django - Why does CMD never work in my Dockerfiles? -


i have few dockerfiles cmd doesn't seem run. here example (all way @ bottom).

########################################################## # set base image ansible ubuntu:16.10  # install ansible, python , related deps # run apt-get -y update && \     apt-get install -y python-yaml python-jinja2 python-httplib2 python-keyczar python-paramiko python-setuptools python-pkg-resources git python-pip run mkdir /etc/ansible/ run echo '[local]\nlocalhost\n' > /etc/ansible/hosts run mkdir /opt/ansible/ run git clone http://github.com/ansible/ansible.git /opt/ansible/ansible workdir /opt/ansible/ansible run git submodule update --init env path /opt/ansible/ansible/bin:/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin env pythonpath /opt/ansible/ansible/lib env ansible_library /opt/ansible/ansible/library run apt-get update -y run apt-get install python -y run apt-get install python-dev -y run apt-get install python-setuptools -y run apt-get install python-pip  run mkdir /ansible/ workdir /ansible copy ./ansible ./ workdir /  run ansible-playbook -c local ansible/playbooks/installdjango.yml  env projectname testwebsite  ################## setup directory structure ######################  workdir /home  cmd ["django-admin" "startproject" "$projectname"] expose 8000

if build , run container, can manually run django-admin startproject $projectname , create new project expected, cmd in dockerfile not seem doing , happening other dockerfiles there's must not getting.

entrypoint , cmd defines default command docker runs when starts container, not when image built. when entrypoint isn't defined, run value of cmd. otherwise, cmd becomes args entrypoint. when run image, can override value of cmd passing args after container name.

so, in example above, cmd may defined anything, when run container docker run -it <imagename> /bin/bash, override value of cmd , replace /bin/bash. run defined value of cmd, need run container docker run <imagename>.


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