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Configure Nexus as a Docker Registry: A Comprehensive Guide
Introduction
Nexus is a popular repository manager that enables organizations to store, manage, and distribute various artifacts, including Docker images. Configuring Nexus as a Docker registry allows you to host and manage your private Docker image repository, providing greater control over image distribution and security.
Prerequisites
Before you begin, ensure you have the following:
- A running Nexus instance
- Docker installed on your system
Creating a Docker Hosted Repository
1. Log in to your Nexus instance and navigate to "Repositories" > "Docker." 2. Click on "Create Repository" and provide a name and description for your new repository. 3. Select "Hosted" as the repository type and choose the desired Docker version.
Configuring SSL for Nexus
If you have a proxy server configured, it may interfere with communication between your desktop and Nexus. To resolve this:
- Create a self-signed SSL certificate for Nexus by following the instructions in the Nexus documentation.
- Configure your proxy server to trust the newly created certificate.
Exposing the Docker Port
To access your Docker registry externally, you need to expose the appropriate port. Run the following command:
Docker run -d -p 8081:8081
Replace 8081 with the desired port number.
Configuring Docker to Use Nexus as a Registry
Update your Docker configuration to point to your Nexus registry. In your ~/.docker/config.json file, add the following:
{ "registries": { "nexus.example.com": { "url": "https://nexus.example.com/repository/docker-hosted/", "username": "username", "password": "password" } } } Troubleshooting
- Cannot connect to Nexus registry: Verify that the SSL certificate is configured correctly and that your proxy server is configured to trust it.
- Images not being uploaded to Nexus: Ensure that you have configured your Docker image to be pushed to the correct Nexus repository.
Conclusion
By following these steps, you can successfully configure Nexus as a Docker registry and host and manage your own private Docker images. This enhances control over your image distribution, improves security, and streamlines your Docker workflow.
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