Prashant Shahi prashant-shahi

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

In experience to get a proper working multiple wan configuration using mwan3 starting from scratch you should:

Important: this works well on OpenWRT 15.05.1, on newer versions there was some breaking changes, for example, the wan ifaces have ipv6 capability and now are named with letters ("wan, wanb... , wanc" instead of "wan, wan2... wan3" so wanb6 means 2nd wan ipv6.): https://github.com/openwrt/packages/blob/master/net/mwan3/files/etc/config/mwan3

The official documentation seems to be very detailed and up to date, I recommend reading those first: https://openwrt.org/docs/guide-user/network/wan/multiwan/mwan3 but I recommend to give a look at my config file below, since my approach for policyes is very nice.

First of all: Activate conntrack, docs says that is important and neccesary to get MWAN3 work properly, and it is needed to reboot:

GNU Make Cheatsheet

Based on https://www.gnu.org/software/make/manual/html_node/Quick-Reference.html

Directives

Directive	Description
`define variable` `define variable =` `define variable :=` `define variable ::=` `define variable +=` `define variable ?=` `endef`	Define multi-line variables.
`undefine variable`	Undefining variables.

Kafka 0.11.0.0 (Confluent 3.3.0) added support to manipulate offsets for a consumer group via cli kafka-consumer-groups command.

List the topics to which the group is subscribed

kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --describe

Note the values under "CURRENT-OFFSET" and "LOG-END-OFFSET". "CURRENT-OFFSET" is the offset where this consumer group is currently at in each of the partitions.

Reset the consumer offset for a topic (preview)

CFP Outline

an outline for talks to be submitted to PaperCall.io

OVERVIEW

This document is a collection of resources and helpful information for writing a good CFP. Many of the notes and tips are direct quotes from the resources listed below. They are mostly notes I took as I read. The outline itself is formatted for PaperCall.io, and the italicized notes are from their site as well.

	package main

	import (
	"bytes"
	"html/template"
	"log"

	gomail "gopkg.in/gomail.v2"
	)

	Originall From: Posted 2015-05-29 http://ubwg.net/b/full-list-of-ffmpeg-flags-and-options

	This is the complete list that’s outputted by ffmpeg when running ffmpeg -h full.

	usage: ffmpeg [options] [[infile options] -i infile]… {[outfile options] outfile}…

	Getting help:
	-h — print basic options
	-h long — print more options
	-h full — print all options (including all format and codec specific options, very long)

	pragma solidity ^0.4.11;
	contract BikramSamvat{

	/*
	* Unix timestamp to Bikram Samvat (Date Time Library)
	* @NepalBitcoin
	*/

	address Bikram;
	enum DaysInWeek{SUN,MON,TUE,WED,THU,FRI,SAT}

	/*
	Small demo to show chaining of API calls. We're using these APIs:
	https://weathers.co for current weather in 3 cities, and
	https://api.github.com/search/repositories?q=<term> to search GitHub repos for
	the 'hottest' city. For example, we'll grab weather for 3 cities, pick the hottest one,
	then hit GitHub with a search for repos that have that city's name. A bit nonsensical
	but I just wanted to demonstrate using the results of one API call to populate a second.

	The problem we're trying to solve is that the API calls are asynch, and one of them
	(getCityTemperatures) loops through several asynch calls (one for each city), and they

	SELECT table,
	formatReadableSize(sum(bytes)) as size,
	min(min_date) as min_date,
	max(max_date) as max_date
	FROM system.parts
	WHERE active
	GROUP BY table