Category: linux

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 […]

Auto-mount external USB disk on a server

Althought modern Linux desktops generally automatically mount external USB disks when plugged in, servers usually don’t do this. When I replaced my home server desktop model with a Raspberry Pi 2 (running Raspbian), I wanted it to automatically mount USB drives and, more importantly, make the same USB drive available at the same path at […]

Ansible-cmdb v1.4: a host overview generator for ansible-managed hosts

Ansible-cmdb takes the output of Ansible’s setup module and converts it into a static HTML overview page containing system configuration information. It supports multiple templates and extending information gathered by Ansible with custom data. You can visit the Github repo, or view an example output here. This is the v1.4 release of ansible-cmdb, which brings a bunch of bug […]

Introducing ansible-cmdb: a host overview generator for ansible-managed hosts

For those of you that are using Ansible to manage hosts, you may have noticed you can use the setup module to gather facts about the hosts in your inventory: $ ansible -m setup –tree out/ all $ ls out centos.dev.local eek.electricmonk.nl zoltar.electricmonk.nl debian.dev.local jib.electricmonk.nl $ head out/debian.dev.local  {     “ansible_facts”: {     […]

Openvaz: Creating credentials is very slow [FIXED]

When creating new credentials on Openvaz (6, 7 and 8), it takes a very long time to store the credentials. The problem here is that the credentials are stored encrypted, and Openvaz (probably) has to generate a PGP key. This requires lots of random entropy, which is generally not abundantly available on a virtual machine. […]

SSH ChrootDirectory / sftponly not working [FIXED]

I was trying to setup a jail for SSH on Ubuntu 14.04, but it didn’t seem to work. The user I was trying to jail using ChrootDirectory could login with SFTP, but could still see everything. Turns out there were a few issues that were causing this. The summary is: All directories to the ChrootDirectory […]

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