22 Mar 2020 | categories: [ data ] tags: [ R viz ]

Introduction In the frame of the Hackaviz2020 organized by the ToulouseDataViz, I had to work on displaying weekends on a plot. And, this is not so easy for a novice … During this Hackaviz I've also discovered the Tidy dataframes for Time series called tsibble and its associated universe of Tidy tools for time series, tidyverts—many thanks to my teammate for this tip.…

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. Squash newly built layers into a single new layer In order to illustrate the impact I have chosen a simple example that has room to be improved by squashing layers.…

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.” Even though you are executing the docker command line tool without root, the docker daemon is executing those requests as root on your behalf […]…

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. First try A simple descriptor to deploy the container. # zombie-init.yml apiVersion: v1 kind: Pod metadata: name: zombie-init spec: containers: - name: zombie-init image: zombie-init:latest imagePullPolicy: Never $ k create -f zombie-init.…

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. He talks about another—quite old—book on management called Becoming a Technical Leader 2. In this book, the author, Gerald Weinberg tells a story about improving the high score at the pinball game.…

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.x. As suggested by a user, the Extension fields capability added in the version 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. If you are a team leader or just a team member your team should be in one of these three 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). To deprecate an object simply make a call to the .Deprecated() function.…

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. I came across this tool called Radian with this attractive tagline. A 21 century R console So let's try it!…