在 Elastic Beanstalk 环境上部署 ruby​​ on rails 应用程序时出现 AWS 数据库迁移错误

Question

当我尝试通过 AWS Elastic Beanstalk 环境部署我的 RoR 应用程序时，我在控制台上收到以下错误：

ERROR: [Instance: i-0c1d25d2a182d8424] Command failed on instance. Return code: 1 Output: (TRUNCATED)...ly and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
/opt/rubies/ruby-2.5.0/bin/bundle:23:in `load'
/opt/rubies/ruby-2.5.0/bin/bundle:23:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace). 
Hook /opt/elasticbeanstalk/hooks/appdeploy/pre/12_db_migration.sh failed. For more detail, check /var/log/eb-activity.log using console or EB CLI.
INFO: Command execution completed on all instances. Summary: [Successful: 0, Failed: 1].
ERROR: Unsuccessful command execution on instance id(s) 'i-0c1d25d2a182d8424'. Aborting the operation.
ERROR: Failed to deploy application.  

以下是我在database.yml中的配置

production:
  <<: *default
  database: <%= ENV['RDS_DB_NAME'] %>
  username: <%= ENV['RDS_USERNAME'] %>
  host: <%= ENV['RDS_HOSTNAME'] %>
  password: <%= ENV['RDS_PASSWORD'] %>
  port: <%= ENV['RDS_PORT'] %>

以下是日志中报告的错误：

  ++ export RUBY_ROOT=/opt/rubies/ruby-2.5.0
  ++ RUBY_ROOT=/opt/rubies/ruby-2.5.0
  ++ export RUBYOPT=
  ++ RUBYOPT=
  ++ export PATH=/opt/rubies/ruby-2.5.0/bin:/opt/elasticbeanstalk/lib/ruby/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
  ++ PATH=/opt/rubies/ruby-2.5.0/bin:/opt/elasticbeanstalk/lib/ruby/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
  +++ /opt/rubies/ruby-2.5.0/bin/ruby -
  ++ eval 'export RUBY_ENGINE=ruby;
  export RUBY_VERSION=2.5.0;
  export GEM_ROOT="/opt/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0";'
  +++ export RUBY_ENGINE=ruby
  +++ RUBY_ENGINE=ruby
  +++ export RUBY_VERSION=2.5.0
  +++ RUBY_VERSION=2.5.0
  +++ export GEM_ROOT=/opt/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0
  +++ GEM_ROOT=/opt/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0
  ++ ((  0 != 0  ))
  + cd /var/app/ondeck
  + su -s /bin/bash -c 'bundle exec /opt/elasticbeanstalk/support/scripts/check-for-rake-task.rb db:migrate' webapp
  `/home/webapp` is not a directory.
  Bundler will use `/tmp/bundler/home/webapp' as your home directory temporarily.
  + '[' false = true ']'
  + su -s /bin/bash -c 'leader_only bundle exec rake db:migrate' webapp
  `/home/webapp` is not a directory.
  Bundler will use `/tmp/bundler/home/webapp' as your home directory temporarily.
  rake aborted!
  PG::ConnectionBad: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
  /opt/rubies/ruby-2.5.0/bin/bundle:23:in `load'
  /opt/rubies/ruby-2.5.0/bin/bundle:23:in `<main>'
  Tasks: TOP => db:migrate
  (See full trace by running task with --trace) (Executor::NonZeroExitStatus) 

另外，rake db:migrate 在本地也能正常工作。我不知道这里会发生什么，对于数据库，我尝试导入我已经在 AWS RDS 上拥有的数据库实例的快照，但我也尝试创建一个新数据库。

如果您对这里可能发生的事情有任何想法，如果您能告诉我，将不胜感激。

提前致谢。

Answer 1

作为您的评论，我相信您错过了在 Elastic Beanstalk 中配置 RDS_*。要解决这个问题：

1. 要配置所有 RDS_*，请在此处遵循此指南：https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-cfg-softwaresettings.html#environments-cfg-softwaresettings-console。
2. 重新部署您的应用程序。