Dockerfile Conditions

Reference

https://stackoverflow.com/questions/43654656/dockerfile-if-else-condition-with-external-arguments

If else conditions can be created in Dockerfile in order to create different builds for example depending on the build arguments that are passed in.

Example

ARG my_arg

FROM centos:7 AS base
RUN echo "do stuff with the centos image"

FROM base AS branch-version-1
RUN echo "this is the stage that sets VAR=TRUE"
ENV VAR=TRUE

FROM base AS branch-version-2
RUN echo "this is the stage that sets VAR=FALSE"
ENV VAR=FALSE

FROM branch-version-${my_arg} AS final
RUN echo "VAR is equal to ${VAR}"