| title | slug | weight |
|---|---|---|
Dockerfile RUN |
Dockerfile-RUN |
12 |
The RUN command is the central executing directive for Dockerfiles. It takes a command as its argument and runs it to form the image. Unlike CMD, it actually is used to build the image (forming another layer on top of the previous one which is committed).
FROM ubuntu
RUN id
RUN useradd --create-home -m -s /bin/bash dev
# Add a fun prompt for dev user of my-app
# whale: "\xF0\x9F\x90\xB3"
# alien:"\xF0\x9F\x91\xBD"
# fish:"\xF0\x9F\x90\xA0"
# elephant:"\xF0\x9F\x91\xBD"
# moneybag:"\xF0\x9F\x92\xB0"
RUN echo 'PS1="\[$(tput bold)$(tput setaf 4)\]my-app $(echo -e "\xF0\x9F\x90\xB3") \[$(tput sgr0)\] [\\u@\\h]:\\W \\$ "' >> /home/dev/.bashrc && \
echo 'alias ls="ls --color=auto"' >> /home/dev/.bashrc
RUN mkdir /myvol
RUN echo "hello DQS Guide" > /myvol/greeting
RUN ["chmod", "664", "/myvol/greeting"]
RUN ["chown", "dev:dev", "/myvol/greeting"]
VOLUME /myvol
USER dev
RUN id
CMD ["/bin/bash"]
➜ docker build -t sangam14/run-dockerfile -f dockerfile.run .➜ Dockerfile git:(main) ✗ docker run -it sangam14/run-dockerfile my-app 🐳 [dev@0270ab5e6f0c]:/ $ ls
bin boot dev etc home lib media mnt myvol opt proc root run sbin srv sys tmp usr var
my-app 🐳 [dev@0270ab5e6f0c]:/ $ cat myvol/greeting
hello DQS Guide