“docker exec”和“docker start”无法找到容器

Question

I'm new to docker and created an image from a repository that includes a " dockerfile ". The build process ended successfully generating an image ID of 295e7c040cc2. When I try to run " docker exec -it 295e7c040cc2 /bin/bash ", I get an error:

Error: No such container: 295e7c040cc2

Running "docker images" shows that the image exists.

Why is this happening?

Answer 1

You need to run your image

docker run -it --entrypoint=/bin/bash 295e7c040cc2 

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docker run is a wrapper for docker create and docker start and instantiates a new container from your image and starts it for you.

docker exec , on the other hand, executes the specified code in a running container.

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More info can be found here

• https://docs.docker.com/engine/reference/commandline/run/
• https://docs.docker.com/engine/reference/commandline/exec/

Answer 2

295e7c040cc2 is docker image ID , it's not container ID. First create container from docker image.

More reference:

• https://docs.docker.com/engine/reference/commandline/run/

• https://docs.docker.com/engine/reference/commandline/exec/