It is rare case, but sometimes I have to configure base image by command argument while executing docker build. For example, there are two AWS account, and I use base image contained in each ECR (Elastic Container Registry) for each account. Even I have two base image, but I should use only one Dockerfile. In this case, this solution help me.
- Dockerfile
ARG BASE_IMAGE
FROM ${BASE_IMAGE}:latest
RUN hogehoge
- Command
$ docker build --build-arg BASE_IMAGE=XXXXXXXX.dkr.ecr.ap-northeast-1.amazonaws.com/baseimage .
ARG is the only instruction that we can use before FROM