Category Archives: Linux

Short Tip: Moving commits between branches

Posted on 11. January 2016 by bastelfreak

Sometimes you are developing on a huge new feature on a software project. If you are smart you do it in a separate (feature-) branch. During the development cycle you may modify existing code and after a few days you … Continue reading →

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32C3 Review Part 1

Posted on 29. December 2015 by bastelfreak

I visited the 32C3, the annual Hacker conference organized by the CCC and many many volunteers. Here is the first part of a short list of recommended videos (Day 1 of 4): Part1 – annual must-see talks: The Opening is … Continue reading →

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Link collection of the week

Posted on 11. December 2015 by bastelfreak

Another link collection with cool stuff from the past week: Turning the database inside out with Apache Samza How to do code reviews Why mongodb sucks Problems with SHA1 deprecation in SSL Certs Counterfeit of electronic components We Are All … Continue reading →

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Fiddling with duply and ed25519 keys

Posted on 8. December 2015 by bastelfreak

I’m using duply for my backups, the config is very simple (/root/.duply/backup/conf): GPG_KEY=’IDOFMYGPGKEY’ GPG_PW=’PASSWORD’ GPG_OPTS=’–compress-algo=bzip2′ TARGET=’sftp://user@storage01.server.de:22//user’ SOURCE=’/’ DUPL_PRECMD=”nice -n 20 ionice -c 3″ MAX_AGE=2M MAX_FULL_BACKUPS=8 MAX_FULLBKP_AGE=1W DUPL_PARAMS=”$DUPL_PARAMS –full-if-older-than $MAX_FULLBKP_AGE ” VOLSIZE=512 DUPL_PARAMS=”$DUPL_PARAMS –volsize $VOLSIZE ” VERBOSITY=4 DUPL_PARAMS=”$DUPL_PARAMS –asynchronous-upload ” I … Continue reading →

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Securing Postfix on a shared Webserver

Posted on 3. December 2015 by bastelfreak

I’m operating a webserver for shared webspace accounts. I’m not responsible for the stuff hosted on the webspace, but for the server itself. Many people like to host their wordpress or joomla on this server, both scripts are well known … Continue reading →

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Fighting PHP spam

Posted on 1. December 2015 by bastelfreak

A good friend owns a very old joomla website which has been hacked. It is massively sending spam, how can we investigate this? First of all, reject outgoing mails in your firewall (ferm.conf style): Now we have time to investigate. … Continue reading →

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Fiddling with MySQL

Posted on 30. November 2015 by bastelfreak

Let us have a look at a simple procedure in MySQL 5.6: Easy one. A note about variables. id1 is a local/user defined variable, the scope is limited to the BEGIN/END block, @id2 is a global variable, accessible from everywhere. … Continue reading →

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Zabbix Autodiscovery for KVM VM Images

Posted on 27. November 2015 by bastelfreak

A very short description about Zabbix: Zabbix Agent: Executes Checks on a system that you want to monitor (for example checking the avialable memory). Zabbix Server: Central part that receives values from the agents, serves the frontend with data, throws … Continue reading →

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Getting started with Hiera

Posted on 27. November 2015 by bastelfreak

I am using puppet since the end of 2012 and I finally found a use case for Hiera. This is my way of implementing it: What is Hiera Hiera is split into two parts: The backend is a key/value store … Continue reading →

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Extending Disk Capacity for KVM Virtual Machines

Posted on 26. November 2015 by bastelfreak

From time to time, your data grows and a virtual machine is getting filled up. Here is a short tutorial for extending the disk capacity for KVM machines on LVM2: First step: Poweroff the machine. This is a good situation … Continue reading →

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