Building and consuming JSON API with Crystal

When I firstly heard about Crystal language, I got really exited. It fixes exactly four problems I sometimes have with Ruby; types, speed, memory consumption and compilation to machine code. After many months silently following its development I decided to try it out for a simple program I need — a simple server standing between Google Maps API and my application to catch the geocoding responses in local Redis instance not to hit the limit imposed on using the service (plus, Google suggests you to do it anyway). Continue reading

What to do if Vagrant machine becomes unresponsive (KVM)

If you are using Vagrant with KVM (with vagrant-libvirt plugin) on Fedora, you might have experienced that sometimes the KVM virtual machine becomes unresponsive. Simply put you would wait forever for trying to ssh to the machine using vagrant ssh. It unfortunately happens to me sometimes when my laptop goes to sleep. So the simple answer is to avoid this and to always halt your Vagrant VMs when you finished working. Here is another thing to try out if you that happens and you don’t want to recreate the machine from scratch (vagrant destroy && vagrant up). Continue reading

DNS for your Vagrant needs: with Landrush, libvirt and dnsmasq

Have you ever needed a DNS server that would be visible both on your host and your Vagrant guests? Landrush is one of those things that can pretty much save you. Unfortunately it was designed around VirtualBox and Mac OS, so it does not work on Linux out-of-the-box. And it does not work with libvirt provider at all. Until of course recently since I added the support there. Here is how to make all that work together on Fedora. Continue reading