Protect Sensitive Data in Docker

By  on  
Docker

Developing authentication code for open source repositories can be a scary task; you're scared that hackers can find loopholes in your code but you're also petrified of accidentally committing sensitive credentials to a public repository.  I've seen unintentional credential commits happen and the panic that ensues throughout an organization will make your eyes water.

The standard for providing sensitive credentials in a production environment is using environment variables.  Docker, via docker-compose and docker-compose.yml, easily allows developers to introduce environment variables and values, but you don't want to commit those to a repo, so the answer is creating a docker-compose.override.yml file on your local machine which contains the sensitive information:

version: '2'
services:
  myservice:
    environment:
      - KEY=Value
      - CLIENT_ID=ljlxjlkfj3298749sd98xzuv9z8x
      - CLIENT_SECRET=32xlkjwe9sd9x8jx9we8sd9sdad
      - SITE_DOMAIN=davidwalsh.local

The information in docker-compose.override.yml is added to (or overrides) the directives in docker-compose.yml.  Since git and mercurial will allow you to commit docker-compose.override.yml files, the other important step is adding your docker-compose.override.yml file to your .gitignore or .hgignore file, preventing the file from being seen from the two version control tools.

docker-compose.override.yml

Using docker-compose.override.yml and .gitignore is a simple idea but it's important to implement this technique as soon as possible.  Security is of the utmost importance, especially when your repository is public, and casually adding sensitive API data while developing will lead to problems.

Recent Features

  • By
    Creating Scrolling Parallax Effects with CSS

    Introduction For quite a long time now websites with the so called "parallax" effect have been really popular. In case you have not heard of this effect, it basically includes different layers of images that are moving in different directions or with different speed. This leads to a...

  • By
    CSS Animations Between Media Queries

    CSS animations are right up there with sliced bread. CSS animations are efficient because they can be hardware accelerated, they require no JavaScript overhead, and they are composed of very little CSS code. Quite often we add CSS transforms to elements via CSS during...

Incredible Demos

  • By
    prefers-color-scheme: CSS Media Query

    One device and app feature I've come to appreciate is the ability to change between light and dark modes. If you've ever done late night coding or reading, you know how amazing a dark theme can be for preventing eye strain and the headaches that result.

  • By
    Fade Images with MooTools LazyLoad

    I recently received an email from a MooTools developer asking a great question about my LazyLoad class: "I'm using your LazyLoad MooTools plugin (which is great, by the way). I have been trying to figure out how to modify it so that once an image scrolls into...

Discussion

  1. Hey, good trick. Another way of doing it is by using a .env file, supported since Docker Compose 1.7.0:

    https://docs.docker.com/compose/environment-variables/

    The use of .env files is quite widespread so should be familiar to a lot of people.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!