> ## Documentation Index > Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Demo DTR Setup > This guide covers the installation and configuration of Docker Trusted Registry on a Universal Control Plane cluster. In this guide, we’ll install and configure Docker Trusted Registry (DTR) on a Universal Control Plane (UCP) cluster powered by Docker Enterprise Engine. ## Table of Contents 1. [Review Documentation and Prerequisites](#1-review-documentation-and-prerequisites) 2. [Prepare the DTR Node](#2-prepare-the-dtr-node) 3. [Add the DTR Node as a UCP Worker](#3-add-the-dtr-node-as-a-ucp-worker) 4. [Install Docker Trusted Registry](#4-install-docker-trusted-registry) 5. [Verify DTR Access](#5-verify-dtr-access) ## 1. Review Documentation and Prerequisites Before proceeding, review the official [Docker Trusted Registry installation guide](https://docs.docker.com/ee/dtr/admin/install/) and confirm your environment meets the requirements: | Requirement Type | Details | | --------------------- | ------------------------------------------------------------------------------ | | Software | Docker Enterprise Engine, fixed hostname on DTR node, UCP-managed worker nodes | | Hardware (Minimum) | 16 GB RAM, 2-core CPU, 10 GB free disk | | Hardware (Production) | 16 GB RAM, 4-core CPU, 25–100 GB free disk | | Network Ports | TCP 80, TCP 443 | Never co-locate a UCP manager and DTR on the same host—each requires its own node. ![The image shows a webpage from Docker documentation detailing the installation of Docker Trusted Registry (DTR) and Universal Control Panel (UCP), including a diagram illustrating the setup of manager and worker nodes.](https://kodekloud.com/kk-media/image/upload/v1752873846/notes-assets/images/Docker-Certified-Associate-Exam-Course-Demo-DTR-Setup/docker-dtr-ucp-installation-diagram.jpg) ## 2. Prepare the DTR Node ### 2.1 Remove Existing Docker Packages Ensure no conflicting Docker packages remain: ```bash theme={null} sudo yum remove -y \ docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-selinux \ docker-engine-selinux \ docker-engine ``` After removal, confirm that no Docker daemons are running:\ `ps aux | grep docker` ### 2.2 Install Docker Engine Enterprise Follow the [Docker Engine installation guide](https://docs.docker.com/engine/install/) for your OS. After installation, verify the Docker version: ```bash theme={null} docker version ``` Expected output snippet: ```text theme={null} Client: Docker Engine - Enterprise Version: 19.03.5 API version: 1.40 Server: Docker Engine - Enterprise Engine: Version: 19.03.5 API version: 1.40 ``` ## 3. Add the DTR Node as a UCP Worker 1. In UCP, navigate to **Shared Resources > Nodes**. 2. Click **Add Node**, select **Linux**, and choose **Worker**. 3. Copy the generated `docker swarm join` command: ```bash theme={null} docker swarm join \ --token SWMTKN-1-4liabct184f4xm0b3zr... \ 172.31.32.217:2377 ``` 4. On the DTR node, run the join command: ```bash theme={null} docker swarm join \ --token SWMTKN-1-4liabct184f4xm0b3zr... \ 172.31.32.217:2377 This node joined a swarm as a worker. ``` 5. Return to the UCP console and confirm the new worker status turns green. 6. In **Dashboard**, verify you have one manager and two workers. ![The image shows a Docker Enterprise Universal Control Plane dashboard displaying the status of manager and worker nodes, including CPU, memory, and disk usage statistics. It also includes sections for Swarm and Kubernetes services, with no active services or errors reported.](https://kodekloud.com/kk-media/image/upload/v1752873847/notes-assets/images/Docker-Certified-Associate-Exam-Course-Demo-DTR-Setup/docker-enterprise-control-plane-dashboard.jpg) ## 4. Install Docker Trusted Registry 1. In UCP, click your admin username, then navigate to **Admin Settings > Docker Trusted Registry**. 2. Select your DTR node and, if needed, set an external DTR URL. For demos, you can enable **Disable TLS verification** (not recommended for production). 3. Copy the installer command and replace `--ucp-url` with your manager’s private IP: ```bash theme={null} # Discover the manager's private IP ip addr show eth0 # Run the installer docker run -it --rm docker/dtr install \ --ucp-node dtrnode \ --ucp-username yogeshraheja \ --ucp-url https://172.31.32.217 \ --ucp-insecure-tls ``` 4. Enter your UCP password when prompted. The installer will: * Pull the `docker/dtr` image * Perform prechecks on ports 80 and 443 * Create the `dtr-ol` network * Provision certificates, volumes, and database containers ```text theme={null} Unable to find image 'docker/dtr:latest' locally latest: Pulling from docker/dtr ... INFO[0000] Beginning Docker Trusted Registry installation ucp-password: INFO[0008] Verifying [80 443] ports on dtrnode INFO[0015] Creating network: dtr-ol ... INFO[0028] Installation is complete INFO[0029] Replica ID is set to: f469e841601a ``` ## 5. Verify DTR Access 1. Retrieve the public IP of your DTR node from your cloud provider. 2. Open `https://` in a browser. 3. Log in with your UCP credentials. On first access, no repositories appear. 4. Explore the DTR sidebar for **Users**, **Organizations**, **Repositories**, and **Settings**. Congratulations! You now have Docker Enterprise Engine, Universal Control Plane, and Docker Trusted Registry fully operational. ## Links and References * [Docker Trusted Registry Admin Guide](https://docs.docker.com/ee/dtr/admin/install/) * [Docker Engine Install Documentation](https://docs.docker.com/engine/install/) * [Docker Enterprise UCP Documentation](https://docs.docker.com/ee/ucp/)