Capistrano導入がうまくいかない Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

Question

00:12 deploy:migrating
      01 $HOME/.rbenv/bin/rbenv exec bundle exec rake db:migrate
      01 rake aborted!
      01 Mysql2::Error::ConnectionError: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `connect'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `initialize'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `new'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `mysql2_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:830:in `new_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:874:in `checkout_new_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:853:in `try_to_checkout_new_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:814:in `acquire_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:538:in `checkout'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:382:in `connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:1033:in `retrieve_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_handling.rb:118:in `retrieve_connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_handling.rb:90:in `connection'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/tasks/database_tasks.rb:172:in `migrate'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/railties/databases.rake:60:in `block (2 levels) in <top (required)>'
      01 /var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
      01 /home/ec2-user/.rbenv/versions/2.5.1/bin/bundle:23:in `load'
      01 /home/ec2-user/.rbenv/versions/2.5.1/bin/bundle:23:in `<main>'
      01 Tasks: TOP => db:migrate
      01 (See full trace by running task with --trace)
#<Thread:0x00007ff75f06c378@/Users/handaryouhei/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:10 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
	1: from /Users/handaryouhei/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:11:in `block (2 levels) in execute'
/Users/handaryouhei/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:15:in `rescue in block (2 levels) in execute': Exception while executing as ec2-user@54.250.55.251: rake exit status: 1 (SSHKit::Runner::ExecuteError)
rake stdout: Nothing written
rake stderr: rake aborted!
Mysql2::Error::ConnectionError: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `connect'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `initialize'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `new'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `mysql2_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:830:in `new_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:874:in `checkout_new_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:853:in `try_to_checkout_new_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:814:in `acquire_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:538:in `checkout'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:382:in `connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:1033:in `retrieve_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_handling.rb:118:in `retrieve_connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/connection_handling.rb:90:in `connection'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/tasks/database_tasks.rb:172:in `migrate'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/activerecord-5.2.4.1/lib/active_record/railties/databases.rake:60:in `block (2 levels) in <top (required)>'
/var/www/cheaptweet/shared/bundle/ruby/2.5.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/home/ec2-user/.rbenv/versions/2.5.1/bin/bundle:23:in `load'
/home/ec2-user/.rbenv/versions/2.5.1/bin/bundle:23:in `<main>'
Tasks: TOP => db:migrate

以下省略

あらゆる再起動はしました。
config/database.ymlでsoketを指定しているのが、

default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password:
  socket: /var/lib/mysql/mysql.sock

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

の2箇所あって前者は関係ないと思うのですが、一応変えてみました。
これ以外にプロジェクト内に/tmp/mysql.sockの記載は無いです。

よろしくお願いいたします。。。

Answer 1

config/deploy.rbにブランチ名を指定していなかったからでした。（今回masterじゃない）

set :branch, 'ブランチ名'を追記しました。