First8 staat voor vakmanschap. Al onze collega’s zijn een groot aanhanger van Open Source en in het bijzonder het Java-platform. Wij zijn gespecialiseerd in het pragmatisch ontwikkelen van bedrijfskritische Java toepassingen waarbij integratie van systemen, hoge eisen aan beveiliging en veel transacties een belangrijke rol spelen. Op deze pagina vind je onze blogs.
tools

How to change password manager safely using linux

This is a quick how to on migrating your passwords from one password manager to another. This typically requires that you export all your credentials to plain text in XML or CSV, so that the other password manager can import it. Finding safe locations The ssd or harddisk is a risky location: you may forget to remove the file. Also, when … Lees verder How to change password manager safely using linux

1 Quick tip about security questions

You know the drill: you create an account somewhere, and you need to fill in the questions: “Where did you meet your SO?”, “What is your mothers maiden name?” etc. When answered truthfully, these can be guessed. My quick tip for those: In your password manager, there is almost always a “notes” section. Copy-paste the question in the notes. Generate … Lees verder 1 Quick tip about security questions

Remove all docker containers, images, volumes and networks

The motto nowadays seems to be: storage is cheap! Still, in order to keep the disk space usage down, as a developer I like to remove everything docker on my machine except for the engine. In operations, servers have to run years and housekeeping is mandatory. Remove docker state… all of it! Containers, images, volumes, networks

  Where is all … Lees verder Remove all docker containers, images, volumes and networks

tools

3 Essential unix tools to troubleshoot java

Ofcourse java developers and certainly unix administrators know commands like uptime, ps, top etc. Here are a few tools to help you drill down to the core of the problem when Java gets in trouble on a unix environment. The case In an actual production situation, a java process used a LOT of IO-time, seemed to hang (no logging output), … Lees verder 3 Essential unix tools to troubleshoot java

tools

Do not remove: /tmp/hsperfdata_$user

…or why java is running fine, but jps doesn’t show it…   A framework on a live system threw errors in a subdirectory of /tmp/hsperfdata_$user/… after which the /tmp/-space got full. Thinking “ah, only temp data, let’s just remove it“, I removed all of /tmp/hsperfdata_$user , only to be a little amazed a short while later… Suddenly,  jps did not … Lees verder Do not remove: /tmp/hsperfdata_$user

Migration scenario to a safer password store

Previously, we posted a blogpost about hashed password storage. In our most recent First8 friday videoblog, I presented this strategy. If we have hashed passwords based on a fast algorithm, this post presents a strategy to migrate to slow hashing, as graceful as possible. Until the last possible moment we defer switching over completely. A strategy that can be applied … Lees verder Migration scenario to a safer password store

Een persoonlijke geschiedenis met security

Deze maanden vertellen we in de First8 Friday video’s “iets” over security. Dit is een heel breed onderwerp, dus voor de filmpjes is er voor een flinke beperking gekozen. In een blogpost is meer ruimte, dus vandaar hier een persoonlijke geschiedenis van ruim 20 jaar interesse in computerbeveiliging. Opa Merijn vertelt. …hoe deed ze dat, waar kwamen de gegevens vandaan, … Lees verder Een persoonlijke geschiedenis met security