docker in all

docker vs hyper-v,vmware,xen,kvm

docker host, docker container, docker engineen, docker image

docker操作示意圖

workflow

开始使用docker(以windows下为例)

PS G:\dockerdata> docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:2557e3c07ed1e38f26e389462d03ed943586f744621577a99efb77324b0fe535
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

PS G:\dockerdata> docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest fce289e99eb9 2 months ago 1.84kB
docker4w/nsenter-dockerd latest 2f1c802f322f 4 months ago 187kB

以上docker run hello-world命令本质上的执行过程：

1. docker client向docker daemon(engine)联络,告诉docker engine,请帮我运行一个hello-wold container

2. docker daemon(engine)收到该命令后先在本地查找是否有hello-world这个image，如果没有则从regisry查找并且pull下来

3. docker daemon以该image实例化一个container,并且运行该image定义的executable，而这个executable将产生output;

4. docker daemon streamed that output to the docker client,这样我们就看到了hello world的消息

修改默认pull image存放位置

在windows下本质上docker engine是工作在hyper-v虚拟机中，所有的docker客户端敲的命令在该虚拟机中运行，pull的image也放在该虚拟机中，因此我们要修改image保存的位置实际上只要修改hyper-v的MobyLinuxVM对应的vhdx文件的位置即可。

http://www.cnblogs.com/show668/p/5341283.html

docker ps/docker images

PS G:\dockerdata> docker images
REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
hello-world                latest              fce289e99eb9        2 months ago        1.84kB
docker4w/nsenter-dockerd   latest              2f1c802f322f        4 months ago        187kB
PS G:\dockerdata> docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
PS G:\dockerdata> docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
135da1372a06        hello-world         "/hello"            24 minutes ago      Exited (0) 24 minutes ago                       modest_spence

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