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目的

社内で色々なバックアップをしていましたが、個別にbashを書いていてメンテナンスしにくいと思ったので、Rubyでまとめてみました。

仕様

  1. バックアップしたい対象はそれぞれのサーバーで事前に準備(pg_dump等)
  2. バックアップを集約するサーバーで今回のプログラムを実行
  3. scpかrsyncのコピーコマンドとバックアップサーバー内の古いバックアップの削除コマンドをサポート
  4. コマンドの実行に失敗した場合はslackに通知
  5. バックアップの設定はyamlファイルで管理
  6. yamlファイルはERBを通して実行する

プログラム

Gemfile
# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem 'slack-ruby-client'
gem 'systemu'
gem 'hashie'
backup.rb
require 'systemu'
require 'slack-ruby-client'
require 'hashie'
require 'erb'
require 'yaml'
require 'fileutils'

def notification(config, content)
  Slack.configure do |cfg|
    cfg.token = config.slack.token
  end
  client = Slack::Web::Client.new
  client.auth_test
  text = "#{config.name}\n#{content}"
  client.chat_postMessage(channel: config.slack.channel, text: text, as_user: true)
end

def read_config(path)
  Hashie::Mash.new(YAML.load(ERB.new(File.read(path)).result))
end

def scp(command)
  status, stdout, stderr = systemu "/usr/bin/scp #{command.from} #{command.to}"
  raise "fail scp" unless status.success?
end

def rsync(command)
  status, stdout, stderr = systemu "/usr/bin/rsync -azq --delete #{command.from} #{command.to}"
  raise "fail rsync" unless status.success?
end

def clean(command)
  ymd = (Date.today - command.days ).strftime("%Y%m%d")
  re = Regexp.new(command.name_match)
  Dir::entries(command.dir).each do |it|
    if re =~ it
      FileUtils.rm_rf(File.join(command.dir, it)) if $1 < ymd
    end
  end
end

config = read_config(ARGV[0])
begin
  config.commands.each do |command|
    case command.type
    when 'scp' then
      scp(command)
    when 'rsync' then
      rsync(command)
    when 'clean' then
      clean(command)
    end
  end
rescue Exception => e
  # エラーのfull_messageにtermcapが入るのを防いでいる
  $stderr = $stdout
  notification(config, e.full_message)
  #puts e.full_message
end
webserver.yaml
name: webserver

slack:
  token: <%= ENV['SLACK_API_TOKEN'] %>
  channel: "#backup"

commands:
  - type: scp
    from: vps01:/home/me/backup/<%= Date.today.strftime("%Y%m%d") %>.tar.bz2
    to: /home/me/backup/webserver
  - type: clean
    name_match: ^(\d\d\d\d\d\d\d\d)\.
    dir: /home/me/backup/webserver
    days: 5
git.yaml
name: git backup

slack:
  token: <%= ENV['SLACK_API_TOKEN'] %>
  channel: "#backup"

commands:
  - type: rsync
    from: vps01:/var/git/
    to: /home/me/backup/git/<%= Date.today.strftime("%Y%m%d") %>
  - type: clean
    name_match: ^(\d\d\d\d\d\d\d\d)$
    dir: /home/me/backup/git
    days: 40
SLACK_API_TOKEN=xxxx bundle exec ruby backup.sh webserver.yaml
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