CODEWITHSUNDEEP
dockerdockerfile
flywell
flywell

Reputation: 356

docker : do not override base image entrypoint

I want to have a docker image which extends mongo image and have ssh on it. I wrote this lines :

FROM mongo

RUN apt-get update && \
    apt-get install -y openssh-server

EXPOSE 22

RUN useradd -s /bin/bash -p $(openssl passwd -1 test) -d /home/nf2/ -m -G sudo test

CMD ["sh", "-c", "service ssh start", "bash"]

This starts only ssh and not mongo. If I remove the last line mongod is executed from the base image.

Any idea to run both commands in the same image ?

Upvotes: 3

Views: 2827

Answers (1)

Adiii
Adiii

Reputation: 60074

As mentioned by @David, CMD typically run one process so when you override this with service ssh start it will not run Mongo as it will overide base image CMD that run Mongo process.

Try to change CMD to start both processes.

CMD ["sh", "-c", "service ssh start && mongod"]

But you should know in this if service ssh stop due to some reason you container will still keep running and it will die once Mongo process stop. You can verify using below command

docker run  -dit --name test --rm abc && docker exec -it test bash -c "service ssh status"
ce30fa23eeb07f1e268008cce7566585ba1f98c0a3054cecb145443f3275a0d4
 * sshd is running

Update:

As mongod will only start Mongo process and no init DB will be happened so try to change your command for imitating DB.

FROM mongo
RUN apt-get update && \
    apt-get install -y openssh-server
ENV MONGO_INITDB_ROOT_USERNAME=root
ENV MONGO_INITDB_ROOT_PASSWORD=example
RUN useradd -s /bin/bash -p $(openssl passwd -1 test) -d /home/nf2/ -m -G 
CMD ["sh", "-c", "service ssh start && docker-entrypoint.sh mongod"]

Upvotes: 3

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