AWSでunicornが起動できない

Question

bundle exec unicorn_rails -c config/unicorn.conf.rb -E production -D

をすると

bundler: failed to load command: unicorn_rails (/home/ec2-user/.rbenv/versions/2.5.1/bin/unicorn_rails)
Errno::ENOENT: No such file or directory @ rb_sysopen - config/unicorn.conf.rb
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:84:in `read'
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:84:in `reload'
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:77:in `initialize'
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:77:in `new'
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:77:in `initialize'
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/bin/unicorn_rails:209:in `new'
  /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/bin/unicorn_rails:209:in `<top (required)>'
  /home/ec2-user/.rbenv/versions/2.5.1/bin/unicorn_rails:23:in `load'
  /home/ec2-user/.rbenv/versions/2.5.1/bin/unicorn_rails:23:in `<top (required)>'
master failed to start, check stderr log for details

です。
database.ymlをみましたが、以下です。

# MySQL. Versions 5.0 and up are supported.
#
# Install the MySQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.7/en/old-client.html
#
default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password:
  socket: /tmp/mysql.sock

development:
  <<: *default
  database: chat-space_development

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: chat-space_test

# As with config/secrets.yml, you never want to store sensitive information,
# like your database password, in your source code. If your source code is
# ever seen by anyone, they now have access to your database.
#
# Instead, provide the password as a unix environment variable when you boot
# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
# for a full rundown on how to provide these environment variables in a
# production deployment.
#
# On Heroku and other platform providers, you may have a full connection URL
# available as an environment variable. For example:
#
#   DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase"
#
# You can use this database configuration with:
#
#   production:
#     url: <%= ENV['DATABASE_URL'] %>
#

production:
  <<: *default
  database: chat-space_production
  username: root
  password: <%= ENV['DATABASE_PASSWORD'] %>
  socket: /var/lib/mysql/mysql.sock

less log/unicorn.stderr.logをすると

E, [2019-11-26T13:48:32.524456 #28740] ERROR -- : Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) (Mysql2::Error::ConnectionError)

となります。
もともとは普通に起動していて、一度unicornをkillして再起動しようとしたら、こうなってしまいました。。

Answer 1

gemのCapistranoが権限のじゃまをしていたそうです。
Capistranoのデプロイ方法もうまくいかなかったのですが、もう一度行うと
https://gyazo.com/22b81093032b255f9753d974ca49987d
と言われたので、そうしたら解決しました！

Answer 2

No such file or directory @ rb_sysopen - config/unicorn.conf.rb
というメッセージが気になります。

Rails.rootにcdして起動していますか？

追記
そこに　config/unicorn.conf.rb　はありますか？

Comments

[annaPanda]

正しくは
```
bundle exec unicorn_rails -c config/unicorn.conf.rb -E production -D
```
ではなく
```
bundle exec unicorn_rails -c config/unicorn.rb -E production -D
```
ですかね？
後者でやると、
```
bundler: failed to load command: unicorn_rails (/home/ec2-user/.rbenv/versions/2.5.1/bin/unicorn_rails)
ArgumentError: config_file=config/unicorn.rb would not be accessible in working_directory=/var/www/current
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:592:in `working_directory'
config/unicorn.rb:8:in `reload'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:84:in `instance_eval'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:84:in `reload'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:77:in `initialize'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:77:in `new'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/lib/unicorn/http_server.rb:77:in `initialize'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/bin/unicorn_rails:209:in `new'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-5.4.1/bin/unicorn_rails:209:in `<top (required)>'
/home/ec2-user/.rbenv/versions/2.5.1/bin/unicorn_rails:23:in `load'
/home/ec2-user/.rbenv/versions/2.5.1/bin/unicorn_rails:23:in `<top (required)>'
master failed to start, check stderr log for details
```
になります、、、
>Rails.rootにcdして　　の意味がすみませんわからないのですが、EC2内の今回のプロジェクトの一番上のディレクトリーにいますが。。。（答えになっていますか？）

[winterboum]

そのdirにGemfileとか app/　とかありますか？
それがある所が Rails.rootです

[annaPanda]

なるほど、であればもちろんRails.rootにcdしてのコマンドです！
後者でやるとArgumentErrorとでていて引数の間違いのようですが、引数がどう関係有るのかわかりません。。。

[annaPanda]

ないです。すみません。なので上の通り、
```
bundle exec unicorn_rails -c config/unicorn.conf.rb -E production -D
```
ではなく
```
bundle exec unicorn_rails -c config/unicorn.rb -E production -D
```
に打ち直しました。