Difference between Docker Image and Container?
Difference between Docker Image and Container?
Docker is open-source, virtualization software designed to ease specific application development. It is based on PaaS (platform-as-a-service) products model aimed at isolating virtualized environments to deploy, build, and test applications that are usually incompatible or not meant to work with the current OS.
The software in itself is fairly easy to master but the terminology术语 related to cocker can be quite baffling令人困惑的 at times. As docker creates novel新奇的 craze in virtualization, terms like images, images, containers, Dockerfiles, and volumes will need to be mastered.
It is a good idea to try to understand the basic roles of these entities. It will speed up learning on how you can work with them. One of the things many users stumble upon is the difference between a Docker image and a container.
This brief wiki will explain how the two differ, and also how they relate. Read more to find out.
What is a Docker Image?
A Docker image is non-changeable file containing libraries, source code, tools and other files needed to run applications.
Due to their read-only characteristics, docker images are also referred to as snapshots. The snapshots represent application and it's VE (virtual environment) at a given point of time. It is this consistency that makes Docker one of the most touted被吹捧的 virtualization applications ever. The ability to stamp time allows developers to experiment and test apps in various conditions.
'Images' may mean pictures in traditional sense but when docker is under the radar, 'images' become copies of an entire system in one, movable file. Because images but templates, you cannot run or execute them. But what you can do is use those templates and build a container on top of it. Container will ultimately be running images. Every time you create a container, it creates a writable layer right on top of an unchangeable image. This is it, you can now modify it the way you want.
Docker Container
Docker container is nothing but an environment virtualized during run-time to allow users to isolate applications from the system underpinning it. These containers are compact紧凑的,简洁的, portable轻便的 units in which you can start up an application quickly and easily.
A notable feature is the addition of standardized computing environment that runs inside the container at all times. Having this computing region is essential because it ensures that applications continue running the way they should ideally be running. Apart from facilitating computing, it also simplifies sharing among teammates.
As docker containers are entirely autonomous, they render essential service components by providing strong isolation, thereby ensuring containers don't interfere with one another, or with the server wherein they have been configured. As per Docker claims, the units have the strongest isolation capability in the industry existing today.
Containers are different than Virtual Machine that they deploy a different level of virtualization. Unlike VMs where virtualization takes place in the hardware, containers are virtualized in the app layer. It is often called the OS-level virtualization and its only downside is, both host and guest OS needs to be alike. Yet, however, they can make use of one machine, partition its kernel, virtualize the operating system and run isolated processes as if the fellow OS never existed.
Difference between Docker Image and Container?
Docker Image is a set of files which has no state, whereas Docker Container is the instantiation of Docker Image. In other words, Docker Container is the run time instance of images.
相关文章
- Docker实践:部署内网穿透frp
- docker探索-CentOS7中配置Docker的yum源并升级安装docker1.13(十)
- 【Docker】docker安装GitLab
- 创建docker公共仓库
- docker存储结构解析
- Docker - 构建镜像:使用docker commit命令
- [Docker] Run Stateless Docker Containers (Volumes with docker compose)
- [Docker] Create and run a Java application Docker image
- docker
- 运维基础之Docker(2)通过docker部署zookeeper nginx tomcat java redis kibana/elasticsearch/logstash mysql kafka mesos/marathon ftp git
- Docker - 构建镜像:使用docker build命令和Dockerfile文件
- [AWS] Lab: Docker and CodeCommit Part 1
- [Docker] Create and run a Java application Docker image
- [DevOps] Set up and run a PostgreSQL instance locally with Docker Compose
- [Docker] Container & image (docker run)
- 使用docker commit将修改后的容器保存为镜像及其使用注意事项
- 在 SAP 云平台上部署和运行 Docker 应用
- 【docker】Docker快速入门总结笔记(命令大全)
- 【docker】解决 Failed with result ‘exit-code‘和Start request repeated too quickly和Failed to start Docker
- docker挂载单文件问题
- y27.第二章 Docker从入门到精通 -- docker 仓库之分布式Harbor(九)
- 【云原生之Docker实战】在KVM虚拟机下安装Docker
- 中秋征文 | 【云原生之Docker】使用docker部署内网穿透工具FRP
- 【云原生之Docker实战】使用docker部署nightingale运维监控平台
- 【云原生之Docker实战】使用docker部署nacos平台
- Docker pull拉取镜像报错“Error response from daemon: Get “https://registry-1.docker.io/v2”解决办法
- Docker 创建镜像、修改、上传镜像
- 【云原生 • Docker】docker 环境搭建、docker 与容器常用指令大全
- 基于CentOS容器镜像制作可ssh登录的docker镜像
- 搭建企业级docker仓库—Harbor
- Docker重学系列之Docker Compose
- Centos7 安装 Docker