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How to solve Lost connection to MySQL server at 'reading initial communication packet', system error: 0 Question

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screenshot of text after rails db:create

screenshot of text

Lost connection to MySQL server at 'reading initial communication packet', syste      m error: 0
Couldn't create 'qpixel_dev' database. Please check your configuration.
rails aborted!
Mysql2::Error::ConnectionError: Lost connection to MySQL server at 'reading init      ial communication packet', system error: 0
/usr/share/rvm/gems/ruby-2.6.6/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `con      nect'
/usr/share/rvm/gems/ruby-2.6.6/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `ini      tialize'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/mysql2_adapter.rb:22:in `new'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/mysql2_adapter.rb:22:in `mysql2_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:830:in `new_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:874:in `checkout_new_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:853:in `try_to_checkout_new_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:814:in `acquire_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:538:in `checkout'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:382:in `connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_adapters/abstract/connection_pool.rb:1033:in `retrieve_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_handling.rb:118:in `retrieve_connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/connect      ion_handling.rb:90:in `connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/m      ysql_database_tasks.rb:6:in `connection'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/m      ysql_database_tasks.rb:14:in `create'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/d      atabase_tasks.rb:119:in `create'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/d      atabase_tasks.rb:139:in `block in create_current'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/d      atabase_tasks.rb:316:in `block in each_current_configuration'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/d      atabase_tasks.rb:313:in `each'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/d      atabase_tasks.rb:313:in `each_current_configuration'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/tasks/d      atabase_tasks.rb:138:in `create_current'
/usr/share/rvm/gems/ruby-2.6.6/gems/activerecord-5.2.6/lib/active_record/railtie      s/databases.rake:29:in `block (2 levels) in <top (required)>'
/usr/share/rvm/gems/ruby-2.6.6/gems/railties-5.2.6/lib/rails/commands/rake/rake_      command.rb:23:in `block in perform'
/usr/share/rvm/gems/ruby-2.6.6/gems/railties-5.2.6/lib/rails/commands/rake/rake_      command.rb:20:in `perform'
/usr/share/rvm/gems/ruby-2.6.6/gems/railties-5.2.6/lib/rails/command.rb:48:in `i      nvoke'
/usr/share/rvm/gems/ruby-2.6.6/gems/railties-5.2.6/lib/rails/commands.rb:18:in `      <top (required)>'
/root/qpixel/bin/rails:9:in `require'
/root/qpixel/bin/rails:9:in `<top (required)>'
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/lib/spring/client/rails.rb:28:i      n `load'
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/lib/spring/client/rails.rb:28:i      n `call'
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/lib/spring/client/command.rb:7:      in `call'
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/lib/spring/client.rb:30:in `run      '
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/bin/spring:49:in `<top (require      d)>'
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/lib/spring/binstub.rb:11:in `lo      ad'
/usr/share/rvm/gems/ruby-2.6.6/gems/spring-2.1.1/lib/spring/binstub.rb:11:in `<t      op (required)>'
/root/qpixel/bin/spring:13:in `require'
/root/qpixel/bin/spring:13:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
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2 answers

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You forgot to turn on mysql.

sudo systemctl enable mysql

systemctl doesn't work for every distro. If your system doesn't have systemctl then, you have to use service

sudo service mysql enable

Sometimes only enabling mysql service isn't helpful. Then, you have to login to mysql once.

mysql -u root -p

It will request you to enter password. Then, enter your password. Then, you can exit if you want. Then, try creating database again.

rails db:create
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nothing change ! I try everthing. (15 comments)
installation (3 comments)
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test

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