Why can't /bin/bash be run in docker?

Question

Debian

Dockerfile is something like this (removed irrelevant data):

FROM debian:8.4
ENV DEBIAN_FRONTEND noninteractive
ENTRYPOINT ['/bin/bash' '-c']

Assembles normally. But at startup it gives out:
/bin/sh: 1: [/bin/bash: not found
Tried: change to /bin/sh, ENTRYPOINT to CMD, and many more different options ...
At the same time, docker run 'vendor/container' /bin/bash works fine.
CHADNT?

Answer 1

The way I solved this problem for myself. Does not claim to be correct. You need to copy the .sh file to the container and specify it as executable when the container starts.
Dockerfile:

COPY docker-entrypoint.sh /usr/local/bin/
RUN chmod 0755 /usr/local/bin/docker-entrypoint.sh
CMD ["/usr/local/bin/docker-entrypoint.sh"]

docker-entrypoint.sh
Now when you docker attach container_name you will get the bash of the container