Best Practices / Tech Tips &Tricks’ Blogs

Monitoring DNS server synchronicity

code April 4th, 2011

We, along with some customers, have our authoritative DNS setup with 1 PowerDNS master(which is unreachable over the internet), running poweradmin, and 2 BIND9 slaves(which are ns1 and ns2). This setup works great, but there is a bug in (older versions of) PowerAdmin and one in BIND that together can cause some havoc.

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Facter facts for memory in bytes

code March 22nd, 2011

By default facter returns the free and total memory and swap of a machine only in GB or MB. To remedy this we rewrote the memory.rb bundled with Puppet to return the numbers in bytes.

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Failover without Hetzner addresses: the HostHenker

HostHenker March 18th, 2011

HostHenker is a small shell script, which based on whether a daemon is running, adds an entry to /etc/hosts for this host or a fallback host.

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HowTo: Reset a cryptostick

nitrokey February 21st, 2011

Resetting a cryptostick is possible after all!

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Puppet on puppetmaster, some tips

puppet January 26th, 2011

A couple of tips to keep in mind when running a puppetd on the puppetmaster.

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Puppet Tips&Tricks: Running apt-get update only when needed

puppet November 9th, 2010

How to only run apt-get update from puppet if it’s necessary. A small example on how you can make apt-get update only run if a) the machine rebooted and b) something changed in /etc/apt.

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Puppet Tips&Tricks: Variable variables

puppet September 1st, 2010

More Puppet Tips&Tricks in our new blog post: This time on Variable variables.

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Two-factor LUKS using Ubuntu

July 29th, 2010

How to secure your data with LUKS and OpenPGP smartcards using Ubuntu.

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