Container Registry

Pull Images from Registry

Learn how to pull container images from your DCR registry

Pull Images from Your Registry

Learn how to pull container images from your DCR registry to use in your deployments.

Prerequisites

A DCR registry with pushed images
Docker or Podman installed
Registry credentials

Step 1: Authenticate

First, authenticate with your registry:

docker login dcr.nexqloud.io/your-registry-name

Enter your credentials when prompted.

Step 2: Pull the Image

Pull your image using the full registry path:

docker pull dcr.nexqloud.io/your-registry-name/image-name:tag

Example:

docker pull dcr.nexqloud.io/dcp-dcr-demo-01/myapp:latest

Step 3: Verify the Pull

List your local images to verify:

docker images | grep dcr.nexqloud.io

Step 4: Run the Image

Run a container from your pulled image:

docker run -d -p 8080:8080 dcr.nexqloud.io/your-registry-name/image-name:tag

Pulling Specific Tags

Pull specific versions of your image:

# Pull latest version
docker pull dcr.nexqloud.io/your-registry-name/myapp:latest

# Pull specific version
docker pull dcr.nexqloud.io/your-registry-name/myapp:v1.0.0

# Pull environment-specific version
docker pull dcr.nexqloud.io/your-registry-name/myapp:production

Using in Kubernetes

To use your DCR images in Kubernetes, create an image pull secret:

Create a Secret

kubectl create secret docker-registry dcr-credentials \
  --docker-server=dcr.nexqloud.io/your-registry-name \
  --docker-username=<your-username> \
  --docker-password=<your-password> \
  --docker-email=<your-email>

Reference in Pod Spec

apiVersion: v1
kind: Pod
metadata:
  name: myapp
spec:
  containers:
  - name: myapp
    image: dcr.nexqloud.io/your-registry-name/myapp:latest
  imagePullSecrets:
  - name: dcr-credentials

Use in Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp
        image: dcr.nexqloud.io/your-registry-name/myapp:v1.0.0
        ports:
        - containerPort: 8080
      imagePullSecrets:
      - name: dcr-credentials

Using with Docker Compose

Reference your DCR images in docker-compose.yml:

version: '3.8'
services:
  webapp:
    image: dcr.nexqloud.io/your-registry-name/myapp:latest
    ports:
      - "8080:8080"
    environment:
      - NODE_ENV=production

Before running, ensure you're logged in:

docker login dcr.nexqloud.io/your-registry-name
docker-compose up -d

Automated Pulls in CI/CD

Configure your CI/CD pipeline to pull images:

GitHub Actions Example

- name: Login to DCR
  run: echo "${{ secrets.DCR_PASSWORD }}" | docker login dcr.nexqloud.io/your-registry-name -u ${{ secrets.DCR_USERNAME }} --password-stdin

- name: Pull Image
  run: docker pull dcr.nexqloud.io/your-registry-name/myapp:latest

GitLab CI Example

pull_image:
  stage: deploy
  script:
    - docker login -u $DCR_USERNAME -p $DCR_PASSWORD dcr.nexqloud.io/your-registry-name
    - docker pull dcr.nexqloud.io/your-registry-name/myapp:latest

Using with Podman

Pull images using Podman:

podman login dcr.nexqloud.io/your-registry-name
podman pull dcr.nexqloud.io/your-registry-name/myapp:latest
podman run -d -p 8080:8080 dcr.nexqloud.io/your-registry-name/myapp:latest

Troubleshooting

Authentication Failed

Verify credentials are correct
Check registry name is spelled correctly
Ensure credentials haven't expired

Image Not Found

Confirm the image exists in your registry
Check the tag is correct
Verify you have read permissions

Pull Timeout

Check your internet connection
Verify registry is accessible
Try pulling a smaller image first to test connectivity

Next Steps

Push Images to Registry

Learn how to push container images to your DCR registry

Manage Repositories

View and manage your container image repositories