docker best practices

summary.txt

## Incremental build time
#### Order your steps from least to most frequently changing steps to optimize caching

#### When copying files into your image, make sure you are very specific about what you want to copy. Any changes to the files being copied will break the cache

#### You always want to update the index and install packages in the same RUN: they form together one cacheable unit. Otherwise you risk installing outdated packages.

## Reduce image size
#### Apt has the –no-install-recommends flag which ensures that dependencies that were not actually needed are not installed

#### Remove the cache in the same RUN instruction that installed packages

## Maintainbility
#### Do not use the latest tag and use specific tag
#### Look for minimal flavors

## Reproducibility
#### Multi-build

https://www.docker.com/blog/intro-guide-to-dockerfile-best-practices/