mariash

package main

import (
	"bytes"
	"io"
	"net/http"
	"net/http/httptrace"
	"net/http/httputil"
	"net/url"
	"time"

mariash

terraform {
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "~> 4.52"
    }
  }
}

variable "project_id" {

mariash

diff --git a/agent/bootstrap.go b/agent/bootstrap.go
index 6e6a97f8..3944aa24 100644
--- a/agent/bootstrap.go
+++ b/agent/bootstrap.go
@@ -4,8 +4,10 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"os"
 	"path"

mariash

- name: warp-drive-deploy-cf-deployment
  serial_groups: [warp-drive-cf-deployment]
  plan:
  - get: candidate-lock
    passed: [candidate]
    trigger: true
  - in_parallel:
    - get: deployments-diego
      resource: warp-drive-config
    - get: diego-release

mariash

Emulating wide area network delays

This is the simplest example, it just adds a fixed amount of delay to all packets going out of the local Ethernet.

# tc qdisc add dev eth0 root netem delay 100ms
Now a simple ping test to host on the local network should show an increase of 100 milliseconds. The delay is limited by the clock resolution of the kernel (Hz). On most 2.4 systems, the system clock runs at 100 Hz which allows delays in increments of 10 ms. On 2.6, the value is a configuration parameter from 1000 to 100 Hz.

Later examples just change parameters without reloading the qdisc

Real wide area networks show variability so it is possible to add random variation.

mariash

#!/usr/bin/env ruby

require "socket"

class ConnectionProxy

  def initialize(remote_host, remote_port, listen_port)
    @max_threads = 32
    @threads = []
    @server_sockets = {}

mariash

#!/bin/bash
# NPM_0_6_12=~/.nvm/v0.6.12/bin/npm NPM_0_6_8=~/.nvm/v0.6.8/bin/npm ./npm-install-problem.sh
# Install module with npm from node v0.6.12 and then use npm from node v0.6.8 to rebuild it and see it fail
# + exit code is 0 with the force option even on failure

# Npm saves install information in package.json so next time npm build is run on package with different configuration it may fail
$NPM_0_6_12 install bcrypt@0.7.2
cd ./node_modules/bcrypt

# package.json was updated with scripts -> install that looks like "node-gyp rebuild"

mariash

# copy with preserve updates metadata of file and if file that symlink points to has not been copied yet it fails 

require "fileutils"

`mkdir ./src`
`touch ./src/foo`

# Important that symlink name goes before source name in alphabetical order (bar points to foo)
`ln -s ./src/foo bar`

mariash

open('/tmp/f','w'){|f| f << 'sekrit'}
f = open('/tmp/f')

exec("ruby -e 'p IO.open(#{f.fileno}).read'")
# Prints 'sekrit'

mariash

#!/usr/bin/env bash

source /etc/profile.d/chruby.sh
chruby 2.1.6

total_counter=0
success_counter=0
fail_counter=0

cd bosh-src