Docker在启动时退出CMD [英] Docker exits CMD on start

问题描述

我有一个运行 play Web应用程序的docker映像.在dockerfile中，有CMD启动服务器，它等待直到您按Ctrl + D退出.如果我这样做:

I have a docker image that runs play web application. In dockerfile there is CMD which starts the server and it waits until you hit Ctrl+D to exit. If I do:

docker run -d  -i -v

它正常工作-启动服务器并等待ctrl + D.

It works correctly - starts the server and waits for ctrl+D.

但是，当我启动容器时情况并非如此:

This is however not the case when i start the container:

docker start -i

相反，服务器会自动停止:

Instead the server automatically stops:

--- (Running the application, auto-reloading is enabled) ---

[info] p.c.s.NettyServer - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Ctrl+D to stop and go back to the console...)


[success] Total time: 1 s, completed Jul 27, 2016 11:54:13 AM <--- this indicates that the server was stopped.

如何强制Docker启动不停止服务器?

How can I force docker start to not stop server?

推荐答案

泊坞窗容器在其主进程完成时退出.在不了解您的docker-file(我没有使用play框架的经验)的情况下，您需要确保至少有一个进程保持活动状态.

A docker container exits when its main process finishes. Without having an insight into your docker-file (I have no experience with the play framework), you need to make sure that at least one process stays alive.

您有两种选择:

• Docker Way
  尝试像docker run -it <your framework image> bash一样使用-it进入要启动的容器.这样可以使您的窗口保持打开状态，并允许您在容器中运行命令.
• Docker调试"方式
  尝试使用docker inspect <your container>(使用docker ps -a查找您的容器)命令来调查容器退出的原因.如果您有一个像start.sh这样的启动脚本，则可以尝试添加while true; do sleep 1000; done以使容器保持运行状态，以调查退出之前容器在做什么.
• 尝试使用已发布的docker映像之一，例如- https://hub. docker.com/r/ingensi/play-framework/

• Docker Way
  Try using -it like docker run -it <your framework image> bash to get into the container you are starting. This should keep your window open and allow you to run commands in the container.
• Docker "debug" way
  Try using the docker inspect <your container> (use docker ps -a to find your container) command to investigate why the container exited. In case you have a start script like start.sh you can try to add while true; do sleep 1000; done to keep the container up to investigate on what it was doing before it exited.
• Try using the one of the published docker images like - https://hub.docker.com/r/ingensi/play-framework/

P.S.我不能感到您是Docker新手，并且正在混用docker start和docker run命令.

P.S. I can not loose the feeling that you are new to docker and are mixing the docker start and the docker run command.

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