Projects

Projects

Task 01: Nexus as a Container Registry

Objectives: Install Nexus as a Docker image, login, and push images.

Solution

  • Step 1: Run Nexus in Docker
mkdir -p ~/nexus-data && chmod 777 ~/nexus-data  
docker run -d --name nexus -p 8081:8081 -p 5000:5000 -v ~/nexus-data:/nexus-data sonatype/nexus3

  • Access Nexus UI: http://localhost:8081

  • Default admin credentials: admin / password in ~/nexus-data/admin.password

  • Step 2: Create a Private Docker Registry in Nexus

1. Login to Nexus UI (http://localhost:8081)  
2. Go to Administration → Repositories → Create repository  
3. Select docker (hosted)  
4. Name it docker-hosted  
5. Set HTTP Port to 5000  
6. Save

  • Nexus now acts as a Docker registry at http://localhost:5000

  • Step 3: Configure Docker to Trust Nexus Registry

Edit /etc/docker/daemon.json:  
{ "insecure-registries": ["localhost:5000"] }

Restart Docker: sudo systemctl restart docker

  • Step 4: Login to Nexus Docker Registry
    docker login localhost:5000 (enter Nexus admin credentials)

  • Step 5: Tag and Push an Image to Nexus

docker pull alpine:latest  
docker tag alpine:latest localhost:5000/my-alpine:1.0  
docker push localhost:5000/my-alpine:1.0
  • Step 6: Verify Image in Nexus
Go to Nexus UI → Browse → Repositories → docker-hosted  
You should see my-alpine:1.0 successfully pushed
  • Popular Docker Registries:

Docker Hub (public)

  • Harbor (open-source private),
  • JFrog Artifactory (enterprise),
  • GitLab Container Registry (integrated),
  • AWS ECR
  • Azure ACR
  • Google Artifact Registry/GCR