Category Archives: General

Short Tip: Install shellcheck on an outdated CentOS

Posted on 3. August 2016 by bastelfreak

I’ve to install shellcheck on a CentOS 7 box, this is the latest CentOS version. The tool is a great linter for bash scripts, which I want to integrate into our CI pipeline. shellcheck isn’t packaged so I will build … Continue reading →

Posted in General, Linux, Short Tips | 2 Comments

Short Tip: Installing msgpack on outdated boxes (ruby1.9.1)

Posted on 2. August 2016 by bastelfreak

I’m using msgpack to serialize the data between my puppet agents and the masters. Recently I had to puppetize an old Debian Wheezy box. I’ve to install msgpack in advance: # gem install msgpack Building native extensions. This could take … Continue reading →

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rubocop-rspec magic: Fixing RSpec/InstanceVariable

Posted on 10. July 2016 by bastelfreak

We recently introduced RSpec/InstanceVariable into our RuboCop configuration at Vox Pupuli. Using instance variables is not considered best practice so we are currently migrating away from them. Here is en example of the old code style: The variables are later … Continue reading →

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Diving into Management – How to do Meetings

Posted on 10. July 2016 by bastelfreak

In the past months I had the ability to lead small teams in various little projects (for a few days to weeks). This all happened in some open source projects and in my evening classes. I had a course about … Continue reading →

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Create a simple streaming replication for postgres with puppet

Posted on 4. June 2016 by bastelfreak

I need to build a postgres setup for a important database. The idea is to one master and one-many slaves that can serve read only access. The slaves will work in a hot-standby mode where they continuously receive data from … Continue reading →

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Create ssh keys with puppet on a server + pubkey exchange

Posted on 4. June 2016 by bastelfreak

There are a few solutions to generate ssh keys on a puppet master/server or copy them from hiera to a box. I have got several boxes and every box needs to have ssh access to every other box. I don’t … Continue reading →

Posted in General, IT-Security, Linux, Puppet | 1 Comment

Tuning glusterfs for dummies

Posted on 15. May 2016 by bastelfreak

I’m playing with gluster since a few weeks, here is a short tutorial for optimizations I did for a setup with many small files (1-5mb): First we checkout the startup time. Gluster by default offers NFS shares, but I don’t … Continue reading →

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Linux Short Tip: systemd-networkd and DNS servers

Posted on 14. May 2016 by bastelfreak

You maybe have noticed that you can configure DNS servers in your systemd-networkd settings, but these addresses don’t appear in /etc/resolv.conf. You need to enable/start systemd-resolved, this daemon checks global DNS settings in /etc/systemd/resolved.conf, DNS settings for each link from … Continue reading →

Posted in 30in30, General, Linux, Short Tips | 2 Comments

Short Tip: Replacing a failed drive in mdadm softwareraid

Posted on 13. May 2016 by bastelfreak

Sometimes you check your fileserver and your raid looks like this: # cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md125 : active (auto-read-only) raid6 sdl[1] sdh[7] sdf[5] sdk[2] sdg[6] sdm[8] sdi[0] sdn[10] sde[4] 23441080320 blocks super 1.2 level 6, … Continue reading →

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Doing IPv6 with systemd-networkd – the correct way

Posted on 13. May 2016 by bastelfreak

Understanding the docs: I blogged about IPv6 with systemd-networkd in Arch Linux step by step installation guide and provided a hacky workaround to get a working IPv6 address configured. I read through the docs again and hand a longer discussion … Continue reading →

Posted in 30in30, General, Internet found pieces, Linux | 1 Comment