How to extend an existing docker image?

Question

I\'m using the official elasticsearch Docker image instead of setting up my own elastic search instance. And that works great, up to the point when I wanted to extend it. I

Answer 1

If you don't mind using docker-compose, what I usually do is to add a first section for the base image you plan to reuse, and then use that image as the base in the rest of the services' Dockerfiles, something along the lines of:

---
version: '2'
services:
    base:
        build: ./images/base

    collector:
         build: ./images/collector

Then, in images/collector/Dockerfile, and since my project is called webtrack, I'd type

FROM webtrack_base
...

And now it's done!