WiFi at Deutsche Bahn + Ubuntu + Docker == trouble

Recently Deutsche Bahn started wifi for everyone travelling with a ICE. So far I had trips where it just worked great, on other trips I could not even connect – not on mobile phone nor on my laptop. Today it was different We have great signal strength, wifi on my phone works like a charm.… Continue reading WiFi at Deutsche Bahn + Ubuntu + Docker == trouble

Neo4j cluster and firewalls

This article summarizes the required and optional communication channels for a Neo4j enterprise cluster and provides some sample rules. For the firewall rules I’m using Ubuntu’s ufw package. As a sample setup we assume the following servers. All of them have 2 network interfaces, eth0 is for communication with outside world, eth1 is for cluster… Continue reading Neo4j cluster and firewalls

quick tooling tip for hacking Cypher statements – Linux only

When developing Cypher statements for a Neo4j based application there are multiple ways to do this. A lot of people (including myself) love the new Neo4j browser shipped with 2.0 and subsequent releases. This is a nicely built locally running web application running in your browser. At the top users can easily type their Cypher… Continue reading quick tooling tip for hacking Cypher statements – Linux only

running Neo4j graphgists locally with docker.io

Neo4j has a excellent tool for documenting graph models called graphgists. As the name suggests graphgists are typically stored as github gists in asciidoc format. Additionally to the regular asciidoc you can embed executable cypher and a Neo4j console in a graphgist. For most people it’s perfectly fine hosting their graphgists at github or dropbox.… Continue reading running Neo4j graphgists locally with docker.io

Gnome and CTI (computer-telephone-integration)

On my desk, there’s a Siemens Gigaset SX353 connected to the desktop PC via USB. There’s a nice command line tool for managing the telephone, esp. dialing numbers is possible using gigacontr –dev /dev/ttyGB0 –dial 1 <number> 10 Unfortunately when passing in a international number with the “+” notation, e.g. +49163123456 the phone will not… Continue reading Gnome and CTI (computer-telephone-integration)