Wednesday, March 20, 2024

How to Setup Self-Hosted Linux Docker Build Agent in Azure DevOps | How to configure Self-Hosted Linux Docker Agents in Azure Pipelines | Create Custom Build Agents in Azure DevOps

 Let us learn how to configure a self-hosted agent using Docker in Azure DevOps pipelines.

What is an Agent?

An agent is computing infrastructure with installed agent software that runs one job at a time.To build your code or deploy your software using Azure Pipelines, you need at least one agent. As you add more code and people, you'll eventually need more.

When your pipeline runs, the system begins one or more jobs. 

In Azure pipelines, there are two types of build agents:

  1. Microsoft-hosted agents - This is a service totally managed by Microsoft and it's cleared on every execution of the pipeline (on each pipeline execution, you have a fresh new environment).
  2. Self-hosted agents - This is a service that you can to set up and manage by yourself. This can be a custom virtual machine on Azure or a custom on-premise machine inside your infrastructure. In a self-hosted agent, you can install all the software you need for your builds, and this is persisted on every pipeline execution. A self-hosted agent can be on Windows, Linux, macOS, or in a Docker container.

You can set up a self-hosted agent in Azure Pipelines to run inside a Windows Server Core (for Windows hosts), or Ubuntu container (for Linux hosts) with Docker. We will learn in this article on how to host Ubuntu Docker container on Linux machines.

How to configure Self-hosted docker build agent?

1. Go to Azure DevOps dashboard -
2. Select your project dashboard
3. Go to your project settings
4. Click on Agent pools

Create a new Agent pool name

Enter name as myAgentPool or any name
Make sure you select Grant access permission to all pipelines

Login to Azure VM where the docker build agents will be running.

Step #1 - Install Docker CLI so we can build docker image

sudo apt update && sudo apt install -y

Step #2 - Add logged in user to docker group
sudo usermod -a -G docker $USER

Step #3 - Clone repo which has Dockerfile

git clone

Sample dockerfile is here.. please feel free to add any software in the docker agent.
FROM ubuntu:22.04

RUN apt update -y && apt upgrade -y && apt install curl git jq libicu70 maven -y

# Also can be "linux-arm", "linux-arm64".
ENV TARGETARCH="linux-x64"


COPY ./ ./
RUN chmod +x ./

# Create agent user and set up home directory
RUN useradd -m -d /home/agent agent
RUN chown -R agent:agent /azp /home/agent

USER agent
# Another option is to run the agent as root.


Step #4 - change directory
cd ado-docker-agent-repo/azp-agent-in-docker/

Step #5 - Build the Docker image
sudo docker build --tag "azp-agent:linux" --file Dockerfile .

Step #6: Run the agent as a container
Run the below command:

sudo docker run -e AZP_URL="" -e AZP_TOKEN="XXXX" -e AZP_POOL=myAgentPool -e AZP_AGENT_NAME="myLinuxDockerBuildAgent" --name "azp-agent" azp-agent:linux

that's it, docker agent is successfully started.

Step #7: Verify if docker agent is running or not
Run the below command:
sudo docker ps

Check the status of build Agent
Click on agentPool name, click on Agents

This confirms that Build agent is successfully configured in Azure DevOps and is available to run builds.

How to use the Docker build agent in your pipelines?

Please use the docker agent in the classic pipeline like below: select the agentPool

run the job. now you can see the jobs under myAgentPool--> Jobs

Here is the sample pipeline YAML code for automating Maven build for a Java project:

- main
name: myAgentPool
- stage: Build
displayName: Build stage
- job: MavenPackageAndPublishArtifacts
displayName: Maven Package and Publish Artifacts
- task: Maven@3
displayName: 'Maven Package'
mavenPomFile: 'MyWebApp/pom.xml'


Watch steps in YouTube channel:

Tuesday, March 12, 2024

How to Create Quality Gate in SonarQube and integrate with GitHub Actions | SonarQube Integration with GitHub Actions | Automate Code Scan using SonarQube In GitHub Actions and Force build to Fail or Pass


How to Create Quality gate in SonarQube and integrate with GitHub Actions?

Make sure SonarQube is up and running and integrated with GitHub Actions. Please click here if you would like to setup SonarQube and integrate with GitHub Actions.

We will be executing below steps:
  • Login to SonarQube
  • Create Quality Gate in SonarQube
  • Add conditions in Quality Gate
  • Make quality gate as Default
  • Create GitHub Actions CICD workflow yaml
  • Add tasks for Maven build and Sonar Scan
  • Add tasks for integrating Quality gate 
  • pass/fail the builds in SonarQube

What is Quality gate?

In SonarQube a quality gate is a set of conditions that must be met in order for a project to be marked as passed.

Create Quality Gate

Login to SonarQube, Click on Quality gate, enter some name

Once you create the quality gate. Click on Add condition. 

