Docker is an open-source platform that makes using containers to build, ship, and operate applications easier. With the use of containers, developers may bundle dependencies and apps to make them uniform and portable across many contexts. A short reference guide to the key Docker Commands and ideas for using Docker efficiently is provided by this cheat sheet.
Docker is a containerization platform enabling developers to create, deploy, and manage applications within isolated containers. These containers package the application code, runtime, libraries, and dependencies, ensuring consistency and efficiency across various systems.
Learn More: A Complete Guide on Docker for Beginners
Docker is a platform that lets you use containers to develop, launch, and operate applications. However, what are containers precisely, and how does Docker CLI operate? Let’s dissect it.
The code, runtime environment, system tools, and libraries required to run an application are all included in a container, which is a small, stand-alone package. An independent operating system is not needed for containers, in contrast to virtual machines (VMs). Instead, they share the host machine’s operating system kernel, making them more lightweight and efficient.
Docker Compose uses a client-server architecture, with the Docker CLI Engine at the core. The Docker Engine consists of three main components:
Here’s a typical workflow when working with Docker CLI:
By understanding how Docker works and leveraging its capabilities, developers can streamline their application development, deployment, and maintenance processes.
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Docker Compose follows a client-server architecture:
To install Docker on your system, follow the appropriate instructions for your operating system. Below are the steps for Windows and MacOS.
Check system requirements
Windows 10 64-bit: Pro, Enterprise, or Education editions
Hardware Virtualization enabled in BIOS/UEFI (Intel VT-x/AMD-V)
Download Docker Desktop
Go to Docker’s official website and download the Docker Desktop installer for Windows.
Install Docker Desktop
Run the installer you downloaded and follow the installation wizard. It will guide you through the process.
Start Docker
Once installed, Docker Desktop should start automatically. You’ll see the Docker icon in the system tray when it’s running.
Check system requirements
macOS Sierra 10.12 or newer
macOS must be a 2010 or newer model, with Intel’s hardware support for Memory Management Unit (MMU) virtualization.
Download Docker Desktop for Mac
Visit Docker’s official website and download the Docker Desktop installer for macOS.
Install Docker Desktop
Open the downloaded .dmg file, and drag the Docker icon into the Applications folder.
Start Docker
Open Docker from the Applications folder. It will appear in the menu bar, indicating that it’s running.
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Docker Registry is a service that stores and manages Docker images. It acts as a central repository where users can store, share, and pull Docker images. Docker Hub is a public Docker Registry, while private registries can be set up for secure internal image storage.
A Docker Repository is a collection of related images with the same name, differentiated by tags representing different versions or configurations. Users can push images to a repository in a registry, and others can pull those images to run containers. Registries and repositories are crucial in simplifying image distribution and facilitating collaborative development in the Docker ecosystem.
Below are the docker cheat sheet, Docker Commands for various functions-
To run a container from an image, use the following command: docker run [options] IMAGE [command]
For example, to run an Nginx web server: docker run -d -p 80:80 nginx
Docker Compose is a tool for defining and managing multi-container Docker applications. It configures the application’s services, networks, and volumes using a YAML file. With Docker Compose, you can easily spin up complex environments and applications. Here are the commands for it Docker Compose cheat sheet-
Services in Docker Swarm mode define the tasks on a cluster. They allow you to scale the application across multiple nodes and ensure high availability. Here are the Docker Commands for it:
To execute Docker Commands inside a running container, use: docker exec [options] CONTAINER_ID COMMAND [ARG…]
For example, to access the shell of a running container: docker exec -it CONTAINER_ID sh
In conclusion, Docker is an essential containerization platform that simplifies the process of building, shipping, and running applications by encapsulating them and their dependencies in isolated containers. With this comprehensive cheat sheet, users can efficiently harness the power of Docker, streamline application deployment, and maintain consistency across diverse environments.
A. Docker simplifies application development, deployment, and management through containerization, ensuring consistency across environments.
A. Containers, like those in Docker, package applications and dependencies, improving deployment efficiency.
A. Docker Engine consists of the Daemon, Client, and Docker Objects, essential for managing containers and images.
A. Docker offers consistency, isolation, portability, and scalability, benefiting both developers and operations teams.
A. The Docker workflow involves creating a Dockerfile, building images, launching containers, and distributing them across various environments.