[英]Is it possible to directly connect to a Heroku database from localhost?
如果我有DATABASE_URL,是否可以從localhost連接到它? 我正在使用以下代碼:
db = URI.parse(database_url)
connection = ActiveRecord::Base.establish_connection(
:adapter => db.scheme == 'postgres' ? 'postgresql' : db.scheme,
:host => db.host,
:username => db.user,
:password => db.password,
:database => db.path[1..-1],
:encoding => 'utf8'
)
從我的電腦運行代碼時,我不斷收到如下錯誤:
could not connect to server: Connection timed out
Is the server running on host some_host.amazonaws.com and accepting
TCP/IP connections on port 5432?
我使用相同的代碼在Heroku上運行的兩個應用程序之間共享數據庫並且它可以工作。 這使我相信除非您從Heroku主機執行,否則連接到Heroku數據庫是受限制的。 真的嗎?
實際上,外部連接需要SSL。 可以強制底層postgres適配器使用SSL與sslmode=require
參數。 您可以從ActiveRecord連接選項中傳遞任意參數,如下所示:
ActiveRecord::Base.establish_connection(
adapter: 'postgresql',
host: 'host',
username: 'user',
password: 'pass',
database: 'database_name',
encoding: 'utf-8',
port: '5432', # could be a non-standard port
sslmode: 'require' # force SSL
)
我在本地驗證了這一點,這是一個完整的會話,顯示它的工作原理。 請確保您沒有錯誤輸入任何內容:
heroku pg:credentials yellow -a my-app Connection info string:
"dbname=ddbolrs4g89dsi host=ec2-23-21-91-108.compute-1.amazonaws.com port=5432 user=itkdrxzjmwcjtw password=wU-4tT3YbF8AZ3U5kwu-2KYPEX ssl
mode=require"
$ irb
> require 'active_record'
=> true
> ActiveRecord::Base.establish_connection(adapter: 'postgresql', database: 'ddbolrs4g89dsi', host: 'ec2-23-21-91-108.compute-1.amazonaws.com', username: 'itkdrxzjmwcjtw', password: 'wU-4tT3YbF8AZ3U5kwu-2KYPEX', sslmodel: 'require')
=> #<ActiveRecord::ConnectionAdapters::ConnectionPool:0x007f7f9ba6f0f0 @mon_owner=nil, @mon_count=0, @mon_mutex=#<Mutex:0x007f7f9ba6f078>, @spec=#<ActiveRecord::Base::ConnectionSpecification:0x007f7f9ba64150 @config={:adapter=>"postgresql", :database=>"ddbolrs4g89dsi", :host=>"ec2-23-21-91-108.compute-1.amazonaws.com", :username=>"itkdrxzjmwcjtw", :password=>"wU-4tT3YbF8AZ3U5kwu-2KYPEX", :sslmodel=>"require"}, @adapter_method="postgresql_connection">, @reserved_connections={}, @queue=#<MonitorMixin::ConditionVariable:0x007f7f9ba6f000 @monitor=#<ActiveRecord::ConnectionAdapters::ConnectionPool:0x007f7f9ba6f0f0 ...>, @cond=#<ConditionVariable:0x007f7f9ba6efd8 @waiters=[], @waiters_mutex=#<Mutex:0x007f7f9ba6ef88>>>, @timeout=5, @size=5, @connections=[], @automatic_reconnect=true>
> ActiveRecord::Base.connection.execute("SELECT version()").first
=> {"version"=>"PostgreSQL 9.1.4 on x86_64-unknown-linux-gnu, compiled by gcc (Ubuntu 4.4.3-4ubuntu5.1) 4.4.3, 64-bit"}
> exit
$ # remove db, leaked creds ^
$ heroku addons:remove HEROKU_POSTGRESQL_YELLOW -a my-app --confirm my-app
Removing HEROKU_POSTGRESQL_YELLOW on my-app... done, v490 (free)
與postgresql服務器的外部連接需要Heroku上的SSL。 看看文檔也是如此。
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