Dockerfile: why doesn't the bash command work?

Question

I'd like to learn the Dockerfile from a very simple start, so here's my Dockfile:

FROM ubuntu
ENTRYPOINT /bin/bash

however, after building the image and run the container, I find that I can't run the bash commands. For example, if I type:

# clear

The container seems to get stuck running in an infinite loop. So why does that happen? How can I fix it?

Did you add a -it to your docker run command? docker run -it --rm --entrypoint /bin/bash ubuntu -c "clear" seems to work... — Paul Becotte
– Paul Becotte, Commented Sep 27, 2016 at 18:15
Please add the command that you used to run the container, and the output in your container's bash. — Haoming Zhang
– Haoming Zhang, Commented Sep 27, 2016 at 18:21

JesusTinoco · Accepted Answer · 2016-09-27 18:20:08Z

3

How are you running the container? Note that you have to pass the options -i in order to keep STDIN open and the -t to allocate a pseudo-TTY.

Below you can find an example:

docker run -i -t my-image

answered Sep 27, 2016 at 18:20

JesusTinoco

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1 Comment

Yeas, I forget to add -i while running the container! Thank you!

ManikantThakur · Accepted Answer · 2016-09-27 18:25:50Z

0

docker run -it ubuntu

Post this command, you will have a prompt like:

root@26f9e7a42517:/#

answered Sep 27, 2016 at 18:25

ManikantThakur

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