I needed a cheap heatsink for my Raspberry Pi 3 that I use as a music player/server. To maximise performance, I wanted to overclock the computer for faster searching and handling of all my music. I’ve managed to overclock my main Stratum-1 NTP server to 1350MHz without any problems, but the dinky little aluminum heatsink was way to anaemic so I found a very cheap DIY solution to my problem. With this heatsink I can run the Raspberry Pi 3 at 1.5GHz all day at full tilt without any problems!
I have two Stratum-1 NTP servers using Raspberry Pi 2’s as servers. But the two setups are quite different.
This is my main NTP Stratum-1 server. It is available at ntp.jacken.se but it is also in the .se pool of ntp.org.
It’s a Raspberry Pi 2 I use a Raspberry Pi 3 that I have connected a U-Blox Neo-7 GPS receiver to. But i’m not using the 1 PPS signal coming out of the U-Blox. I have a Trimble GPSDO that I bought from eBay. The unit has two 10 MHz lab reference outputs and one 1 PPS output. But after measuring the
signal coming out from the GPSDO, I realised that the timing speed for the seconds “Tick” was only 10 µsec which is way to fast for the Raspberry Pi to pick up as an interrupt on one of the GPIO pins. So I built a pulse extender, making the pulse around 250 millisec instead. And now the Raspberry Pi picks up the pulse without problems. Some GPSDO units has the ability to set the pulse width by programming the unit via a serial port, but I can’t find that feature on this unit (which is poorly documented and was OEM made for some other manufacturer) so I had to do it with hardware. So how does it look when crunching the numbers on it
Nagios Directory Index Forbidden by Options Directive
After installing Nagios on a Raspberry Pi 2 Model B by following these installation instructions, I ran into a irritating problem. When trying to connect, I got the authentication dialog, but after that I got an access error in my browser.
I searched around on Google but couldn’t find a solution. But after a lot of fiddling with Apache2 I found a solution. There’s a problem with the standard installation of the file in /etc/apache2/conf.d/nagios.conf created by make install-webconf
When setting up a Raspberry Pi with SqueezePlug, my favorite distribution for setting up a music server I always get the error message “avahi-daemon disabled because there is a unicast .local domain” because I have a lot of Apple equipment configured with Bonjour. To fix it, all you need to do is to edit
and change the line:
then restart the Avahi-daemon with