Select new issues from the drop down and enter 2 

Select new bugs from the drop down and enter 1 as error

Setup a Default Gate

Create GitHub Actions CICD workflow yaml:

Go to GitHub repo where your Java project is, create a new file:


The below file have four steps(tasks) 
    - Checkout
    - Install Java on runner
    - Build using Maven
    - run Sonar Scan (this task need to have projectKey defined, otherwise build will fail)
    - run quality gate check
    - pass/fail the build

Copy the the whole yellow color marked content from below:

name: CI/CD workflow for Maven Build, Sonar Code scan and Quality gate check
      - main
    runs-on: ubuntu-latest
    - name: Checkout code
      uses: actions/checkout@v3
    - name: Set up JDK 11
      uses: actions/setup-java@v2
        distribution: 'adopt'
        java-version: '11'
    - name: Build with Maven
      run: mvn install -f MyWebApp/pom.xml
    - name: SonarQube Scan
      uses: sonarsource/sonarqube-scan-action@master
        projectBaseDir: .
        args: >
        SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
        SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
    # Check the Quality Gate status.
    - name: SonarQube Quality Gate check
      id: sonarqube-quality-gate-check
      uses: sonarsource/sonarqube-quality-gate-action@master
      # Force to fail step after specific time.
      timeout-minutes: 5
       SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
    # Show the output from the Quality Gate.
    # The possible outputs of the `quality-gate-status` variable are `PASSED`, `WARN` or `FAILED`.
    - name: "Here is SonarQube Quality Gate Status value.."
      run: echo "The Quality Gate status is ${{ steps.sonarqube-quality-gate-check.outputs.quality-gate-status }}"

Commit the file.

As soon as you commit, build will run immediately in GitHub Actions. 
Now you can see the output of build in Actions tab.

Now login to SonarQube to see the Scan report

If your code have any defects, you can see some build fails.

SonarQube Quality gate failed:

Watch Steps in YouTube channel:

Thursday, March 7, 2024

Install Jenkins on Red Hat Enterprise Linux 9 | How to setup Jenkins on RHEL | Install Jenkins on Red Hat Linux

How to Install Jenkins on RedHat Enterprise Linux 9?

Please find below steps for setting up Jenkins on RHEL 9.


  • Memory should be t2.medium (4 GB RAM)
  • port 8080 opened in firewall rule to access Jenkins
  • Connect to EC2 instance using git bash or iTerm

update package

sudo yum update

Install wget
sudo yum install wget -y

Add Jenkins repository to yum repository
sudo wget -O /etc/yum.repos.d/jenkins.repo

sudo rpm --import

sudo yum upgrade -y

Java Installation

# Add required dependencies for the jenkins package 
sudo yum install fontconfig java-17-openjdk -y

Install Jenkins
sudo yum install jenkins -y
sudo systemctl daemon-reload

sudo systemctl enable jenkins

Start Jenkins
sudo systemctl start jenkins
sudo systemctl status jenkins

Now go to browser and access the Jenkins page.


Your page will look something like this. Now paste the password into the below Administrator password text box.

Get Jenkins Admin Password
sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Copy the output of the above command.
Press Continue..Click on install suggested plug-ins..

 Install suggested plug-ins.
Now create user name and password.
enter everything as admin. at least user name as admin password as admin
Click on Save and Finish. Click on start using Jenkins. Now you should see a screen like below:

That's it. You have setup Jenkins successfully 😊

Monday, March 4, 2024

How to Integrate Slack with GitHub Actions | Slack Integration with GitHub Actions| Send Push notifications to Slack GitHub Actions

Integrating Slack with GitHub Actions for sending Notifications


How to integrate Slack with GitHub Actions

We will be using slack GitHub Action Slack integration action for posting messages to Slack channel from GitHub Actions.

We will be following below steps:

1. Create a new App in
2. Select workspace in the app
3.Select incoming webhooks
4. Activate incoming webhook
5. Add new webhook integration
6. Select channel, Allow
7. Copy the webhook url

Create App from scratch

Enter App name and pick a workspace
Click on incoming webhooks
Activate incoming webhooks, click on Add new webhook to workspace

Select the channel where you want to send notfications

Copy webhook url

Add Slack Webhook URL as Secret in GitHub Actions
Go to your GitHub Repo --> Settings --> 

Click on Secrets and Variables under Security in left nav 
Click new Repository Secret
Add SLACK_WEBHOOK_URL with value

Create GitHub Actions CICD workflow yaml:

Go to GitHub repo where your Java project is, create a new file:


name: cicd-workflow with slack integration
    branches: [ "master" ]
    runs-on: ubuntu-latest
    - uses: act10ns/slack@v2
        status: starting
        channel: '#mar-2024-weekend-batch'
        message: Starting Docker Build image...
      if: always()
    - uses: actions/checkout@v3
    - name: Set up JDK 11
       uses: actions/setup-java@v2
         distribution: 'adopt'
         java-version: '11'
     - name: Build with Maven
       run: mvn install -f MyWebApp/pom.xml
    - uses: act10ns/slack@v2
        channel: '#mar-2024-weekday-batch'
        status: ${{ job.status }}
        steps: ${{ toJson(steps) }}
      if: always()

Watch Steps in YouTube channel:

DevOps Bootcamp Aug 2024 Schedule | DevOps & AWS Azure Cloud Coaching by Coach AK | DevOps and Cloud Computing Online Classes

  (Lot of new topics covered like GitHub Actions, Helm and Monitoring..) The DevOps requirements in the IT market space is expected to grow ...