使用挂载卷创建后Docker容器未运行

Question

I am trying to use an image that I pulled from the docker database. However I need data from the host to use some programs loaded into the image. I created a container with this

sudo docker run --name="mdrap" -v "/home/ubuntu/profile/reads/SE:/usr/local/src/volume" sigenae/drap

it appears that everything works and then I start the container

sudo docker start mdrap

but when I check the running containers it is not listed there and if I try to load the container into /bin/bash it tells me the container is not running. I am a beginner with docker and am only trying to use an image to run programs with all the required dependencies, what am I doing wrong?

Answer 1

docker start is only to start a stopped container. It's not necessary after a docker run . (but more after a docker **create** , like in the documentation )

A container is started as long as it's main process is running.
As soon as the main process stops, the container stops.

The main process of a container can be either:

• the ENTRYPOINT if defined
• the CMD if no ENTRYPOINT and no command line argument
• the command line argument

In your case, as you don't have any command line argument (after the image name on the docker run command) and the image only defines a CMD (= /bin/bash ), your container is trying to start a /bin/bash .
But , as you don't launch the container with the --interactive/-i nor --tty/-t (again like in the documentation ), your process as nothing to interact with and stops (idem for each start of this container).

So your solution is simply to follow the documentation :

docker create --name drap --privileged -v /home/ubuntu/profile/reads/SE:/usr/local/src/volume -i -t sigenae/drap /bin/bash
docker start drap
docker exec -i -t drap /bin/bash

Or even simpler:

docker run --name drap --privileged -v /home/ubuntu/profile/reads/SE:/usr/local/src/volume -i -t sigenae/drap /bin/bash