3. Basic Elements of Docker Technology
1. Docker image: Docker images are the basis of containers. An Image is an ordered collection of root filesystem changes and the corresponding execution parameters for use within a container runtime. An image typically contains a union of layered filesystems stacked on top of each other. An image does not have state and it never changes.
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2. Container: A container is a runtime instance of a Docker image. A Docker container consists of: A Docker image, an execution environment and a standard set of instructions. The concept is borrowed from Shipping Containers, which define a standard to ship goods globally. Docker defines a standard to ship software.Usually, a container will “contain” something singular from a functional point of view, like a service, a microservice or a more monolithic application process. It is a 1:1 relationship. For instance, each microservice process would “be” a single container, too.
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3. Repository: A repository is a set of Docker images. A repository can be shared by pushing it to a registry server. The different images in the repository can be labeled using tags.
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4. Registry: A Registry is a hosted service containing repositories of images which responds to the Registry API. The default registry (from Docker as an organization) can be accessed using a browser at Docker Hub or using the docker search command.
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5. Docker Hub: The Docker Hub is a centralized resource for working with Docker and its components. It provides the following services: Docker image hosting, User authentication, Automated image builds plus work-flow tools such as build triggers and web hooks, Integration with GitHub and Bitbucket.
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6. Docker Trusted Registry: Docker Trusted Registry (DTR) is the enterprise-grade image storage solution from Docker. You install it behind your firewall so that you can securely store and manage the Docker images you use in your applications. Docker Trusted Registry is a suc-product included as part of the Docker Datacenter product.
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