What is a Docker image?

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A Docker image serves as a fundamental component in containerization, acting as a template used to create containers. It consists of the application and all its dependencies, libraries, and configuration files bundled together. This encapsulation allows for consistent environments across various stages of development, testing, and production because the image will produce identical containers regardless of where or how they are run.

In contrast, a running instance of a container refers to the executable version that is created from a Docker image, which does not capture the idea of a static template. Log files of container activity are specific records of the operations and events that occur within a running container, thus not representative of the image itself. Network configurations for containers pertain to how containers connect and communicate with each other and external services, which is a different aspect altogether from what constitutes a Docker image.

Consequently, the designation of a Docker image as a template used to create containers emphasizes its role in the lifecycle of containerized applications.

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