| title | category | prism_languages | updated | |
|---|---|---|---|---|
Dockerfile |
Devops |
|
2019-10-20 |
{: .-three-column}
FROM ruby:2.2.2
ENV APP_HOME /myapp
RUN mkdir $APP_HOME
ARG APP_HOME=""
RUN mkdir $APP_HOME
RUN bundle install
WORKDIR /myapp
VOLUME ["/data"]
# Specification for mount point
ADD file.xyz /file.xyz
COPY --chown=user:group host_file.xyz /path/container_file.xyz
ENV my_var
SHELL ["/bin/bash", "-euo", "pipefail", "-c"]
# With strict mode:
RUN false # fails build like using &&
RUN echo "$myvar" # will throw error due to typo
RUN true | false # will bail out of pipe
Using shell will turn on strict mode for shell commands.
ONBUILD RUN bundle install
# when used with another file
EXPOSE 5900
CMD ["bundle", "exec", "rails", "server"]
ENTRYPOINT ["executable", "param1", "param2"]
ENTRYPOINT command param1 param2
Configures a container that will run as an executable.
ENTRYPOINT exec top -b
This will use shell processing to substitute shell variables, and will ignore any CMD or docker run command line arguments.
LABEL version="1.0"
LABEL "com.example.vendor"="ACME Incorporated"
LABEL com.example.label-with-value="foo"
LABEL description="This text illustrates \
that label-values can span multiple lines."
{: .-one-column}