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FreeBSD migrating user accounts
Quick and dirty way to migrate user accounts from one FreeBSD box to another. From the source box you will only need two files: /etc/master.passwd /etc/group copy them to the target box, but DON’T...
View ArticleSetting up SSH access with server keys (no password) in FreeBSD
You want to login from user@host-a to user@host-b automatically (with no password prompt). Install ssh-copy-id in the host-a. This little handy script takes care of all the dirty details from your...
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DNS server with djbdns (VegaDNS GUI + bonus replication)
This is my personal guide to setup djbdns tinydns DNS server to publish domain name information to the Internets. If djbdns, tinydns, name server, dns are strange words just move along, move along… If...
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Parsing Media RSS with PHP SimpleXML
Parsing XML docs with PHP SimpleXML is pretty straightforward. Yesterday i lost around 5 minutes to parse a Media RSS XML, and that was weird because normally with SimpleXML you take like 30 seconds… A...
View Article(auto magically) Deleting old Spam emails
If you followed My Qmail installation guide, or are using some kind of webmail or IMAP client that puts “SPAM” marked emails in some special folder, you can provide auto delete of old spam emails. The...
View Article.qmail delivery filtering by adress and subject
My goal was simple, to filter incoming emails by subject and to address (on a catch-all address…) in the server and move the matches to a specific folder instead of the normal delivery. I’m running a...
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Hands on the MK809II
I bought myself a MK809II, a Chinese TV stick running Android that connects to the HDMI port of your dumb TV and transforms it in a smart TV. It’s pretty inexpensive, going for about 50 euros and...
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Qmail/Vpopmail renaming a domain
In a Qmail/Vpopmail email server system, there is no direct way to rename a domain. Let’s say, you have a costumer that is using domain.net and then registers domain.com to replace domain.net. The...
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Raspberry PI configuring Wi-Fi command-line
This was a saga… i bought myself a second hand USB dongle, a Dynamode WL-700N-XS ultra compact (nano) 802.11b/g/n compatible Wi-Fi adapter, based in tbe Realtek 8188CU chipset. A fully updated USB...
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Raspberry GPIO
Finally the fun stuff. Messing around with the General Purpose Input Output of the PI. So, first things first. First you must identify what revision PI you are working. Visually, looking at it, if...
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How to calculate resistors for leds
For the, what resistor should i put in the circuit so my led don’t fry question. There is a very easy way, go to a on-line calculator site like http://ledcalculator.net/, input the values and bazinga...
View ArticlePHP get a Youtube video duration
To make this work you need to go to Google Developers Console, create a project, enable the YouTube Data API v3, and get a key in authentication key in credentials. This is pretty much the difficult...
View ArticleFreeBSD – Configure a private IP jail
If you use jails (or want to use jails) but your pool of IP addresses is somewhat limited don’t worry. You can fully configure and use a jail in a private IP, and even assign port forwarding from the...
View ArticleReverse DNS with djbdns on private IP
Preface: I remember long time ago when i had to mess around with BIND, the old, venerable, security flaws rich history, and of course the not for humans configuration file, name server. I’m so happy...
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My Qmail installation guide reloaded
A couple of years ago I posted my Qmail installation guide, and has expected it served me good when was time to reform to the old mail server. But, i made some changes on this iteration and i think is...
View ArticleLinux snapshots – apt-btrfs-snapshot
Since a couple (half dozen) of years I have been using the beautiful KDE Desktop in the very well made and supported Kubuntu distribution. As technology progresses and the switch on desktop computers...
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Btrfs killed ZFS (on my desktops)
Following the latest post about Btrfs, until yesterday both ZFS and Btrfs were running for testing and evaluation purposes, in my primary desktop machine. The outcome was pretty straight forward, i...
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Raspberry PI open hotspot for your company site(s) only
The problem is really simple, you want/need to give open Wifi to your customers (let’s say inside a shop), but to you own company website (or websites) only. And nothing else, no other resources in the...
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CTT – Correios de Portugal check-digit
I was unable to find anywhere a Portuguese national postal service, package registry number check-digit validation. So, I politely asked them and soon after a PDF describing the algorithm was on my...
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Customizing WordPress Jetpack Mobile Theme
I have successfully using Jetpack Mobile Theme to serve the mobile version of my blogs, as of now it uses a theme called minieleven (that is starting to look a bit old…), with some tweaks here and...
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