Stop docker when run command returns error code?

Question

How do you tell Docker to stop executing a Dockefile when one of its RUN commands returns an error code?

I have a Dockerfile like:

FROM ubuntu:18.04
RUN apt install -yq `cat requirements.txt | tr "\\n" " "`
RUN ./some_other_setup.sh
RUN ./my_tests.sh

and occasionally the apt install will fail if there's a brief network outage. However, the Docker will continue executing the other RUN commands, even though they too will fail because they depend on the apt install succeeding.

Answer 1

If you want to catch error and stop you can do like linux script

RUN set -e && apt install -yq `cat requirements.txt | tr "\\n" " "`

so set -e will catch all errors and stop if any happened.

OR

you can prevent failing apt install by adding RUN apt-get install -f which will install missing dependencies.

Also if apt-get/apt install has any errors you can do

apt-get install [your stuff] || true

which will always pass even with errors and then you do apt-get install -f so you always have all dependencies needed