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Docker Community Engine on Ubuntu 20.04 LTS

Docker is a popular platform for containerization, allowing developers and sysadmins to build, run, and share applications within containers. Here’s a breakdown of the information you provided:

Docker Daemon (dockerd): Docker daemon is the background service that manages Docker containers. It listens for Docker API requests and handles Docker objects like images, containers, networks, and volumes.

Docker Features:

Lightweight Containers: Containers are lightweight and start quickly. They also efficiently utilize system resources, making them an efficient choice for application deployment.

Docker Registry: Docker provides a registry where Docker images can be stored and shared. Docker Hub is a popular public registry for Docker images.

REST API: Docker exposes a RESTful API that allows programs to communicate with the Docker daemon. This API lets you instruct Docker on what to do, such as creating or managing containers.

Command Line Interface (CLI): Docker offers a command-line interface (CLI) that allows users to interact with Docker and perform various container-related tasks using commands like docker run, docker build, and more.

Namespaces: Docker uses namespaces to provide a layer of isolation between containers. This isolation ensures that containers do not interfere with each other or with the host system.

Control Groups (cgroups): Control groups are used to limit the resources that a container can use, such as CPU, memory, and disk I/O. This helps in resource management and prevents one container from monopolizing resources.

Union File Systems (UnionFS): Union file systems, like UnionFS, enable Docker to create lightweight and efficient layers for containers. They allow for the efficient sharing of filesystems between containers.

Container Format (libcontainer): Docker uses libcontainer as its default container format. It provides a standard interface for working with containers and manages the low-level container runtime.

Access to Docker Hub: Docker Hub is a public repository for Docker images. Users can access and download pre-built Docker images from Docker Hub to use in their own containerized applications.

Docker is widely used in the development and deployment of applications because it simplifies the process of packaging an application and its dependencies into a portable container. This containerization makes it easier to deploy applications consistently across different environments.

Docker is a popular platform for containerization, allowing developers and sysadmins to build, run, and share applications within containers. Here’s a breakdown of the information you provided:

Docker Daemon (dockerd): Docker daemon is the background service that manages Docker containers. It listens for Docker API requests and handles Docker objects like images, containers, networks, and volumes.

Docker Features:

Lightweight Containers: Containers are lightweight and start quickly. They also efficiently utilize system resources, making them an efficient choice for application deployment.

Docker Registry: Docker provides a registry where Docker images can be stored and shared. Docker Hub is a popular public registry for Docker images.

REST API: Docker exposes a RESTful API that allows programs to communicate with the Docker daemon. This API lets you instruct Docker on what to do, such as creating or managing containers.

Command Line Interface (CLI): Docker offers a command-line interface (CLI) that allows users to interact with Docker and perform various container-related tasks using commands like docker run, docker build, and more.

Namespaces: Docker uses namespaces to provide a layer of isolation between containers. This isolation ensures that containers do not interfere with each other or with the host system.

Control Groups (cgroups): Control groups are used to limit the resources that a container can use, such as CPU, memory, and disk I/O. This helps in resource management and prevents one container from monopolizing resources.

Union File Systems (UnionFS): Union file systems, like UnionFS, enable Docker to create lightweight and efficient layers for containers. They allow for the efficient sharing of filesystems between containers.

Container Format (libcontainer): Docker uses libcontainer as its default container format. It provides a standard interface for working with containers and manages the low-level container runtime.

Access to Docker Hub: Docker Hub is a public repository for Docker images. Users can access and download pre-built Docker images from Docker Hub to use in their own containerized applications.

Docker is widely used in the development and deployment of applications because it simplifies the process of packaging an application and its dependencies into a portable container. This containerization makes it easier to deploy applications consistently across different environments.

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