将 mongoDB 迁移到 AWS DocumentDB db on rails 无法创建索引

Question

我正在尝试从 mongo DB 迁移到 AWS documentDB on rails。 我更改了 mongoid.yml 的配置以指向记录的实例（在主机下）

运行 rake:db:mongoid:create_indexes 时出现以下错误：

rake aborted!
Mongo::Error::NoServerAvailable: No server is available matching preference: #<Mongo::ServerSelector::Primary:0x139580660 tag_sets=[] max_staleness=nil> using server_selection_timeout=60 and local_threshold=0.015
/usr/local/bundle/gems/mongo-2.6.2/lib/mongo/server_selector/selectable.rb:115:in `select_server'
/usr/local/bundle/gems/mongo-2.6.2/lib/mongo/cluster.rb:263:in `next_primary'
/usr/lib/ruby/2.3.0/forwardable.rb:202:in `next_primary'
/usr/local/bundle/gems/mongo-2.6.2/lib/mongo/index/view.rb:151:in `create_many'
/usr/local/bundle/gems/mongo-2.6.2/lib/mongo/index/view.rb:130:in `create_one'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/indexable.rb:37:in `block in create_indexes'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/indexable.rb:31:in `each'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/indexable.rb:31:in `create_indexes'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/tasks/database.rb:20:in `block in create_indexes'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/tasks/database.rb:17:in `each'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/tasks/database.rb:17:in `create_indexes'
/usr/local/bundle/gems/mongoid-5.4.0/lib/mongoid/tasks/database.rake:8:in `block (3 levels) in <top (required)>'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/task.rb:273:in `block in execute'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/task.rb:273:in `each'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/task.rb:273:in `execute'
/usr/local/bundle/gems/airbrake-9.5.0/lib/airbrake/rake.rb:17:in `execute'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/task.rb:214:in `block in invoke_with_call_chain'
/usr/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/task.rb:194:in `invoke_with_call_chain'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/task.rb:183:in `invoke'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:160:in `invoke_task'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:116:in `each'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:116:in `block in top_level'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:125:in `run_with_threads'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:110:in `top_level'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:83:in `block in run'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:186:in `standard_exception_handling'
/usr/local/bundle/gems/rake-12.3.2/lib/rake/application.rb:80:in `run'
/usr/local/bundle/gems/rake-12.3.2/exe/rake:27:in `<top (required)>'
/usr/local/bundle/bin/rake:23:in `load'
/usr/local/bundle/bin/rake:23:in `<main>'
Tasks: TOP => db:mongoid:create_indexes

安装 ruby 宝石：

mongo (2.6.2)
mongoid (5.4.0)

我是否缺少一些 gem 安装？ 是不是还不支持不能迁移ATM？

Answer 1

您的应用程序无法连接到数据库。

我错过了一些 gem 安装吗？

不，但是您使用的是相当旧的驱动程序（尽管您正在使用的 MongoDB 维护 MongoDB Ruby 驱动程序不支持将其与 DocumentDB 一起使用，无论版本如何）。

它还不支持因此无法迁移 ATM 吗？

您还没有到达尝试创建索引的位置。

Answer 2

Ruby 的 MongoDB 驱动程序应该可以与 Amazon DocumentDB 一起使用。 您是否检查了安全组配置并配置了证书？ DocumentDB 只能从同一 VPC 访问，并且默认启用 TLS。 文档中有关于如何以编程方式连接的代码示例。