Koichi Shiraishi zchee

負荷の管理

100%の時間利用可能なサービスはない
- 配慮のないクライアント
- 50倍の要求
  - （訳注: 上記2つはPokemon Goのことでもある）
- スラフィックのスパイク
- 海底ケーブルの切断
私達のサービスに依存するユーザーがいる

Source: https://web.archive.org/web/20141216073338/https://gkbrk.com/blog/read?name=reverse_engineering_the_speedtest_net_protocol Author: Gökberk Yaltıraklı

Reverse Engineering the Speedtest.net Protocol

After finishing my command line speed tester written in Rust, I didn't have a proper blog to document this process. A few days ago I wrapped up a simple blogging script in Python so hopefully it works good enough to explain how everything works.

By now I have already figured out the whole protocol for performing a speed test but I will write all the steps that I took so you can learn how to reverse engineer a simple protocol.

The code that I wrote can be found at https://github.com/gkbrk/speedtest-rust.

Kubernetes Master Nodes Backup for Kops on AWS - A step-by-step Guide

For those who have been using kops for a while should know the upgrade from 1.11 to 1.12 poses a greater risk, as it will upgrade etcd2 to etcd3.

Since this upgrade is disruptive to the control plane (master nodes), although brief, it's still something we take very seriously because nearly all the Buffer production services are running on this single cluster. We felt a more thorough backup process than the currently implemented Heptio Velero was needed.

To my surprises, my Google searches didn't yield any useful result on how to carry out the backup steps. To be fair, there are a few articles that are specifically for backing up master nodes created by kubeedm but nothing too concrete for `kop

	package main

	import (
	"go/ast"
	"go/parser"
	"go/token"
	"strconv"
	)

	// 实现一个只支持int,只支持加法,函数只有println,只支持一个参数的Go语言子集....

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<!-- iOS 10, macOS Sierra, and friends bring a new logging subsystem that's
	supposed to scale from the kernel, up to frameworks, and up to apps. It defaults
	to a more regimented, privacy-focused approach that large apps and complex
	systems need.

	It, along with Activity Tracing introduced in iOS 8 and macOS Yosemite and the
	Console app in macOS Sierra, hope to help you graduate from caveman debugging to

	package cgroup

	import "os"
	import "syscall"
	import "io/ioutil"
	import "strconv"
	import "os/exec"
	import "strings"
	import "errors"

	codecov:
	token: uuid # Your private repository token
	url: "http" # for Codecov Enterprise customers
	slug: "owner/repo" # for Codecov Enterprise customers
	branch: master # override the default branch
	bot: username # set user whom will be the consumer of oauth requests
	ci: # Custom CI domains if Codecov does not identify them automatically
	- ci.domain.com
	- !provider # ignore these providers when checking if CI passed
	# ex. You may test on Travis, Circle, and AppVeyor, but only need

	# This hosts file is brought to you by Dan Pollock and can be found at
	# http://someonewhocares.org/hosts/
	# You are free to copy and distribute this file for non-commercial uses,
	# as long the original URL and attribution is included.

	#<localhost>
	127.0.0.1 localhost
	127.0.0.1 localhost.localdomain
	255.255.255.255 broadcasthost
	::1 localhost

	#!/bin/sh
	# Launch a Pod ab-using a hostPath mount to land on a Kubernetes node cluster as root
	# without requiring `privileged: true`, in particular can abuse `DenyExecOnPrivileged`
	# admission controller.
	# Pod command in turn runs a privileged container using node's /var/run/docker.sock.
	#
	# Tweaked for PKS nodes, which run their docker stuff from different
	# /var/vcap/... paths
	node=${1}
	case "${node}" in

	#!/bin/bash

	FILES=$@

	echo "Migrate: $FILES"

	sed -i "s/errors.Wrapf(\(.\), \"\(.\)\", \(.*\))/fmt.Errorf(\"\2: %w\", \3, \1)/g" $FILES
	sed -i "s/errors.Wrap(\(.\), \"\(.\)\")/fmt.Errorf(\"\2: %w\", \1)/g" $FILES
	sed -i "s/errors.Errorf/fmt.Errorf/g" $FILES
	goimports -w .