Ivan Prisyazhnyy sitano

Moved to git repository: https://github.com/denji/golang-tls

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

Table Of Content

Skip to the relevant sections if needed.

2-min tutorial to do it the quick-and-dirty-way
Concepts for resolving Git conflicts
Setting up different editors / tool for using git mergetool
- Finding out what mergetool editors are supported
mergetool simple code example for vimdiff
- Resolving conflict from a Git pull
Other great references and tutorials

Signal handling and Ruby

Salvaged from Google Cache of http://www.lps-it.fr/blog/20151218-signal-handling-and-ruby.html

December 18, 2015
Linux Ruby

Since version 2.0.0, signal handling in Ruby can be tricky. I bet if you're here, it's because you've seen this error message :

These are my notes for connecting to a meraki client vpn from ubuntu 16.04. This configuration assumes you are using a psk for the ipsec auth.

Install the following packages:

apt-get install -y strongswan xl2tpd

Configure strong swan

Profiling performance

Using perf:

$ perf record -g binary
$ perf script | stackcollapse-perf.pl | rust-unmangle | flamegraph.pl > flame.svg

NOTE: See @GabrielMajeri's comments below about the -g option.

	#
	# ███╗ ███╗ ██████╗ ██╗ ██╗███████╗██████╗ ████████╗ ██████╗
	# ████╗ ████║██╔═══██╗██║ ██║██╔════╝██╔══██╗ ╚══██╔══╝██╔═══██╗
	# ██╔████╔██║██║ ██║██║ ██║█████╗ ██║ ██║ ██║ ██║ ██║
	# ██║╚██╔╝██║██║ ██║╚██╗ ██╔╝██╔══╝ ██║ ██║ ██║ ██║ ██║
	# ██║ ╚═╝ ██║╚██████╔╝ ╚████╔╝ ███████╗██████╔╝ ██║ ╚██████╔╝
	# ╚═╝ ╚═╝ ╚═════╝ ╚═══╝ ╚══════╝╚═════╝ ╚═╝ ╚═════╝
	#
	# ╔═════════════════════════════════════════════════════════════════╗
	# ║ https://github.com/denilsonsa/udev-joystick-blacklist ║

	#!/bin/bash

	PID=$1
	RUBY_BINARY=`which ruby`
	BT_FILENAME="/tmp/ruby-backtrace-$PID-$(date +%s).txt"
	cmdfile=$(mktemp)

	cat <<EOF > $cmdfile
	set \$old_stdout = dup(1)
	set \$old_stderr = dup(2)

	# On slow systems, checking the cached .zcompdump file to see if it must be
	# regenerated adds a noticable delay to zsh startup. This little hack restricts
	# it to once a day. It should be pasted into your own completion file.
	#
	# The globbing is a little complicated here:
	# - '#q' is an explicit glob qualifier that makes globbing work within zsh's [[ ]] construct.
	# - 'N' makes the glob pattern evaluate to nothing when it doesn't match (rather than throw a globbing error)
	# - '.' matches "regular files"
	# - 'mh+24' matches files (or directories or whatever) that are older than 24 hours.
	autoload -Uz compinit

	print("UPDATE AUG 2023: this script is beyond old and broken")
	print("You may find interesting and more up to date resources in the comments of the gist")
	exit()

	from slacker import Slacker
	import json
	import argparse
	import os

	# This script finds all channels, private channels and direct messages