[xkcd.com](https://xkcd.com/349/)

Keeping Docker afloat - Best practices for patching and deprecating images

Intro One of the biggest benefits of Docker images is their immutability. Once they’re built, they don’t change. Built once, would work forever… That’s how nightmares of security guys starts 🤣 We have then two contradictory concepts: flowchart LR id1(Keep it stable) <---> id2(Keep is up to date and secure) For day to day work, usually first concept wins. You want your builds stable and try to avoid tempting distractions of upgrading log4j to latest version… Who knows what might break....

2024-02-09 · 7 min · timor

Tuning PipeWire for best audio quality on Ubuntu

TL;DR If you’re not interested in the “story of my life”, go directly to “Tuning PipeWire” section. I’m not an audiophile, but I spent whole days in the headphones and I like when sound sounds good. I like slight bass boost, which adds this kick to the melody, but won’t overwhelm me after an hour of listening. I like when high tones are clear, but I get annoyed if they’re too strong....

2024-01-28 · 8 min · timor
[Cloudflare](https://www.cloudflare.com)

Maximizing page performance and security with Cloudflare tuning

Info I use free tier of Cloudflare and all recommendations assume only those are available. Why to cache statically generated blog? My Blog is statically generated website served from Github Pages. As Github don’t allow to easily set my own domain (at least in free version), I needed some kind of proxy that: can serve page from my domain, will provide valid certificate for HTTPS. Info I know HTTPS for static site is a non-sense, but to keep it performant with HTTP/2 and HTTP/3 - you need it....

2024-01-11 · 8 min · timor
[Photo by RealToughCandy.com from Pexels](https://www.pexels.com/photo/a-person-holing-a-sticker-in-close-up-photography-11035380/)

The best way to get NVM working in CI/CD systems

TL;DR While reasoning is important, readers may not be interested in all the frustrations I experienced while figuring out how to get things done. If you’re looking for a quick solution, skip to the “What eventually worked?” section. However, if you’re interested in the thought process behind the solution, keep reading. Why? Some might bother why the hell I’d like to make my life so hard? 🤣 We used to use nodeenv for that purpose....

2023-04-25 · 10 min · timor
[Photo by Lu Li from Pexels](https://www.pexels.com/photo/men-in-horses-raising-cattles-8916937/)

Change configuration of Docker daemon in Rancher Desktop

I switched recently from Docker Desktop on my MacBook to Rancher Desktop. The most important reason for me to do it, was possibility to gently switch between docker and containerd runtimes. There’s still one feature that I miss on Rancher Desktop - possibility to change Docker daemon configuration. I used to enable experimental features1 and BuildKit2. Sadly, there’s no easy way to do it on Rancher… But there’s a magical way3....

2023-03-23 · 1 min · timor
[Photo by Ghasiq Anjum from Pexels](https://www.pexels.com/photo/metal-trash-bin-on-the-side-of-the-street-12841982/)

Best practices for writing Dockerfiles - Use VOLUME for all mutable, temporary file locations

IMO people don’t understand how VOLUME1 works so they don’t use it. It’s generally used far too rarely! In short VOLUME means two things: Whatever is left in directory marked as VOLUME, stays there and can’t be changed in later layers (actually it can be changed but changes won’t be persistent). Volumes are not part of layered image FS. They’re mounted as anonymous volumes located on standard file system. This means they’re working much faster....

2022-09-12 · 2 min · timor
[Photo by Tom Fisk from Pexels](https://www.pexels.com/photo/birds-eye-view-photo-of-freight-containers-2226458/)

Best practices for writing Dockerfiles - Use .dockerignore

People often complain, that building Docker image takes a long time. “I just added a single jar package” they say… Really? They often don’t remember that whole “build context”1 is uploaded to Docker daemon during build, which often means they’re not only adding “single jar”, but also all sources, test results and whatever they have in working directory. Solution is simple - to use .dockerignore file2. Syntax is similar to ....

2022-09-11 · 1 min · timor
[Photo by Tom Fisk from Pexels](https://www.pexels.com/photo/top-view-photography-of-cargo-ship-with-intermodal-containers-3057963/)

Dockerfile writing best practices

I’ve been thinking for a long time about writing set of articles on the topic of: “Dockerfile writing best practices”. As it’s often my daily job to prepare best in class containers, that are later used by thousands of company’s applications, I have quite good insights on the topic. Some experience and knowledge gathered is often against intuition and building it took me a while. I want to share it, with a hope that feedback I get will allow me to excel on the topic even further....

2022-09-10 · 2 min · timor

Ford S-MAX - kasowanie ostrzeżenia wymiany oleju

Auta się zmieniają a problemy z nimi pozostają te same :) Kasowanie ostrzeżenia wymiany oleju 1 Przekręcić kluczyk w stacyjce do drugiej pozycji, gdy zapalają się wszystkie kontrolki (nie uruchamiamy silnika). Wciskamy równocześnie pedały hamulca i gazu do oporu, trzymamy do zakończenia procesu. Pojawi komunikat o rozpoczęciu resetowania inspekcji. Możemy zatwierdzić OK. Czekamy aż pojawi się komunikat: Zatwierdzamy OK. Dopiero teraz zwalniamy pedały. https://forum.fordclubpolska.org/showthread.php?t=108532 ↩︎

2022-09-03 · 1 min · timor
[Photo by Markus Winkler from Pexels](https://www.pexels.com/photo/wood-dirty-rope-door-3828944/)

Creating fully encrypted ZFS pool

What I want to do? I use my pool to securely store backups, archive my old documents and keep huge family’s photo library. I have new disks. They were tortured with badblocks, so they’re ready to create ZFS pool. I’ve read few documents about different approaches 1 2 3. I wanted to be sure if anything changed during past years. One of articles recommends mirroring over RAIDZ. Resilvering is faster, at the same time putting IO less stress on whole pool....

2021-11-22 · 5 min · timor