Docker is an open-source platform designed to simplify the process of developing, shipping, and running applications by using containerization. Containers are lightweight, portable, and self-sufficient units that include everything needed to run a piece of software: the code, runtime, system tools, libraries, and settings.
These are the core units in Docker. Containers package an application and its dependencies together, ensuring that it runs consistently across different computing environments. Unlike virtual machines (VMs), containers share the host OS kernel, making them more efficient in terms of system resources.
This is a script containing a series of instructions on how to build a Docker image. It specifies the base image to use, the application code to include, and any necessary configurations or dependencies.
This is a cloud-based repository where users can share and access Docker images. It’s like a library of pre-built images that can be pulled and used to create containers.
This tool allows you to define and run multi-container Docker applications. With Docker Compose, you can use a `docker-compose.yml` file to configure your application’s services, networks, and volumes, making it easier to manage complex setups.
This is the runtime that powers the containers. It includes the Docker daemon, which handles building, running, and managing containers, and the Docker CLI (Command-Line Interface) used to interact with the Docker daemon.
Containers ensure that applications run the same way regardless of where they are deployed, reducing issues related to differences in environments.
Since containers encapsulate everything an application needs, they can be easily moved between different environments, such as development, testing, and production.
Containers run in isolation from each other, which helps prevent conflicts and makes it easier to manage dependencies.
Containers are more lightweight than VMs because they share the host OS kernel, which means they use fewer resources and start up faster.
Overall, Docker helps streamline the development and deployment processes by providing a consistent and efficient way to manage application environments.
