Docker 容器使用 Docker 客户端 docker 客户端非常简单 ,我们可以直接输入 docker 命令来查看到 Docker 客户端的所有命令选项。 [root@huixuan ~]# docker Usage:  docker COMMAND A self-sufficient runtime for containers Options:       --config string      Location of client config files (default "/root/.docker")   -D, --debug              Enable debug mode       --help               Print usage   -H, --host list          Daemon socket(s) to connect to (default [])   -l, --log-level string   Set the logging level ("debug", "info", "warn", "error", "fatal") (default "info")       --tls                Use TLS; implied by --tlsverify       --tlscacert string   Trust certs signed only by this CA (default "/root/.docker/ca.pem")       --tlscert string     Path to TLS certificate file (default "/root/.docker/cert.pem")       --tlskey string      Path to TLS key file (default "/root/.docker/key.pem")       --tlsverify          Use TLS and verify the remote   -v, --version            Print version information and quit Management Commands:   container   Manage containers   image       Manage images   network     Manage networks   node        Manage Swarm nodes   plugin      Manage plugins   secret      Manage Docker secrets   service     Manage services   stack       Manage Docker stacks   swarm       Manage Swarm   system      Manage Docker   volume      Manage volumes 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 between a container and the local filesystem   create      Create a new container   diff        Inspect changes on a container's filesystem   events      Get real time events from the server   exec        Run a command in a running container   export      Export a container's filesystem as a tar archive   history     Show the history of an image   images      List images   import      Import the contents from a tarball to create a filesystem image   info        Display system-wide information   inspect     Return low-level information on Docker objects   kill        Kill one or more running containers   load        Load an image from a tar archive or STDIN   login       Log in to a Docker registry   logout      Log out from a Docker registry   logs        Fetch the logs of a container   pause       Pause all processes within one or more containers   port        List port mappings or a specific mapping for the container   ps          List containers   pull        Pull an image or a repository from a registry   push        Push an image or a repository to a registry   rename      Rename a container   restart     Restart one or more containers   rm          Remove one or more containers   rmi         Remove one or more images   run         Run a command in a new container   save        Save one or more images to a tar archive (streamed to STDOUT by default)   search      Search the Docker Hub for images   start       Start one or more stopped containers   stats       Display a live stream of container(s) resource usage statistics   stop        Stop one or more running containers   tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE   top         Display the running processes of a container   unpause     Unpause all processes within one or more containers   update      Update configuration of one or more containers   version     Show the Docker version information   wait        Block until one or more containers stop, then print their exit codes Run 'docker COMMAND --help' for more information on a command. [root@huixuan ~]#  可以通过命令 docker command --help 更深入的了解指定的 Docker 命令使用方法。 例如我们要查看 docker stats 指令的具体使用方法： [root@huixuan ~]# docker stats --help Usage:  docker stats [OPTIONS] [CONTAINER...] Display a live stream of container(s) resource usage statistics Options:   -a, --all             Show all containers (default shows just running)       --format string   Pretty-print images using a Go template       --help            Print usage       --no-stream       Disable streaming stats and only pull the first result [root@huixuan ~]#  运行一个web应用 前面我们运行的容器并没有一些什么特别的用处。 接下来让我们尝试使用 docker 构建一个 web 应用程序。 我们将在docker容器中运行一个 Python Flask 应用来运行一个web应用。 [root@huixuan ~]# docker pull training/webapp  # 载入镜像 Using default tag: latest Trying to pull repository docker.io/training/webapp ...  latest: Pulling from docker.io/training/webapp e190868d63f8: Pull complete  909cd34c6fd7: Pull complete  0b9bfabab7c1: Pull complete  a3ed95caeb02: Pull complete  10bbbc0fc0ff: Pull complete  fca59b508e9f: Pull complete  e7ae2541b15b: Pull complete  9dd97ef58ce9: Pull complete  a4c1b0cb7af7: Pull complete  Digest: sha256:06e9c1983bd6d5db5fba376ccd63bfa529e8d02f23d5079b8f74a616308fb11d Status: Downloaded newer image for docker.io/training/webapp:latest [root@huixuan ~]# docker run -d -P training/webapp python app.py e4fbb06d2dda11414252575dd77b2561b23e09c0237fac764076ba61fffa3461 [root@huixuan ~]#  参数说明: -d:让容器在后台运行。 -P:将容器内部使用的网络端口映射到我们使用的主机上。 查看 WEB 应用容器 使用 docker ps 来查看我们正在运行的容器 [root@huixuan ~]# docker ps CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                    NAMES e4fbb06d2dda        training/webapp     "python app.py"     37 seconds ago      Up 35 seconds       0.0.0.0:1024->5000/tcp   kickass_wright [root@huixuan ~]#  这里多了端口信息。 PORTS   0.0.0.0:1024->5000/tcp  Docker 开放了 5000 端口（默认 Python Flask 端口）映射到主机端口 32769 上。 这时我们可以通过浏览器访问WEB应用

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