In my case, this command returnsĭocker info command should return detailed information of the installed Docker machine of the host machine. Now, we can open the terminal to check some Docker commands.ĭocker -version command should return the Docker version. Then, I have to sign in using my Docker Hub credentials. After installation, we can see that the Docker app is running. Then, we will follow the instructions to set up a desktop Docker application. I am using Mac OS as my host machine. In this article, we will use Docker Hub as a Docker registry. Dockerfile > (Build) > Image > (Run) > Container Installation We can store different versions of images with different tag numbers to Docker Hub.ĭockerfile: It's a text file that contains all the commands to assemble an image. Registry:A registry is a storage and content delivery system that stores Docker images. In OOP terms, Image is a class, and a container is an instance of this class - a runtime object. It executes in a completely isolated environment. When an image is executed and takes place in memory, then the instance of this image is called a container. It's a snapshot of a container.Ĭontainer: An instance of an image is called a container. It contains everything needed to run an application, including libraries, config files, runtime, etc. Image: Image is the executable application package file inside Docker. A command line interface (CLI) client uses the services provided by Docker daemon with Docker command. This service exposes some rest APIs that can be used by the client. Docker daemon works as a server, which is the core part of Docker and is run on the host operating system. The main goal of this article is to implement Docker with a Spring Boot application and MySQL.ĭocker Engine works as a client-server architecture. Most of the time, container-based technology uses the kernel of the host machine. That's why application portability and infrastructure separation is easier.Ĭontainer-based technology takes lower resources of the host system. Docker moves up the abstractions of resources from hardware level to the operating system level. VM requires many hardware resources and processes. Virtual machines communicate with the host OS through hypervisor. On the other hand, VM is a technology that depends on the guest OS, which is completely separated from the host OS. Docker shares the kernel of the host operating system. Docker containers are sets of processes that are isolated from the rest of the processes in the host OS. Docker is an open source software so that everyone can run this on their own operating system, which should support virtualization and Docker for Mac/Windows/Linux.ĭocker also ships the ready images from one computer to another. Docker is a technology where developers or DevOps teams can build, deploy, and manage applications by using containers.
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