arduanov

echo "fs.file-max=1048576" >> /etc/sysctl.conf
echo "net.core.rmem_max = 16777216" >> /etc/sysctl.conf
echo "net.core.wmem_max = 16777216" >> /etc/sysctl.conf
echo "net.ipv4.tcp_rmem = 4096 87380 16777216" >> /etc/sysctl.conf
echo "net.ipv4.tcp_wmem = 4096 65536 16777216" >> /etc/sysctl.conf

sysctl -p

echo "* soft nofile 1048576" >> /etc/security/limits.conf
echo "* hard nofile 1048576" >> /etc/security/limits.conf

sysboss

#!/usr/bin/env python3
#
# Query AWS Athena using SQL
# Copyright (c) Alexey Baikov <sysboss[at]mail.ru>
#
# This snippet is a basic example to query Athen and load the results
# to a variable.
#
# Requirements:
# > pip3 install boto3 botocore retrying

mrbar42

Secured HLS setup with Nginx as media server

This example is part of this article.

This is an example for an HLS delivery with basic security. Nginx compiled with nginx-rtmp-module & secure-link is used as media server. Features:

• Domain filtering
• Referrer filtering
• Embed buster

bzerangue

On Ubuntu 16.04 LTS, I successfully used the following to disable suspend:

sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

And this to re-enable it:

sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target

mvanbaak

#!/bin/sh
# default commands for osx to make it nicer to work with

##########################
# General UI?UX settings #
##########################

# Set hostname (hex of MVB9APPS)
sudo scutil --set ComputerName "0x4d56423941505053"
sudo scutil --set HostName "0x4d56423941505053"

WoZ

Usage: node strace_log_analyzer.js strace.log /tmp

This scripts parses input file that must contain strace log from a single thread. Then script calculates:

• execution time of read/write syscall for each file descriptor and summarize execution time for each 1 sec period,
• calulates amount of read/write syscalls for each file descriptor

strace log must be collcted with -t -T -f options.

rondy

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

pavelbinar

Extract Subtitles From mkv

Instuctions available (moved) at REMOTE ORIGIN website: Extract Subtitles From mkv

Hammer2900

import asyncio
from contextlib import closing

import aiohttp


async def download_file(session: aiohttp.ClientSession, url: str):
    async with session.get(url) as response:
        assert response.status == 200
        # For large files use response.content.read(chunk_size) instead.

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?