通过上一节的学习，我们知道怎样执行docker容器，我们执行了一个普通的，一个后台的，我们还学习了几个指令：

docker ps - Lists containers.

docker logs - Shows us the standard output of a container.

docker stop - Stops running containers.

我们还能够查看下docker的版本号：

root@iZ28ikebrg6Z:~# docker version

Client version: 1.2.0

Client API version: 1.14

Go version (client): go1.3.1

Git commit (client): fa7b24f

OS/Arch (client): linux/amd64

Server version: 1.2.0

Server API version: 1.14

Go version (server): go1.3.1

Git commit (server): fa7b24f

root@iZ28ikebrg6Z:~# 

docker是基于google公司的Go语言的。

假设不知道docker怎么用，或者忘记了的时候，直接输入docker。会给出使用方法提示

root@iZ28ikebrg6Z:~# docker

Usage: docker [OPTIONS] COMMAND [arg...]

 -H=[unix:///var/run/docker.sock]: tcp://host:port to bind/connect to or unix://path/to/socket to use

A self-sufficient runtime for linux containers.

Commands:

    attach    Attach to a running container

    build     Build an image from a Dockerfile

    commit    Create a new image from a container's changes

    cp        Copy files/folders from a container's filesystem to the host path

    diff      Inspect changes on a container's filesystem

    events    Get real time events from the server

    export    Stream the contents of a container as a tar archive

    history   Show the history of an image

    images    List images

    import    Create a new filesystem image from the contents of a tarball

    info      Display system-wide information

    inspect   Return low-level information on a container

    kill      Kill a running container

    load      Load an image from a tar archive

    login     Register or log in to a Docker registry server

    logout    Log out from a Docker registry server

    logs      Fetch the logs of a container

    port      Lookup the public-facing port that is NAT-ed to PRIVATE_PORT

    pause     Pause all processes within a container

    ps        List containers

    pull      Pull an image or a repository from a Docker registry server

    push      Push an image or a repository to a Docker registry server

    restart   Restart a running container

    rm        Remove one or more containers

    rmi       Remove one or more images

    run       Run a command in a new container

    save      Save an image to a tar archive

    search    Search for an image on the Docker Hub

    start     Start a stopped container

    stop      Stop a running container

    tag       Tag an image into a repository

    top       Lookup the running processes of a container

    unpause   Unpause a paused container

    version   Show the Docker version information

    wait      Block until a container stops, then print its exit code

root@iZ28ikebrg6Z:~# 

docker后面跟指令，

root@iZ28ikebrg6Z:~# docker attach

Usage: docker attach [OPTIONS] CONTAINER

Attach to a running container

  --no-stdin=false    Do not attach STDIN

  --sig-proxy=true    Proxy all received signals to the process (even in non-TTY mode). SIGCHLD, SIGKILL, and SIGSTOP are not proxied.

root@iZ28ikebrg6Z:~# 

假设输入非法，总是会给出提示，告诉你怎么用。

Running a Web Application in Docker

利用Docker构建一个web程序

我们运行一个web应用。

root@iZ28ikebrg6Z:~# docker run -d -P training/weapp python app.py

Unable to find image 'training/weapp' locally

Pulling repository training/weapp

2014/10/16 11:01:56 Error: image training/weapp not found

root@iZ28ikebrg6Z:~# docker run -d -P training/webapp python app.py

Unable to find image 'training/webapp' locally

Pulling repository training/webapp

31fa814ba25a: Pulling dependent layers

511136ea3c5a: Download complete

f10ebce2c0e1: Download complete

82cdea7ab5b5: Download complete

5dbd9cb5a02f: Download complete

31fa814ba25a: Download complete

64523f641a05: Download complete

0e2afc9aad6e: Download complete

e8fc7643ceb1: Download complete

733b0e3dbcee: Download complete

a1feb043c441: Download complete

e12923494f6a: Download complete

a15f98c46748: Download complete

09792841c0b448a330a89ee656b4a16605d835f9d43bb7d6f80f204b6e8ed5b2

root@iZ28ikebrg6Z:~# docker ps

CONTAINER ID        IMAGE                    COMMAND             CREATED             STATUS              PORTS                     NAMES

09792841c0b4        training/webapp:latest   "python app.py"     54 minutes ago      Up 54 minutes       0.0.0.0:49153->5000/tcp   compassionate_torvalds

root@iZ28ikebrg6Z:~# docker ps

CONTAINER ID        IMAGE                    COMMAND             CREATED             STATUS              PORTS                     NAMES

09792841c0b4        training/webapp:latest   "python app.py"     56 minutes ago      Up 56 minutes       0.0.0.0:49153->5000/tcp   compassionate_torvalds

root@iZ28ikebrg6Z:~# 

第一次敲错了。第二次它会去docker库下载，下载完了，ps查看一下。多了一行Ports。

表示将本机的49153port映射到compassionate_toralds容器的5000port。

我用浏览器试一下。-d选项。我们已经讲过，是将程序后台化。-P，大写的P，是让docker来指定一个port映射。

这里是49153,你能够通过-p小写的来指定这样的映射关系。

例如以下效果：

好，能够訪问。

哈哈。

root@iZ28ikebrg6Z:~# docker run -d -p 5000:5000 training/webapp python app.py

aa47ba8e71c8512f228a96bf80da117b6c86fc03bdb17eef1c2db353a3e18493

好。再訪问一下。

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