[インフラ] Serverspecをざっくり試す – 端くれプログラマの備忘録

サーバーテストの自動化ツールとして評判の高い、Serverspecをざっくり試してみた。

テスト環境

VPSプロバイダ: DigitalOcean (リージョン: SFO3)
マシンタイプ: Shared CPU (1 CPU, 1 GB RAM)
OS: CentOS 7 x64

セットアップ

Serverspecではローカルとリモートの両方のマシンのテストを行えるが、今回はローカルマシンのテストのみ行ってみた。マシンを作成したら、テスト対象としてApacheをインストールして実行しておく。

Serverspecの実行にはRubyが必要なので、Rubyをインストールしてから、serverspecのgemをインストールする。

gitのインストール
# yum install git
# git --version
git version 1.8.3.1

Rubyのインストール
# cd /opt
# git clone https://github.com/sstephenson/rbenv.git
# mkdir -p /opt/rbenv/plugins
# cd /opt/rbenv/plugins
# git clone https://github.com/sstephenson/ruby-build.git

# vi ~/.bashrc
# rbenv global config
export RBENV_ROOT="/opt/rbenv"
export PATH="${RBENV_ROOT}/bin:${PATH}"
eval "$(rbenv init -)"

# yum -y install gcc make openssl-devel libffi-devel ruby-devel readline-devel rubygems sqlite-devel bzip2
# /bin/bash -lc "rbenv install 2.6.0"
# /bin/bash -lc "rbenv rehash"
# /bin/bash -lc "rbenv global 2.6.0"

Serverspecのインストール
# gem install serverspec

gitのインストール

# yum install git

# git --version

git version 1.8.3.1

Rubyのインストール

# cd /opt

# git clone https://github.com/sstephenson/rbenv.git

# mkdir -p /opt/rbenv/plugins

# cd /opt/rbenv/plugins

# git clone https://github.com/sstephenson/ruby-build.git

# vi ~/.bashrc

# rbenv global config

export RBENV_ROOT="/opt/rbenv"

export PATH="${RBENV_ROOT}/bin:${PATH}"

eval "$(rbenv init -)"

# yum -y install gcc make openssl-devel libffi-devel ruby-devel readline-devel rubygems sqlite-devel bzip2

# /bin/bash -lc "rbenv install 2.6.0"

# /bin/bash -lc "rbenv rehash"

# /bin/bash -lc "rbenv global 2.6.0"

Serverspecのインストール

# gem install serverspec

Serverspecのインストールが完了したら、テストの雛形を作成する。

# cd ~
# pwd
/root
# serverspec-init
Select OS type:

  1) UN*X
  2) Windows

Select number: 1

Select a backend type:

  1) SSH
  2) Exec (local)

Select number: 2

 + spec/
 + spec/localhost/
 + spec/localhost/sample_spec.rb
 + spec/spec_helper.rb
 + Rakefile
 + .rspec

# cd ~

# pwd

/root

# serverspec-init

Select OS type:

1) UN*X

2) Windows

Select number: 1

Select a backend type:

1) SSH

2) Exec (local)

Select number: 2

+ spec/

+ spec/localhost/

+ spec/localhost/sample_spec.rb

+ spec/spec_helper.rb

+ Rakefile

+ .rspec

作成されたテストの雛形は以下の通り。予備知識無しでも内容が想像できるシンプルなコードだ。

# vi spec/localhost/sample_spec.rb
require 'spec_helper'

describe package('httpd'), :if => os[:family] == 'redhat' do
  it { should be_installed }
end

describe package('apache2'), :if => os[:family] == 'ubuntu' do
  it { should be_installed }
end

describe service('httpd'), :if => os[:family] == 'redhat' do
  it { should be_enabled }
  it { should be_running }
end

describe service('apache2'), :if => os[:family] == 'ubuntu' do
  it { should be_enabled }
  it { should be_running }
end

describe service('org.apache.httpd'), :if => os[:family] == 'darwin' do
  it { should be_enabled }
  it { should be_running }
end

describe port(80) do
  it { should be_listening }
endて

# vi spec/localhost/sample_spec.rb

require 'spec_helper'

describe package('httpd'), :if => os[:family] == 'redhat' do

it { should be_installed }

end

describe package('apache2'), :if => os[:family] == 'ubuntu' do

it { should be_installed }

end

describe service('httpd'), :if => os[:family] == 'redhat' do

it { should be_enabled }

it { should be_running }

end

describe service('apache2'), :if => os[:family] == 'ubuntu' do

it { should be_enabled }

it { should be_running }

end

describe service('org.apache.httpd'), :if => os[:family] == 'darwin' do

it { should be_enabled }

it { should be_running }

end

describe port(80) do

it { should be_listening }

endて

テストを実行すると全て成功。

# rake
/opt/rbenv/versions/2.6.0/bin/ruby -I/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-support-3.12.1/lib:/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/lib /opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/exe/rspec --pattern spec/localhost/\*_spec.rb

