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Grafana PNG export on headless Debian server (phantomjs / render fails with "404 page not found")

If it still fails after you've set "root_url" to the correct value in grafana.ini, you might want to check whether you can run phantomjs from the command line.

If you get "QXcbConnection: Could not connect to display / PhantomJS has crashed", then the explanation is here: Debian Bug #817277.

To fix it, I installed xvfb (apt-get install xvfb), and edited /usr/bin/phantomjs so that the last line now looks like this:
exec "/usr/bin/xvfb-run" --server-args="-screen 0 640x480x16" "/usr/lib/phantomjs/phantomjs" "$@"

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How to solve Edimax EW-7612UAn v2 (7392:7822) power management issues on Raspberry Pi (Raspbian WiFi disconnect)

  • On Raspbian, you don't need to install the 8192cu driver manually, as it comes with the distribution

  • To avoid disconnection issues, you need however to disable power management. This needs to be done in two places. First, this is what I have in /etc/modprobe.d/8192cu.conf:
    options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

  • This alone did not prevent the issue. I also had to add this entry to /etc/network/interfaces:
    auto wlan0
    allow-hotplug wlan0
    iface wlan0 inet dhcp
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
    wireless-power off
    iface default inet dhcp


Sources: https://github.com/xbianonpi/xbian/issues/217, https://www.kuerbis.org/2016/03/raspberry-pi-3-kurztipps-wlan-sleep-mode-verhindern/
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Using a Raspberry Pi running raspbmc to sync Fitbit One with galileo (fitbit linux sync)

(it should work with any other Debian-based Raspberry Pi distribution and all newer Fitbit devices that use BLE)
sudo -i
apt-get update
apt-get install python-pip
pip install galileo
galileo

You can then use cron or a simple shell script to periodically run galileo.

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vim instead of nano (Ubuntu / Debian)

apt-get install vim
update-alternatives --config editor

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raspbmc - getting rid of iptables

I don't need a firewall on my Raspberry PI which runs XMBC (raspbmc distribution) - it's in a dedicated subnet behind a firewall. Furthermore, there are several reports of iptables having an impact on the performance of network playback, causing buffering issues (although I didn't do any benchmark myself).

I modified /etc/network/if-up.d/secure-rmc by adding "exit 0" right at the beginning like this:
#!/bin/bash

exit 0

dec_to_bin() {
...

And then I ran:
apt-get remove iptables

This was followed by a reboot.

nb: the secure-rmc file appears to be a raspbmc addition, and it could probably just be deleted instead.

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