Rzymek.github.io Website Review

Excel and ZIP64 - rzymek's rumblings

dive into ZIP file format in the context of .xlsx

Excel and ZIP64

dive into ZIP file format in the context of .xlsx

Zip file structure

Simplest Docker service - rzymek's rumblings

The Simplest Docker service My first thought when wanting to run a docker container as a system service, was to use docker service. Like this docker service create --name nginx -p 80:80 --mount type=bind,source=/var/www,destination=/usr/share/nginx/html nginx But this is sometimes an overkill. In case on nginx a much simpler solution would bedocker run --detach --network host --restart=always -v /var/www:/usr/share/nginx/html:ro nginx It’s the way to go, when you just what to have one instance on one specific host.

Simplest Docker service

Prevent docker from filling up your disk - rzymek's rumblings

Deploying docker container as part of your continuous integration can cause your disk to fill up pretty quick. Docker does reuse the layers that did not change between deployments. But still, that last layer with you .war or .js bundle can take a few hundred megabytes. Taking into account, that you should be deploying a new version of every update of the master branch, this can take up a gigabyte every day.

Prevent docker from filling up your disk

Automatic cleaning

Optional logging

What's so special about docker? - rzymek's rumblings

What’s so special about docker? There are quite a few comparisons between docker containers and virtual machines on the interwebs. That’s exactly what made it more difficult for me to understand what containers actually are. Then I came across the thought that docker is like chroot on steroids. That’s it! It’s just an isolated process. Not only on the filesystem level, but also all other resources like network and processes.

What's so special about docker?

It’s an old idea actually…

Spring Data repository with empty IN clause. - rzymek's rumblings

The problem I’ve stabled upon started with a spring data repository like this:public interface SampleRepository extends CrudRepository{ @Query(select s from Sample s where s.id in :ids) List queryIn(@Param(ids) List ids); } Actual query was of course more complicated that this. Complex enough to justify not using a query method. The problem emerges when you run this method with an empty collection as argument:repository.queryIn(Collections.emptyList()); The result is database dependent.

Spring Data repository with empty IN clause.

Select all on empty IN