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[Docker](https://www.docker.com) 是个划时代的开源项目,它彻底释放了计算虚拟化的威力,极大提高了应用的维护效率,降低了云计算应用开发的成本!使用 Docker可以让应用的部署、测试和分发都变得前所未有的高效和轻松

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#
Docker
* `Image`
* `Container`
* `Repository`
# Basic Concepts
Docker contains 3 basic concepts
* `Image`
* `Container`
* `Repository`
Docker
Only after knowing the above 3 concepts will we get a deeper understanding of the lifecyle of docker.

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## Docker
## Docker Container
`Image``Container` `` `实例`
The relationship between `Image` and `Container` is just as `Class` and `Instance` in [OOP](https://en.wikipedia.org/wiki/Object-oriented_programming). `Image` is the static definition of `container`, while `containers` are the `images` in running state. `Containers` can be created, started, paused, deleted or stopped.
宿 [](https://en.wikipedia.org/wiki/Linux_namespaces)。因此容器可以拥有自己的 `root` 文件系统、自己的网络配置、自己的进程空间,甚至自己的用户 ID 空间。容器内的进程是运行在一个隔离的环境里,使用起来,就好像是在一个独立于宿主的系统下操作一样。这种特性使得容器封装的应用比直接在宿主运行更加安全。也因为这种隔离的特性,很多人初学 Docker 时常常会混淆容器和虚拟机。
The essence of `container` is `process`, but different from that in the host OS, the container processes run in their individual [`namespaces`](https://en.wikipedia.org/wiki/Linux_namespaces). With the namespace, a container can have its own `root` filesystem, network configurations, process space and even an ID sapce for users. The processes in a container run in an isolated environment, thus can be used as if it were an individual OS independent of the host OS. This feature makes docker-encapsulated applications safer than those running directly on the host. And that's also an important factor that confuses the novices to tell it from virtual machines.
使 ****
As we've discussed, `multi-layered filesystem` is applied to images, and so as the containers. When a container is running, it is based on its image, with a writable layer created on top of it. We call this layer prepared for R/W at runtime [**`Container Layer`**](https://docs.docker.com/storage/storagedriver/#images-and-layers).
The lifecyle of the container layer is the same as contaier. The container layer dies as soon as the container dies. Therefore, anything stored at the container layer will be discarded when the container is deleted.
Docker 使 [Volume](../data_management/volume.md)宿宿
As recommended by the [Docker Development Best Practices](https://docs.docker.com/develop/dev-best-practices/#where-and-how-to-persist-application-data), we should not write any data to the container layer to make it stateless. All file write operations should adhere to [`Volume`](../data_management/volume.md) or bind mounts. Writing to volume or bind mounts skips the container layer and R/W to host storage(or network storage) directly, which achieves better performance and stability.
使
The lifecyle of volume is independent of the container, and will not vanish when the container is deleted. In light of it, the data persists when a container is deleted or restarted.

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## Docker Registry
宿使[Docker Registry](../repository/registry.md)
After the construction of an image, we can easily run it on a host. However, if we want to use the image on other servers, we need a centralized image storage and distribution service. The [Docker Registry](../repository/registry.md) we will introduce is such a service.
**Docker Registry** ****`Repository` ****`Tag`
A **Docker Registry** can contain several `Repositories`, where each repository can contain several tags and each tag corresponds to an image.
`<仓库名>:<标签>` `latest`
Typically, a repository contains images for different versions of the same software, where each tags corresponds to different versions of the software. We can uniquely identify an image of the same software with `repository:tag`. In case not explicitly specified, `latest` is taken as default tag.
[Ubuntu ](https://hub.docker.com/_/ubuntu) 为例,`ubuntu` 是仓库的名字,其内包含有不同的版本标签,如,`16.04`, `18.04`。我们可以通过 `ubuntu:16.04`,或者 `ubuntu:18.04` 来具体指定所需哪个版本的镜像。如果忽略了标签,比如 `ubuntu`,那将视为 `ubuntu:latest`。
Taking the [Ubuntu Image](https://hub.docker.com/_/ubuntu) as an example. `ubuntu` is the name for repository, and inside it are tags for different versions, for instance, `16.04`, `18.04`. We can use `ubuntu:16.04` or `ubuntu:18.04` to specify the particular image we want. If the tag is omitted, for example, `ubuntu`, then it will be considered as `ubuntu:latest`.
** `jwilder/nginx-proxy` Docker Registry 使 Docker Registry
Repository name is typically seperated by a forward slash(/), for example, `jwilder/nginx-proxy`, the former is to identify a particular user in a multi-user Docker Registry, while the latter corresponds to the software name. But it is not always the case. It also depends on the Docker Registry software or service you are using.
### Docker Registry
### Docker Registry Public Services
Docker Registry 使 Registry
`Docker Registry Public Services` are registry services open to users, allowing users to manage their images. Typically, those public services offer user free image uploads and downloads, and possibly provide charged service for privately managed images.
使 Registry [Docker Hub](https://hub.docker.com/),这也是默认的 Registry并拥有大量的高质量的官方镜像。除此以外还有 [CoreOS](https://coreos.com/) 的 [Quay.io](https://quay.io/repository/)CoreOS 相关的镜像存储在这里Google 的 [Google Container Registry](https://cloud.google.com/container-registry/)[Kubernetes](https://kubernetes.io/) 的镜像使用的就是这个服务。
The most commonly used registry public service is the official [Docker Hub](https://hub.docker.com/), which is the default registry with thousands of high quality official images. Besides, the images for [Quay.io](https://quay.io/repository/) and CoreOS of [CoreOS](https://coreos.com/) are stored there. Google's [Google Container Registry](https://cloud.google.com/container-registry/) and [Kubernetes](https://kubernetes.io/) also use this service.
访 Docker Hub `Registry Mirror`**** [](https://cr.console.aliyun.com/#/accelerator)、[DaoCloud 加速器](https://www.daocloud.io/mirror#accelerator-doc) 等。使用加速器会直接从国内的地址下载 Docker Hub 的镜像,比直接从 Docker Hub 下载速度会提高很多。在 [安装 Docker](../install/mirror.md) 一节中有详细的配置方法。
Due to some reasons knwon to all, accessing those services from China mainland is slow. There are some cloud service providers in China providing `Registry Mirror` for Docker Hub, those mirror services are called `accelerators`. The well-known ones are [Ali Cloud Image Accelerator](https://cr.console.aliyun.com/#/accelerator) and [DaoCloud Accelerator](https://www.daocloud.io/mirror#accelerator-doc). In China, downloading from these services are much faster than from Docker Hub. The detailed image source configuration tutorial is in the [Docker Installation](../install/mirror.md) section.
Docker Hub [](https://hub.tenxcloud.com/)、[网易云镜像服务](https://c.163.com/hub#/m/library/)、[DaoCloud 镜像市场](https://hub.daocloud.io/)、[阿里云镜像库](https://cr.console.aliyun.com) 等。
There are also some cloud service providers that provide public services similar to Docker Hub in China. For example, [Tenxcloud Mirror Registry](https://hub.tenxcloud.com/), [NetEase Mirror Registry](https://c.163.com/hub#/m/library/), [DaoCloud Mirror Market](https://hub.daocloud.io/), [Ali Cloud Mirror Registry](https://cr.console.aliyun.com), etc.
### Docker Registry
### Private Docker Registry
使 Docker RegistryDocker [Docker Registry](https://hub.docker.com/_/registry/) 镜像,可以直接使用做为私有 Registry 服务。在 [私有仓库](../repository/registry.md) 一节中,会有进一步的搭建私有 Registry 服务的讲解。
Apart from using public service, a user can set up private Docker Registry. Docker offical offers the [Docker Registry](https://hub.docker.com/_/registry/) docker image, which can be deployed for private registry service. We will explain how to set it up in detail in the [Private Registry](../repository/registry.md) section.
Docker Registry [Docker Registry API](https://docs.docker.com/registry/spec/api/) 的服务端实现,足以支持 `docker` 命令,不影响使用。但不包含图形界面,以及镜像维护、用户管理、访问控制等高级功能。在官方的商业化版本 [Docker Trusted Registry](https://docs.docker.com/datacenter/dtr/2.0/) 中,提供了这些高级功能。
The open source Docker Registry image only provides the backend of [Docker Registry API](https://docs.docker.com/registry/spec/api/), which supports the `docker` commands and is enough for personal use, although the advanced functionalities like GUI(Graphical User Interface), Image Maintenance and Access Control are not supported. However, they are provided in the commercial version - [Docker Trusted Registry](https://docs.docker.com/datacenter/dtr/2.0/).
Docker Registry Docker Registry API[Harbor](https://github.com/goharbor/harbor) 和 [Sonatype Nexus](../repository/nexus3_registry.md)。
Except for the official Docker Registry, there are third-party softwares that implement Docker Registry API, even with some advanced features like user interface. For example, [Harbor](https://github.com/goharbor/harbor) and [Sonatype Nexus](../repository/nexus3_registry.md).