We should all strive to handle all possible errors in our programs and display nice error messages to the users, but one can hardly be sure that nothing will ever go wrong. That’s why I believe we should try to embed a debug mode that users can take advantage of when submitting the issue or solving the problem. Luckily this is very simple thing to do. Continue reading
PDF should be this nice universal format that many government institution now work with. But what if they require you to fill in XFA forms inside their template PDFs? The ones I need to fill for my insurance company are certainly not supported in the standard Document Viewer shipped with Fedora. This weekend I tried installing Master PDF Editor and guess what? It works like a charm for me. They even offer various RPM builds for CentOS 6/7. And they work on my Fedora out of the box. Lucky me. Thanks a lot for this!
letsencrypt.org is the new awesomeness that happened to SSL on the web. Forget over-priced trusted certificates or self-signed certs for your side & pro bono projects. Try trusted SSL in seconds for free instead :). If you choose to use Let’s Encrypt I want to show you what needs to be done on a pretty average Fedora VPS with NGINX server and how to avoid certbot errors like urn:acme:error:unauthorized and urn:acme:error:unknownHost. Continue reading
Chances are you might need to run wkhtmltopdf on your server or in Vagrant environment (e.g. to overcome compatibility issue such as
Cannot mix incompatible Qt library (version 0x50700) with this library (version 0x50701)). That way you need to be able to run it without an actual X server. Continue reading
This is a little thought on packaged Ruby versions (mostly in Linux-based systems) and why I don’t get many people advising newcomers to start by installing RVM when in reality they just want to program Ruby. Continue reading
If you are deploying Ruby web application on Fedora with Puma (or other) application server and Nginx web server as a proxy, you might encounter SELinux forbidding Nginx to use the Puma socket. Here is how to create a SELinux policy module that you can use during your server provisioning.
If you are setting up your own remote server/VPS you will probably like to make it easy to deploy your code with simple git push. In other words you want to setup something that providers such as Heroku or OpenShift let you do to deploy your code. Luckily, it’s very easy! Continue reading
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
How to solve collisions of VirtualBox with virtual bridges on Fedora (e.g. when running Vagrant). Continue reading
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