Rails6アプリのデータベースをSQliteからMySQLに変更したい

Question

Rails6アプリのデータベースをSQliteからMySQLに変更したい

現在作成中のRailsアプリをAWSへデプロイするためにデータベースを
SQliteからMySQLに変更したいのですが
エラーが発生し先に進めず困っております。
ご教授いただける方がいらっしゃれば教えていただけると幸いです。

###実行環境

ProductName:    macOS
ProductVersion: 11.2.1
ruby 2.7.2
Rails 6.0.3

試したこと

この記事などを参考に進めました

①MySQLへ変更

$ rails db:system:change --to=mysql
    conflict  config/database.yml
Overwrite /Users/name/appName/config/database.yml? (enter "h" for help) [Ynaqdhm] y
       force  config/database.yml
        gsub  Gemfile
        gsub  Gemfile

上記コマンドにより変化したGemfile

#コマンド実行前
group :development, :test do
  gem 'sqlite3', '1.4.1'
end

group :production do
  gem 'pg', '1.1.4'
end

#コマンド実行後
group :development, :test do
  gem 'mysql2', '1.4.1'
end

group :production do
  gem 'mysql2', '1.1.4'
end

database.ymlの変化

#コマンド前
default: &default
  adapter: sqlite3
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
  <<: *default
  database: db/development.sqlite3
 
test:
  <<: *default
  database: db/test.sqlite3

production:
  <<: *default
  database: db/production.sqlite3

#コマンド実行後
default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password:
  socket: /tmp/mysql.sock

development:
  <<: *default
  database: [appName]_development

test:
  <<: *default
  database: [appName]_test

production:
  <<: *default
  database: [appName]_production
  username: [appName]
  password: <%= ENV['[APPNAME]_DATABASE_PASSWORD'] %>

エラーメッセージ

$ bundle install

[!] There was an error parsing `Gemfile`: You cannot specify the same gem twice with different version requirements.
You specified: mysql2 (= 1.4.1) and mysql2 (= 1.1.4). Bundler cannot continue.

 #  from /Gemfile:49
 #  -------------------------------------------
 #  group :production do
 >    gem 'mysql2', '1.1.4'
 #  end
 #  -------------------------------------------

###Gemfileの変更(バージョンの指定をなくす)

group :development, :test do
  gem 'mysql2'
end

group :production do
  gem 'mysql2'
end

###パスを通す

$ bundle config --local build.mysql2 "--with-cppflags=-I/usr/local/opt/openssl/include"
#または
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib"
#または
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"

エラーメッセージ

上記のどのパターンのパスを指定しても
下記のエラーが発生してしまいます。

$ bundle install

・・・
Fetching mysql2 0.5.3
Installing mysql2 0.5.3 with native extensions
Errno::EACCES: Permission denied @ rb_sysopen - /Users/username/appname/vendor/bundle/ruby/2.7.0/gems/mysql2-0.5.3/CHANGELOG.md
An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  mysql2

###Gemのインストール
エラーメッセージ通りにgemをインストールしてみる

$ sudo gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'

Building native extensions. This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.

    current directory: /Users/username/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/ext/mysql2
/Users/username/.rbenv/versions/2.7.2/bin/ruby -I /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0 -r ./siteconf20210307-39936-1kuenmr.rb extconf.rb
checking for rb_absint_size()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/Users/username/.rbenv/versions/2.7.2/bin/$(RUBY_BASE_NAME)
/Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:471:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:564:in `try_link0'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:582:in `try_link'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:794:in `try_func'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:1083:in `block in have_func'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:971:in `block in checking_for'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:361:in `block (2 levels) in postpone'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:331:in `open'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:361:in `block in postpone'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:331:in `open'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:357:in `postpone'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:970:in `checking_for'
        from /Users/username/.rbenv/versions/2.7.2/lib/ruby/2.7.0/mkmf.rb:1082:in `have_func'
        from extconf.rb:25:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/username/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/extensions/x86_64-darwin-20/2.7.0/mysql2-0.5.3/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/username/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3 for inspection.
Results logged to /Users/username/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/extensions/x86_64-darwin-20/2.7.0/mysql2-0.5.3/gem_make.out

ヒントだけでもいいので、わかる方教えて頂きたいです。
よろしくお願い致します。

Comments

[m.ts10806]

そもそもMySQL自体のインストールとログイン確認はされてますか？

Answer 1

You have to install development tools first
とあります。
mysql2 のinstallにはCのheaderファイルなどが必要で、それは mysqlの開発環境にあります。ということで You have to install development tools first
sudo yum install mysql-devel　で。