I am an hacker!

I have gone through this famous hacker checklist and I am positive: I am an hacker.


Next step: write it on my CV.

Popular posts

Mirth: recover space when mirthdb grows out of control

I was recently asked to recover a mirth instance whose embedded database had grown to fill all available space so this is just a note-to-self kind of post. Btw: the recovery, depending on db size and disk speed, is going to take long. The problem A 1.8 Mirth Connect instance was started, then forgotten (well neglected, actually). The user also forgot to setup pruning so the messages filled the embedded Derby database until it grew to fill all the available space on the disk. The SO is linux. The solution First of all: free some disk space so that the database can be started in embedded mode from the cli. You can also copy the whole mirth install to another server if you cannot free space. Depending on db size you will need a corresponding amount of space: in my case a 5GB db required around 2GB to start, process logs and then store the temp files during shrinking. Then open a shell as the user that mirth runs as (you're not running it as root, are you?) and cd in...
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Quasi-code with Apache Camel

Debating whether to go no-code but worried about unclear licensing, the dreadful we-need-to-rewrite-it dram down the road or django/rails/spring boot and its relatively higher upfront cost? There's a third way: quasi-code with Apache Camel . It still amazes me how few people know about the swiss-army knife of integrations.
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A not so short guide to ZFS on Linux

Updated Oct 16 2013: shadow copies, memory settings and links for further learning. Updated Nov 15 2013: shadow copies example, samba tuning. Unless you've been living under a rock you should have by now heard many stories about how awesome ZFS is and the many ways it can help with saving your bacon . The downside is that ZFS is not available (natively) for Linux because the CDDL license under which it is released is incompatible with the GPL. Assuming you are not interested in converting to one of the many Illumos distributions or FreeBSD this guide might serve you as a starting point if you are attracted  by ZFS features but are reluctant to try it out on production systems. Basically in this post I note down both the tought process and the actual commands for implementing a fileserver for a small office. The fileserver will run as a virtual machine in a large ESXi host and use ZFS as the filesystem for shared data.
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