15 Feb 2020 | categories: [ ops ] tags: [ docker ]

I was wondering the effect of merging layers (squashing) on the size of an image. Now Docker provides an experimental --squash option for the build.…

09 Feb 2020 | categories: [ ops ] tags: [ docker ]

You might be saying to yourself, “but I have rootless containers right now with Docker - I run my docker commands as a regular user and it works all the time.…

06 Feb 2020 | categories: [ ops ] tags: [ docker kubernetes ]

After my previous article on zombie processes I was curious to see if and how they can affect containers running in a Kubernetes (K8S) cluster.…

03 Feb 2020 | categories: [ ops ] tags: [ docker ]

Zombie processes, a short definition The first step is an orphaned process, a process that has lost his parent. Suppose the parent process terminates, either intentionally (because the program logic has determined that it should exit), or caused by a user action (e.…

27 Jan 2020 | categories: [ book ] tags: [ method ]

The pinball metaphor Another interesting thing in the book Elastic Leadership 1 by Roy Osherove. It's more an anecdote, however the analogy is funny.…

26 Jan 2020 | categories: [ ops ] tags: [ docker ]

Recently I answered to a question on Stack Overflow: How to use multiple image tags with docker-compose? The validated answer was based on extends, but it cannot by used anymore in Compose file format 3.…

25 Jan 2020 | categories: [ book ] tags: [ method ]

Three phases In his book Elastic Leadership 1, Roy Osherove talks about an interesting principle he call the Three team phases.…

20 Jan 2020 | categories: [ dev ] tags: [ R ]

After my recent article on marking deprecated code in Python, I had to do the same thing in R. It's included in the language (in The R Base Package).…

19 Jan 2020 | categories: [ ops ] tags: [ docker ]

Introduction Among its catalog of Universal Base Images (UBI), Red Hat provides a kind / flavor prefixed init. The UBI ubi8-init images contains the systemd initialization system, making them useful for building images in which you want to run systemd services, such as a web server or file server.…

17 Jan 2020 | categories: [ dev ] tags: [ python ]

It's always a good practice to deprecate functions, methods or classes before removing or changing something. Features are deprecated rather than immediately removed, to provide backward compatibility, and to give programmers time to bring affected code into compliance with the new standard.…

08 Jan 2020 | categories: [ data ] tags: [ r ]

I'm a big fan of console tools, and I was wondering if there was a way to color the R console output.…

06 Jan 2020 | categories: [ data ] tags: [ r ]

R packages have often funny names. littler stands for little R, this means lower case r. littler provides the r program, a simplified command-line interface for GNU R.…