java","-jar","/my-app-1.0-SNAPSHOT.jar"]

How to Build Docker image using GitLab CI/CD Pipeline

Step 1: Create .gitlab-ci.yml file with below code:

stages:
  - build
  - build-docker-image

build-java-project:
  stage: build
  script:
    mvn package
  artifacts:
    paths:
      - /home/gitlab-runner/

build-docker-image:
  stage: build-docker-image
  script:
    - docker info
    - docker build -t devopshint/java-maven .

If your second job docker image failed then run below command:

sudo chmod 666 /var/run/docker.sock

So our job succeeded

Now lets check our docker image

You can see in below image our docker image java-maven

Conclusion:

In this article we have covered Build Docker Image using GitLab CI CD.

Related Articles:

• Build Java Project using Maven in GitLab CI/CD

Reference:

Build Docker Image using GitLab CI official page