Package "httpd"
  is expected to be installed

Service "httpd"
  is expected to be enabled
  is expected to be running

Port "80"
  is expected to be listening

Finished in 0.13819 seconds (files took 0.56471 seconds to load)
4 examples, 0 failures

# rake

/opt/rbenv/versions/2.6.0/bin/ruby -I/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-support-3.12.1/lib:/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/lib /opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/exe/rspec --pattern spec/localhost/\*_spec.rb

Package "httpd"

is expected to be installed

Service "httpd"

is expected to be enabled

is expected to be running

Port "80"

is expected to be listening

Finished in 0.13819 seconds (files took 0.56471 seconds to load)

4 examples, 0 failures

Apacheを停止して再度テストを実行したら、今度はきちんと失敗した。

# service httpd stop
# service httpd status
# rake
/opt/rbenv/versions/2.6.0/bin/ruby -I/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-support-3.12.1/lib:/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/lib /opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/exe/rspec --pattern spec/localhost/\*_spec.rb

Package "httpd"
  is expected to be installed

Service "httpd"
  is expected to be enabled
  is expected to be running (FAILED - 1)

Port "80"
  is expected to be listening (FAILED - 2)

Failures:

  1) Service "httpd" is expected to be running
     On host `localhost'
     Failure/Error: it { should be_running }
       expected Service "httpd" to be running
       /bin/sh -c systemctl\ is-active\ httpd
       inactive

     # ./spec/localhost/sample_spec.rb:13:in `block (2 levels) in <top (required)>'

  2) Port "80" is expected to be listening
     On host `localhost'
     Failure/Error: it { should be_listening }
       expected Port "80" to be listening
       /bin/sh -c ss\ -tunl\ \|\ grep\ -E\ --\ :80\\\

     # ./spec/localhost/sample_spec.rb:27:in `block (2 levels) in <top (required)>'

Finished in 0.0979 seconds (files took 0.58659 seconds to load)
4 examples, 2 failures

Failed examples:

rspec ./spec/localhost/sample_spec.rb:13 # Service "httpd" is expected to be running
rspec ./spec/localhost/sample_spec.rb:27 # Port "80" is expected to be listening

/opt/rbenv/versions/2.6.0/bin/ruby -I/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-support-3.12.1/lib:/opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/lib /opt/rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/rspec-core-3.12.2/exe/rspec --pattern spec/localhost/\*_spec.rb failed

# service httpd stop

# service httpd status

# rake

Package "httpd"

is expected to be installed

Service "httpd"

is expected to be enabled

is expected to be running (FAILED - 1)

Port "80"

is expected to be listening (FAILED - 2)

Failures:

1) Service "httpd" is expected to be running

On host `localhost'

Failure/Error: it { should be_running }

expected Service "httpd" to be running

/bin/sh -c systemctl\ is-active\ httpd

inactive

# ./spec/localhost/sample_spec.rb:13:in `block (2 levels) in <top (required)>'

2) Port "80" is expected to be listening

On host `localhost'

Failure/Error: it { should be_listening }

expected Port "80" to be listening

/bin/sh -c ss\ -tunl\ \|\ grep\ -E\ --\ :80\\\

# ./spec/localhost/sample_spec.rb:27:in `block (2 levels) in <top (required)>'

Finished in 0.0979 seconds (files took 0.58659 seconds to load)

4 examples, 2 failures

Failed examples:

rspec ./spec/localhost/sample_spec.rb:13 # Service "httpd" is expected to be running

rspec ./spec/localhost/sample_spec.rb:27 # Port "80" is expected to be listening

なかなか良さげなツールだ。ただ、自分にとってはアプリでRubyを使っていない環境に、テスト用途だけでRubyをインストールするのがちょっと重荷かもしれない。

参考サイト

Serverspec – Home
https://serverspec.org/

「Serverspec」を使ってサーバー環境を自動テストしよう | さくらのナレッジ
https://knowledge.sakura.ad.jp/2596/
2022-03-10

Serverspec のインストールと基本的な使い方 – Qiita
https://qiita.com/Tocyuki/items/5ce5250407da48886e45
2017-06-02

テスト環境

セットアップ

参考サイト

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