Docker REST API

Docker is a platform that uses containerization to allow developers to package applications and their dependencies into a standardized unit for software development. This ensures that the application runs consistently across different computing environments. Docker containers are lightweight, portable, and can be easily managed and orchestrated.

What is Docker REST API

Docker is an open-source platform that automates the deployment of applications inside lightweight, portable containers. Containers include everything needed to run the application, such as the code, runtime, libraries, and system tools, ensuring that the application runs consistently regardless of the environment.

Docker was first released in 2013 by Docker, Inc. and has since become a cornerstone of modern DevOps practices. It simplifies the development lifecycle by allowing developers to create, test, and deploy applications in a consistent environment. This reduces the 'it works on my machine' problem and accelerates the development process.

Docker containers are isolated from each other and the host system, providing a secure and efficient way to run multiple applications on the same hardware. Docker also integrates with various orchestration tools like Kubernetes, making it easier to manage and scale applications in production environments.

Docker REST API runs on TCP port 2375 and is an official IANA open_in_new port number.

Security risk

If port 4243 is open and Docker is running, it can expose the Docker daemon to unauthorized access. This could allow attackers to execute arbitrary commands, deploy malicious containers, or gain control over the host system. It is crucial to secure this port with proper authentication and firewall rules.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 2375. Use StackChanges to monitor if the Docker REST API port is closed and stays closed. StackChanges will send an alert if port 2375 is open again.