如何在已经存在的Docker容器上运行命令？
我创建了一个包含 -d 的容器，所以它不是互动的。
I created a container with -d so it's not interactive.
docker run -d shykes/pybuilder bin/bash
我看到容器已经退出： / p>
I see that the container has exited:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d6c45e8cc5f0 shykes/pybuilder:latest "bin/bash" 41 minutes ago Exited (0) 2 seconds ago clever_bardeen
现在我想在机器上运行偶尔的命令并退出。只是为了得到回应。
Now I would like to run occasional commands on the machine and exit. Just to get the response.
我尝试启动机器。我试着附上我以为可以使用一个容器调用运行，但这似乎不允许。使用开始似乎运行然后快速存在。
I tried to start the machine. I tried attaching. I thought I could call run with a container, but that does not seem to be allowed. Using start just seems to run and then exist quickly.
我想要回到交互模式退出。
I'd like to get back into interactive mode after exiting.
我试过：
docker attach d6c45e8cc5f0
但是我得到：
2014/10/01 22:33:34 You cannot attach to a stopped container, start it first
但是如果我启动它，它会退出。抓住22.我不能赢。
But if I start it, it exits anyway. Catch 22. I can't win.
2014年10月，命令： https：//docs.docker。 com / engine / reference / commandline / exec /
In October 2014 the Docker team introduced docker exec command: https://docs.docker.com/engine/reference/commandline/exec/
所以现在你可以在运行的容器中运行任何命令，只要知道它的ID（或名称）：
So now you can run any command in a running container just knowing its ID (or name):
docker exec -it <container_id_or_name> echo "Hello from container!"
请注意， exec 运行容器如果容器当前已停止，则需要先运行以下命令：
Note that exec command works only on already running container. If the container is currently stopped, you need to first run it with the following command:
docker run -it -d shykes/pybuilder /bin/bash
这里最重要的是 -d 选项，代表分离。这意味着您最初提供给容器的命令（ / bin / bash ）将在后台运行，容器不会立即停止 。
The most important thing here is the -d option, which stands for detached. It means that the command you initially provided to the container (/bin/bash) will be run in the background and the container will not stop immediately.