matthiasr

Someone asked in chat (paraphrased) "I am coming from synchronous online systems, and now am going to work on a queue-based system. What should I be aware of?" This is a (somewhat freely-associated) collection of thoughts, based on my experience at SoundCloud.

rain-1

Why is IRC distributed across multiple servers?

I have been wondering for a long time why IRC networks have multiple servers. Wouldn't it be simpler just to use a single server?

One of the problems of having multiple servers is that netsplits can occur. Anybody who has been on IRC for a while will have witnessed one. Hundreds of people suddenly ripped out of the chat. This can also screw up channel and user modes, and 'some people' have been known to wait for netsplits in order to takeover channels or enter password protected channels.

So lets compare situation (A) a single IRC server everyone connects to with the current setup people use (B) multiple servers. Let's say you run an IRC network with u = 40,000 users and n = 20 server nodes that people connect to via round robin DNS (meaning that when people resolve the DNS it gives them a random server from the set of 20 to connect to). These are vaguely realistic numbers modelled after libera.chat.

So in (B) you have roughly u/n = 2000 clients connected

m-radzikowski

#!/usr/bin/env bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

yogthos

Introductory resources

• High level overview https://yogthos.github.io/ClojureDistilled.html
• An Animated Introduction to Clojure https://markm208.github.io/cljbook/
• Interactive tutorial in a browser https://tryclojure.org/
• Interactive exercises http://clojurescriptkoans.com/
• Clerk notebooks with introductory examples https://github.clerk.garden/anthonygalea/notes-on-clojure
• More interactive exercises https://4clojure.oxal.org/
• Lambda Island tutorials https://lambdaisland.com/
• Functional Programming with Clojure resources https://practicalli.github.io/

dcchambers

Generate a PDF from a Markdown file with Pandoc

Easy Steps For Mac OS

0. Have Homebrew installed and a markdown file you want to render to PDF.
1. Install Pandoc brew install pandoc
2. Install basictex brew cask install basictex - needed for the pdflatex tool.
3. Symlink the pdflatex to your /usr/local/bin so pandoc can easily find it. ln -s /Library/TeX/Root/bin/x86_64-darwin/pdflatex /usr/local/bin/pdflatex
4. Use Pandoc to generate a PDF from a Markdown file. pandoc input.md -o output.pdf

• By default the margins are pretty large. To optionally change the margins: pandoc input.md -o output.pdf -V geometry:margin=1in

theojulienne

#!/usr/bin/python
bpf_text = """
#include <linux/ptrace.h>
#include <linux/sched.h>        /* For TASK_COMM_LEN */

#include <linux/icmp.h>
#include <linux/netdevice.h>

struct probe_icmp_data_t
{

rjhansen

SKS Keyserver Network Under Attack

This work is released under a Creative Commons Attribution-NoDerivatives 4.0 International License.

Terminological Note

"OpenPGP" refers to the OpenPGP protocol, in much the same way that HTML refers to the protocol that specifies how to write a web page. "GnuPG", "SequoiaPGP", "OpenPGP.js", and others are implementations of the OpenPGP protocol in the same way that Mozilla Firefox, Google Chromium, and Microsoft Edge refer to software packages that process HTML data.

Who am I?

lizthegrey

default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'

pyaillet

Kubernetes tasks

• Install tools
  • Install and Set Up kubectl
  • Install Minikube
• Configure Pods and Containers
  • Assign Memory Resources to Containers and Pods
  • Assign CPU Resources to Containers and Pods
  • Configure Quality of Service for Pods
• Assign Extended Resources to a Container

apolloclark

Approach

1. Inventory Management
2. Access Management
3. Configuration Management
4. Patch Management
5. Logging and Monitoring
6. Alerts
7. Automated Remediation

• Keep it simple