thekalinga

Kafka frequent commands

Assuming that the following environment variables are set:

• KAFKA_HOME where Kafka is installed on local machine (e.g. /opt/kafka)
• ZK_HOSTS identifies running zookeeper ensemble, e.g. ZK_HOSTS=192.168.0.99:2181
• KAFKA_BROKERS identifies running Kafka brokers, e.g. KAFKA_BROKERS=192.168.0.99:9092

Server

Start Zookepper and Kafka servers

thekalinga

Using VAAPI's hardware accelerated video encoding on Linux with Intel's hardware on FFmpeg and libav

Hello, brethren :-)

As it turns out, the current version of FFmpeg (version 3.1 released earlier today) and libav (master branch) supports full H.264 and HEVC encode in VAAPI on supported hardware that works reliably well to be termed "production-ready".

thekalinga

Installing Nvidia Graphics Driver and Cuda on Ubuntu

Remove any previously installed Nvidia drivers

$ sudo apt-get remove --purge nvidia-*
$ sudo apt-get autoremove
$ sudo apt-get autoclean

You can choose to install CUDA drivers from .deb file or .run file

thekalinga

Installing Nvidia Graphics Driver and Cuda on Ubuntu

Remove any previously installed Nvidia drivers

$ sudo apt-get remove --purge nvidia-*
$ sudo apt-get autoremove
$ sudo apt-get autoclean

You can choose to install CUDA drivers from .deb file or .run file

thekalinga

SVG fragment builds for reveal.js

Basic use case

• make an SVG (maybe in inkscape)
  • save it someplace reveal.js can find it (maybe next to your presentation)
  • figure out how to identify them (maybe use named layers)
• in reveal.js/index.html
  • add reveal-svg-fragment.js as a dependency
  • in a <section> of reveal.js markup
• add data-svg-fragment="" to something, e.g.

thekalinga

# Google Art Project fullsize image downloader.
# By Henrik Nyh <http://henrik.nyh.se> 2011-02-05 under the MIT license.
# Requires Ruby and ImageMagick.
#
# Usage e.g.:
#   ruby google_art_project.rb http://www.googleartproject.com/museums/tate/portrait-of-william-style-of-langley-174
#
# You can specify multiple URLs on the command line, separated by space.
# Or you can specify no URLs on the command line and instead list them at the end of this file, one on each line,
# with "__END__" before the list.

thekalinga

If you have a package where a lot of people are still using a legacy version of it you might want to keep pushing (security-)fixes to that "branch".

Let's say the "latest" version of your package is "5.4.0", but there is as significant amount of people still using "4.7.4" – the last version you released before doing "5.0.0".

You found a critical bug in "5.4.0" and push it as out as "5.4.1", but it applies to "4.7.4" as well and so you want to do "4.7.5".

Assuming you have semantic-release already set up, you can follow these steps to get that "4.7.5" legacy support release out.

1. Go to the relevant commit: git checkout v4.7.4
2. Create a new branch from it: git checkout -b 4.x (You can choose any branch name, just make sure to use the same in step 3)

thekalinga

buildscript {
    ext {
        springBootVersion = '1.2.5.RELEASE'
    }
    
    ext['spring.version'] = '4.2.1.RELEASE'
	
    repositories {
        mavenCentral()
    }

thekalinga

# VCL for Varnish - How to cache your dynamic pages 
# SFPHP.org Apr 9, 2013

# See: https://github.com/varnish/libvmod-header
# This varnish mod allows us to easily manipulate the Set-Cookie responses
import header;

probe varnish_probe {
  .url = "/ping";
  .timeout = 2s;

thekalinga

{
    "_description: Name of City, or Town": {
        "State": "The Indian State under which this City/Town exists.",
        "GeoCode": [
            "Latitude",
            "Longitude"
        ],
        "PinCodes": [
            "All",
            "The",