阿里云部署Docker(4)----容器的使用
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。