cpursley

PostgreSQL is Enough

• Simplify: move code into database functions
• Just Use Postgres for Everything
• PostgreSQL is the worlds’ best database
• Postgres is eating the database world
• Hacker News discussion

Background and Cron Jobs

tyrm

#!/bin/bash

set -e

#imports
. /etc/default/backup

# config
NAME=$1

tyrm

#!/bin/bash

set -e

. /etc/default/backup

INSTANCE=$1

case $INSTANCE in

darksidelemm

Setting up STRF Data Capture & Processing

Author: Mark Jessop (VK5QI) vk5qi@rfhead.net

This guide provides information on how to capture FFT data using the strf toolset, process it to look for satellite signals, and finally compare their doppler shift against TLEs from the SpaceTrack database. This can help with resolving the 'TLE lottery' after new launches, or cataloguing transmissions from spacecraft already in orbit.

It should be noted that the analysis described in this document is but a small subset of what the strf tools are capable of! Scott Tilley has a post describing some of the history behind strf and giving a crash course on the relationship between orbital dynamics and the doppler effect here: https://skyriddles.wordpress.com/2019/01/04/basic-orbital-dynamics/

The target platform is Debian-based distributions (e.g. Debian, Raspbian, Ubuntu), but should be applicable to other Linux-based platforms. The data processing software (rfplot and rffit) is also k

lxe

Receive GOES-16 and GOES-17 Images with a Raspberry Pi and RTL-SDR dongle

Also see the original Pieter Noordhuis's guide

Hardware

You need:

1. Raspberry Pi Model B (or B+) with a MicroSD Card $35-40
2. An RTL-SDR dongle:

cheethoe

# This will use osd.5 as an example
# ceph commands are expected to be run in the rook-toolbox
1) disk fails
2) remove disk from node
3) mark out osd. `ceph osd out osd.5`
4) remove from crush map. `ceph osd crush remove osd.5`
5) delete caps. `ceph auth del osd.5`
6) remove osd. `ceph osd rm osd.5`
7) delete the deployment `kubectl delete deployment -n rook-ceph rook-ceph-osd-id-5`
8) delete osd data dir on node `rm -rf /var/lib/rook/osd5`

bobrik

Overly aggressive CFS

We're looking at CPU bandwidth control via CFS:

• https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt

Reproduction program

Program does number of iterations, in each iteration we burn CPU in small chunks until we get 5ms of real time spent. On each iteration we also print how much

sj26

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit

danielballan

from __future__ import (absolute_import, division, print_function,
                        unicode_literals)

import six
import matplotlib as mpl
import matplotlib.pyplot as plt
import matplotlib.path as mpath
import matplotlib.patches as mpatches

from IPython.html import widgets

fperez