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This is my docker file:

FROM ubuntu:16.04

RUN apt-get update --fix-missing && apt-get install -y emacs npm git nodejs

RUN rm -rf  .emacs .emacs.d
RUN git clone https://github.com/syl20bnr/spacemacs ~/.emacs.d

RUN ln -s /usr/bin/nodejs /usr/bin/node

RUN npm install && npm install -g yarn

I tried to start it in daemon mode so I can attach to the process later on

docker run -d spacemacs bash

But it fails to stay resident

CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS                      PORTS               NAMES
d4f867eb78f1        spacemacs                 "bash"              3 minutes ago       Exited (0) 3 minutes ago                        loving_turing

Why it is the case? I have run other container in daemon mode before.

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docker run -d spacemacs bash

You ran the command bash with no input, so it exited. The same happens if you do this on a normal linux prompt:

$ bash </dev/null
$ echo $?
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If you want to later attach to a running bash shell, you can tell docker that the command is interactive so that it keeps stdin open. I'd also recommend allocating a tty:

docker run -dit spacemacs bash

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