Socheat Sok socheatsok78

Moved to git-repository: https://github.com/denji/awesome-http-benchmark

Tools

Located in alphabetical order (not prefer)

ab – slow and single threaded, written in C
apib – most of the features of ApacheBench (ab), also designed as a more modern replacement, written in C
autocannon – fast HTTP/1.1 benchmarking tool written in Node.js
baloo – Expressive end-to-end HTTP API testing made easy, written in Go (golang)

Google Public NTP [AS15169]:

time.google.com

time1.google.com

time2.google.com

time3.google.com

INTRO

Concurrency is a domain I have wanted to explore for a long time because the locks and the race conditions have always intimidated me. I recall somebody suggesting concurrency patterns in golang because they said "you share the data and not the variables".

Amused by that, I searched for "concurrency in golang" and bumped into this awesome slide by Rob Pike: https://talks.golang.org/2012/waza.slide#1 which does a great job of explaining channels, concurrency patterns and a mini-architecture of load-balancer (also explains the above one-liner).

Let's dig in:

Goroutines

Default behavior dictates the following order for ZSH startup files:

/etc/zshenv
~/.zshenv
/etc/zprofile (if login shell)
~/.zprofile (if login shell)
/etc/zshrc (if interactive)
~/.zshrc (if interactive)
/etc/zlogin (if login shell)
~/.zlogin (if login shell)

README

Create a template service file at /etc/systemd/system/[email protected]. The template parameter will correspond to the name of target host:

[Unit]
Description=Setup a secure tunnel to %I
After=network.target

Golang - Building Executables for Different Architectures

env GOOS=target-OS GOARCH=target-architecture go build package-import-path

# Example
env GOOS=darwin GOARCH=amd64 go build
env GOOS=darwin GOARCH=amd64 go build main.go
env GOOS=darwin GOARCH=amd64 go build github.com/zoo/york/foo/bar

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)
openssl ecparam -genkey -name secp384r1 -out server.key

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

	# Detect operating system in Makefile.
	# Author: He Tao
	# Date: 2015-05-30

	OSFLAG :=
	ifeq ($(OS),Windows_NT)
	OSFLAG += -D WIN32
	ifeq ($(PROCESSOR_ARCHITECTURE),AMD64)
	OSFLAG += -D AMD64
	endif

	package main

	import (
	"context"
	"flag"
	"fmt"
	"io"
	"net"
	"net/http"
	"os"