kenjiskywalker

https://github.com/rails/rails/blob/4b6449f84d983f961419e834c86f97b578b9eb23/railties/lib/rails/application/configuration.rb#L80-L82

      def database_configuration
        path = paths["config/database"].existent.first
        yaml = Pathname.new(path) if path

https://github.com/rails/rails/blob/4b6449f84d983f961419e834c86f97b578b9eb23/railties/lib/rails/application/configuration.rb#L86

kenjiskywalker

• /etc/hosts.ctmpl

{{range services}}
{{range service .Name}}
{{.Address}} {{.Name}}{{end}}{{end}}

• /etc/hosts

kenjiskywalker

• command ./consul-template_0.6.0_linux_amd64/consul-template -consul 127.0.0.1:8500 -template "/etc/hosts.ctmpl:/etc/hosts:service dnsmasq restart &"

• /etc/hosts.ctmpl

# node{{ range nodes }}
{{.Address}} {{.Node}}{{ end }}

# service{{range $tag, $services := service "echo" | byTag}}
{{range $services}}{{.Address}} {{$tag}}.{{.Name}}{{end}}{{end}}

kenjiskywalker

#!/usr/bin/env ruby

require "poppler"
require 'pp'

file = ARGV[0]

document = Poppler::Document.new(file)
document.each do |d|
  puts d.get_text

kenjiskywalker

Fluentd ソースコード完全解説

英題：Fluentd Hacking Guide

目次

30分しかないため斜線部分は今回省く

• Fluentd の起動シーケンスとプラグインの読み込み
• Fluentd の設定ファイルのパース
• Input Plugin から Output Plugin にデータが渡る流れ

kenjiskywalker

['-']% curl -X PUT -d 'bar' http://127.0.0.1:8500/v1/kv/foo
true
['-']%
['-']%
['-']% curl -s http://127.0.0.1:8500/v1/kv/foo | jq .
[
  {
    "CreateIndex": 538,
 "ModifyIndex": 538,

kenjiskywalker

aws autoscaling describe-launch-configurations \
    | jq '.LaunchConfigurations[] \
    | select(.LaunchConfigurationName \
    | contains("*LAUNCH_CONFIG_NAME*")) \
    | .LaunchConfigurationName ' \
    -r \

kenjiskywalker

$ aws ec2 describe-images \
      --filters "Name=name,Values='*AMI_NAME*'" \
      --query 'Images[].[Name,ImageId]' \
      --output text`

kenjiskywalker

レプリカセットつくるコマンド

mkdir -p /tmp/mongo
chmod 777 /tmp/mongo
mkdir -p /tmp/mongo/node[0-2]
mkdir -p /tmp/mongo/log/

mongod --replSet foo --smallfiles --port 27017 --dbpath /tmp/mongo/node0 
mongod --replSet foo --smallfiles --port 27018 --dbpath /tmp/mongo/node1

kenjiskywalker

package main

import (
	"encoding/json"
	"github.com/mizzy/consul-catalog"
	"log"
	"os"
	"reflect"
	"time"
)