hyginn

# Author: Boris Steipe (ORCID: 0000-0002-1134-6758)
# License: (c) Author (2019) + MIT
# Date: 2019-01-17

What are MD5 files good for anyway?

I recently contributed to Siegfried Köstlmeier's qrandom package and overlooked to update the package MD5 file. That got me thinking - these files are actually not mentioned in Writing R Extensions, and they are not mentioned in Hadley Wickham's R Packages either. We find them in the wild - but I did not find an explicit source regarding their format. In fact, there is a puzzled post from 2016 by Matthew Lueder on Stack Overflow "What is the MD5 file in R packages used for? How is it generated?" ... and the sole answer on the page misunderstood the question.

MichaelSimons

Retrieving Docker Image Sizes

There are two metrics that are important to consider when discussing the size of Docker images.

1. Compressed size - This is often referred to as the wire size. This affects how fast/slow images can be pulled from a registry. This impacts the first run experience on machines where images are not cached.
2. Uncompressed size - This is often referred to as the size on disk. This affects how much local storage is required to support your Docker workloads.

The example commands shown below will work on Windows, MacOS, and Linux.

How to Measure the Compressed Size