Simple Dockerfile examples are often broken by default

Re:Simple Dockerfile examples are often broken by default by itamarst on Tuesday May 28, 2019 @01:26PM (#20032273)

This issue isn't Docker, Docker itself obviously can't deal with this. The issue is the examples and tutorial people provide on Docker packaging often don't talk about the requirements (pun intended) for reproducible builds at all.

Or they don't talk about need to run as not-root.

Or they suggest base images that are often broken in subtle ways (Alpine Linux).

Or they talk about multi-stage builds for small images, and neglect to explain that you've just destroyed your caching (this is fixable, but you need to know to expect it and how to fix it.)

Etc.

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Re:Simple Dockerfile examples are often broken by default by batbomb on Tuesday May 28, 2019 @07:13PM (#20035333)

The caching part is (mostly) generally fixable by making sure to always add your source code in two stages - dependency files first, then resolve dependencies, and the rest of the source code later.

Rarely is this done though. And definitely alpine+musl doesn't always do what you might expect, and it's often language dependent as to whether or not you'll encounter something strange (not to mention you forfeiting bash)

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