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Category: linux

Ansible-cmdb v1.17: Generate a host overview of Ansible facts.

I've just released ansible-cmdb v1.17. Ansible-cmdb takes the output of Ansible's fact gathering and converts it into a static HTML overview page containing system configuration information. It supports multiple templates (fancy html, txt, markdown, json and sql) and extending information gathered by Ansible with custom data. This release includes the following bugfixes;: A bug that caused whitespace to be […]

Disable "New release available" emails on Ubuntu

We have our Ubuntu machines set up to mail us the output of cron jobs like so: $ cat /etc/crontab SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin MAILTO=admin@example.com # m h dom mon dow user command This is encrible useful, since cronjobs should never output anything unless something is wrong. Unfortunately, this means we also get emails like this: /etc/cron.weekly/update-notifier-common: […]

cfgtrack: A simpel tool that tracks and reports diffs in files between invocations.

Sometimes other people change configurations on machines that I help administer. Unfortunately, I wouldn't know when they changed something or what they changed. There are many tools available to track configuration changes, but most are way overpowered. As a result they require too much time to set up and configure properly. All I want is […]

Alien Deb to RPM convert fails with error: "Use of uninitialized value in split…" [FIXED]

TL;DR: Run alien under the script tool. I was trying to get my build server to build packages for one of my projects. One step involves converting a Debian package to a RPM by means of the Alien tool. Unfortunately it failed with the following error: alien -r -g ansible-cmdb-9.99.deb Warning: alien is not running as root! […]

Terrible Virtualbox disk performance

For a while I've noticed that Virtualbox has terrible performance when install Debian / Ubuntu packages. A little top, iotop and atop research later, and it turns out the culprit is the disk I/O, which is just ludicrously slow. The cause is the fact that Virtualbox doesn't have "Use host IO cache" turned on by […]

mdpreview, a Markdown previewer to be used with an external editor

There are many Markdown previewers out there, from the simplest commandline tool + webbrowser to full-fledged Markdown IDE's. I've tried quite a few, and I like none of them. I write my Markdown in an external editor (Vim), something very few Markdown previewers take in account. The ones that do are buggy. So I wrote mdpreview, […]

Openvas v8 on Ubuntu 14.04: Login failed. OMP service is down

Recently I suddently couldn't log into Openvas v8 running on Ubuntu 14.04 anymore. Nothing had changed about the machine (as far as I knew), but I got the following message when trying to log in with any account: Login failed. OMP service is down The logs (/var/log/openvas/openvasmd.log) showed the following message: lib serv:WARNING:2016-01-19 15h52.12 utc:21760: […]

Introducing ScriptForm: Stand-alone webserver that generates forms to serve as frontends to scripts

I've just releases v1.0 of ScriptForm. ScriptForm is a stand-alone webserver that automatically generates forms from JSON to serve as frontends to scripts. It takes a JSON file which contains form definitions, constructs web forms from this JSON and serves these to users over HTTP. The user can select a form and fill it out. When […]

Interesting links: October 4th 2015

Here's a bunch of links I found interesting in the last few weeks: List of Python Report Generation Tools jstat – Java Virtual Machine Statistics Monitoring Tool How To Protect WordPress with Fail2Ban on Ubuntu 14.04 | DigitalOcean Shiny Turn your analyses into interactive web applicationsNo HTML, CSS, or JavaScript knowledge required logtail(8) – Linux […]

Batch create new users on Linux

A while ago I had to create many new users on a Linux machine. Since I'm lazy, I opted to automate this process. The newusers command combined with pwgen (to generate new passwords) was the solution. First I installed pwgen, a utility to automatically generate passwords: $ sudo apt-get install pwgen I created a file […]