Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /home/ec2-user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.3/ext/mysql2
/home/ec2-user/.rbenv/versions/2.6.5/bin/ruby -I /home/ec2-user/.rbenv/versions/2.6.5/lib/ruby/2.6.0 -r ./siteconf20210403-11662-qkup4a.rb extconf.rb
--with-ldflags\=-L/usr/local/opt/openssl/lib
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_wait_for_single_fd()... yes
checking for -lmysqlclient... no
-----
mysql client is missing. You may need to 'sudo apt-get install libmariadb-dev', 'sudo apt-get install libmysqlclient-dev' or 'sudo yum install mysql-devel', and try again.
-----
*** 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=/home/ec2-user/.rbenv/versions/2.6.5/bin/$(RUBY_BASE_NAME)
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/lib
--with-mysql-config
--without-mysql-config
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/lib
--with-mysqlclientlib
--without-mysqlclientlib
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/home/ec2-user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/extensions/x86_64-linux/2.6.0/mysql2-0.5.3/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /home/ec2-user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mysql2-0.5.3 for inspection.
Results logged to /home/ec2-user/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/extensions/x86_64-linux/2.6.0/mysql2-0.5.3/gem_make.out
An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'` succeeds before bundling.
仮説(考えたこと）
mysql2 0.5.3 をインストールできないよっていうエラー内容
以下のエラー文からパッケージ関係のエラーであることがわかった
mysql client is missing. You may need to 'sudo apt-get install libmariadb-dev', 'sudo apt-get install libmysqlclient-dev' or 'sudo yum install mysql-devel', and try again.
#!/bin/bashset-e# Remove a potentially pre-existing server.pid for Rails.rm-f /myapp/tmp/pids/server.pid
# Then exec the container's main process (what's set as CMD in the Dockerfile).exec"$@"
ActiveRecord::ConnectionNotEstablished (could not translate host name "db" to address: nodename nor servname provided, or not known)
原因
Docker経由のRailsコンソールではなく、ローカルのRialsコンソールで操作していた。
対処法
Dockerコンテナに入ってから、Rialsコンソールを起動する。
#コンテナ名の確認
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
588188913f4c rails6-docker-alpine_web "bin/rails s -p 3000…" 3 hours ago Up 3 hours 0.0.0.0:3000->3000/tcp rails6-docker-alpine_web_1
6a965250e960 postgres:11.1-alpine "docker-entrypoint.s…" 20 hours ago Up 3 hours 5432/tcp rails6-docker-alpine_db_1
railsアプリケーションはrails6-docker-alpine_web_1。
コンテナに入る: docker exec -it <コンテナ名> sh
(railsの場合はsh。 laravelなどはbash。)
#コンテナ内に入る
$ docker exec -it rails6-docker-alpine_web_1 sh
#railsコンソールの起動
/usr/src/app # rails c
Running via Spring preloader in process 130
Loading development environment (Rails 6.1.3.1)
irb(main):001:0>
#>
irb(main):004:0> User.find(1)
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
=> #<User id: 1, name: "aaabbb", created_at: "2021-04-03 07:35:30.551136000 +0000", updated_at: "2021-04-03 07:53:48.907671000 +0000">
#!/bin/bashset-e# Remove a potentially pre-existing server.pid for Rails.rm-f /myapp/tmp/pids/server.pid
# Then exec the container's main process (what's set as CMD in the Dockerfile).exec"$@"
require'base64'str='Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4gUnVieQ=='putsBase64.decode64(str)#=> "Now is the time for all good coders\nto learn Ruby"
encode64
与えられた文字列をBase64エンコードしたデータで返します。
require'base64'str="Now is the time for all good coders\nto learn Ruby"Base64.encode64(str)#=> Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4gUnVieQ==
config.file_watcher=ActiveSupport::EventedFileUpdateChecker# Uncomment if you wish to allow Action Cable access from any origin.# config.action_cable.disable_request_forgery_protection = trueconfig.hosts.clear#追加しますend
Font Awesomeとは、自身のウェブサイトやアプリケーション、WordやPDFなどのドキュメントにも埋め込めるWebアイコンフォントのことで商用利用もできます。
FontAwesomeの導入
まずはgemを編集します
gemfile
gem 'font-awesome-rails'
忘れずにbundle installをしましょう
ターミナル
$ bundle install
最後にapplication.scssを編集します
application.scss
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
* vendor/assets/stylesheets directory can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the bottom of the
* compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
* files in this directory. Styles in this file should be added after the last require_* statement.
* It is generally better to create a new file per style scope.
*
*= require_tree .
*= require_self
*//*
*/@import"bootstrap";//↓ 追加@import"font-awesome";
# PostgreSQL. Versions 9.3 and up are supported.
#
# Install the pg driver:
# gem install pg
# On macOS with Homebrew:
# gem install pg -- --with-pg-config=/usr/local/bin/pg_config
# On macOS with MacPorts:
# gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
# On Windows:
# gem install pg
# Choose the win32 build.
# Install PostgreSQL and put its /bin directory on your path.
#
# Configure Using Gemfile
# gem 'pg'
#
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
* vendor/assets/stylesheets directory can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the bottom of the
* compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
* files in this directory. Styles in this file should be added after the last require_* statement.
* It is generally better to create a new file per style scope.
*
*= require_tree .
*= require_self
*//*
*/// ↓追加@import"bootstrap";
scssファイルではインポートに@importを使うので注意
最後にapplication.jsを変更して終わりです
app/assets/javascripts/application.js
// This file is automatically compiled by Webpack, along with any other files// present in this directory. You're encouraged to place your actual application logic in// a relevant structure within app/javascript and only use these pack files to reference// that code so it'll be compiled.importRailsfrom"@rails/ujs"importTurbolinksfrom"turbolinks"import*asActiveStoragefrom"@rails/activestorage"import"channels"Rails.start()Turbolinks.start()ActiveStorage.start()// ↓追加//=require bootstraprequire('jquery')
// This file is automatically compiled by Webpack, along with any other files// present in this directory. You're encouraged to place your actual application logic in// a relevant structure within app/javascript and only use these pack files to reference// that code so it'll be compiled.importRailsfrom"@rails/ujs"importTurbolinksfrom"turbolinks"import*asActiveStoragefrom"@rails/activestorage"import"channels"Rails.start()Turbolinks.start()ActiveStorage.start()// ↓追加require('jquery')
