Month: April 2019

StackOverflow: Developer Survey Results 2019

This year’s results for StackOverflow Developer Survey are in. This is probably the largest survey of IT professionals, with nearly 90,000 participating this year.

As always, there are plenty of insightful findings and correlations in the results. But one that I was somewhat glad to see was the attitude towards Blockchain technology.

While the mainstream media continues to confuse Blockchain with cryptocurrencies, technical people do understand the difference. And the majority (29.2% + 26.2% = 55.4%) of the survey respondents think it is useful for a variety of things outside of the cryptocurrency.

And with all the hype around cryptocurrencies and Blockchain, the majority of the organizations are not working with the technology just yet. Furthermore, of those that do work with Blockchain, the majority is NOT using it for the cryptocurrency.

That is pretty close to my mental picture of what’s going on.

How to disable IPv6 on CentOS / RHEL 7

Sometimes I miss the good old days …

Recently, I had an issue with one of the servers, where a bunch of services were attaching to IPv6 ports instead of the IPv4 ones. Rather than editing the configuration of each of these services, I wanted to simply disabled IPv6 on the machine.

In the old good days, things like these were easily done via the sysctl. I surely tried that option too, but it wasn’t enough. Turns out, the proper way these days is to do this via Grub, as per this blog post:

  1. Vim /etc/default/grub file
  2. Change: GRUB_CMDLINE_LINUX=”ipv6.disable=1 crashkernel=auto rhgb quiet”
  3. Regenerate and overwrite Grub config with: grub2-mkconfig -o /boot/grub2/grub.cfg
  4. Reboot.

That sounds a bit too excessive. But then again a reboot is also required for the proper disabling of SELinux, so I guess its’ fine.

Chrome Extensions: PHP Console and JavaScript Errors Notifier

Here are a couple of handy Google Chrome extensions that I came across the other day.

PHP Console

PHP Console can display PHP errors and var dumps in the Google Chrome Developer Console and notification popups. It can also execute PHP code remotely, with the help of this server side library.

JavaScript Errors Notifier

JavaScript Errors Notifier lets you know of any JavaScript errors either with an icon highlight, or with a popup window. This makes things a lot easier to notice.

You Don’t Need jQuery

You Don’t Need jQuery is a GitHub repository with a collection of code snippets that show how to do the most common jQuery bits in native JavaScript. The collection covers a whole range of subjects, like:

  • Query selector
  • CSS and style
  • DOM manipulation
  • AJAX
  • Events
  • Promises
  • Animations
  • … and more.

All examples should work just fine in all modern browsers.

Additionally, have a look at the You Might Not Need jQuery website.