I want to give my root user in a (centos:6) Docker container a .bashrc. However, when I run my container, I find that the .bashrc has not been sourced. Can this be done?
My build command:
...
RUN touch .bashrc
RUN echo "iptables -t nat -A OUTPUT -d hostA -p tcp --dport 3306 -j DNAT --to hostB" >> .bashrc
...
My run command:
docker run -it --cap-add=NET_ADMIN myImage /bin/bash
Turns out I was adding the file incorrectly. It should be /root/.bashrc rather than just .bashrc. With the file added in the correct place, no run command or CMD is required.
Build
...
ADD iptables /iptables
RUN touch /root/.bashrc \
&& cat iptables >> /root/.bashrc
...
Run
docker run -it --cap-add=NET_ADMIN myImage /bin/bash
The bash manpage states that .bashrc is read when the shell is interactive. Thus, if you want a bash that reads .bashrc, you need to launch bash with -i.
See that:
root@host:~# echo 'echo this is .bashrc' > /tmp/bashrc
root@host:~# docker run -ti -v /tmp/bashrc:/root/.bashrc debian bash -i
this is .bashrc
root@01da3a7e9594:/#
But, executing bash -i like this in the container, overrides the entrypoint or cmd, so you might be better with wrapping the iptables command and the entrypoint you are originally using in a shell script that becomes your entrypoint / cmd.
