Docker is a virtualization platform that allows different operating systems to run on the same machine. It helps in the separation of infrastructure and applications, allowing for the rapid delivery of software. Docker virtualization, commonly known as Docker containers, is done at the system level.
Docker containers run on top of the Operating system of the host computer. This helps you to improve efficiency and security.
Why use Docker?
Docker is a Virtualization software that allows you to run different operating systems on the same computer.
Docker is the client-server type of application, which implies it has clients that communicate with the server.
Our container's "source code" is Docker images.
What is Virtualization?
Previously, installing a service was a tedious and painful procedure. Developers would write code first, and then the operations team would deploy it on bare metal computers, where they would need to look for library versions, patches, and language compilers in order for the code to work. If there were any bugs or errors, the process would restart, the developers would fix them, and the operational team would deploy it again.
Docker Architecture
Here are the Docker main components in the Docker Architecture:
Docker Engine
Docker is a client-server application, which implies it has clients that communicate with the server. The Docker engine, often known as dockerd, is the Docker daemon that represents the Server. The docker daemon and clients can run on the same or other hosts, and they communicate via a command-line client binary and a comprehensive RESTful API to interface with the daemon: dockerd.
Docker Images
We utilise Docker images to build containers since they represent the "source code" for our containers. They can have software pre-installed, which makes deployment go more quickly. They're lightweight, and we may utilise pre-made images or create our own.
Docker Registries
Docker stores the image we build in registries. There are two types of registries: public and private. Docker Hub is a public registry run by the Docker corporation, where you can also save images privately.
Docker Containers
Containers are organisational units and a Docker fundamental concept. When we create an image and run it, we are doing so in a container. Because of the portability of the programme we have running in our container, the container analogy is employed. We can move it, or "ship" it, alter it, manage it, construct or delete it, and destroy it, much like cargo ships do with real containers.
A picture is a template, and a container is a replica of that template in simple terms. Multiple containers (copies) of the same image are possible.
Summary
Docker is a virtualization platform that allows different operating systems to run on the same machine. It helps in the separation of infrastructure and applications, allowing for the rapid delivery of software.
Docker Architecture: Docker Engine, Docker Images, Docker Registries, Docker Containers.
Docker Engine: Docker is the client-server type of application, which means that it has clients that transmit information to the server.
Docker Images: We utilise Docker images to build containers since they represent the "source code" for our containers. They're lightweight, and we can utilise pre-existing photos or create our own.
Docker Registries: Docker stores the images in registries. Docker company has public registray called Docker hub, where you can store images privately.
Docker Containers: Containers are organisational units and a fundamental notion in Docker. When we create an image and run it, we are doing so in a container.
