Question

我在使用以下脚本时遇到了一些问题：

require 'rubygems'
require 'active_record'
require 'net/ssh/gateway'

gateway = Net::SSH::Gateway.new('myserver.com', 'myuser', :password => "mypass")
puts "true" if gateway.active?
p = gateway.open('127.0.0.1', 3306, 3307)

class MyClass < ActiveRecord::Base
  establish_connection(
    :adapter  => "mysql",
    :host     => "127.0.0.1",
    :username => "db_user",
    :password => "db_pass",
    :database => "mydb_production",
    :port     => 3307
  )
end

puts MyClass.all.size

gateway.shutdown!

当我运行脚本时它会挂起，除非我删除了activerecord查询。我知道我可以使用隧道连接，因为我可以从命令创建隧道，如下所示：

ssh -f myuser@myserver.com -L 3307/127.0.0.1/3306 -N

然后如果我跑：

require 'rubygems'
require 'active_record'

class MyClass < ActiveRecord::Base
  establish_connection(
    :adapter  => "mysql",
    :host     => "127.0.0.1",
    :username => "db_user",
    :password => "db_pass",
    :database => "mydb_production",
    :port     => 3307
  )
end

puts MyClass.all.size

工作正常。我做错了什么？

感谢。

Answer 1

通过使用mysql2 gem

，我能够在没有fork的情况下使用它

require 'rubygems'
require 'active_record'
require 'mysql2'
require 'net/ssh/gateway'

gateway = Net::SSH::Gateway.new(
  'remotehost.com',
  'username'
)
port = gateway.open('127.0.0.1', 3306, 3307)

class Company < ActiveRecord::Base
  establish_connection(
    :adapter  => "mysql2",
    :host     => "127.0.0.1",
    :username => "dbuser",
    :password => "dbpass",
    :database => "dbname",
    :port     => 3307
  )
end
puts Company.all.size

Answer 2

我认为评论是对的 - 数据库与ssh代码中的事件循环冲突。

试试这个：

  require 'rubygems'
  require 'active_record'
  require 'net/ssh/gateway'

  gateway = Net::SSH::Gateway.new('myserver.com', 'myuser', :password => "mypass")
  puts "true" if gateway.active?
  port = gateway.open('127.0.0.1', 3306, 3307)
  fork.do
    class MyClass < ActiveRecord::Base
      establish_connection(
        :adapter  => "mysql",
        :host     => "127.0.0.1",
        :username => "db_user",
        :password => "db_pass",
        :database => "mydb_production",
        :port     => 3307
      )
    end

    puts MyClass.all.size
  end  

  Process.wait

  gateway.shutdown!

无法使用ssh tunnel和activerecord连接到远程数据库

2 个答案: