Elixir / Phoenix无法连接到云托管的Postgres DB

Question

试图使我的第一个Phoenix应用程序连接到Compose的Cloud Hosted Postgres DB，但无法连接。 我已验证它已启动并正在运行。 我收到以下错误：

[error] GenServer #PID<0.178.0> terminating
** (DBConnection.ConnectionError) tcp connect (postgres://*****@aws-us-east-1-portal.5.dblayer.com:16786/compose:5432): non-existing domain - :nx
domain
    (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: nil
State: Postgrex.Protocol
** (Mix) The database for HelloPhoenix.Repo couldn't be created: an exception was raised:
    ** (DBConnection.ConnectionError) tcp connect (postgres://****@aws-us-east-1-portal.5.dblayer.com:16786/compose:5432): non-existing domain -
:nxdomain
        (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
        (connection) lib/connection.ex:622: Connection.enter_connect/5
        (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

这些是我的依赖项：

defp deps do
  [{:phoenix, "~> 1.2.1"},
  {:phoenix_pubsub, "~> 1.0"},
  {:phoenix_ecto, "~> 3.0"},
  {:postgrex, ">= 0.0.0"},
  {:phoenix_html, "~> 2.6"},
  {:phoenix_live_reload, "~> 1.0", only: :dev},
  {:gettext, "~> 0.11"},
  {:cowboy, "~> 1.0"}]
end

而我的数据库配置：

# Configure your database
config :hello_phoenix, HelloPhoenix.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "admin",
  password: "******",
  database: "compose",
  hostname: "postgres://admin:******@aws-us-east-1-portal.5.dblayer.com:16786/compose",
  pool_size: 10

并使用此版本的PostgresSQL： PostgreSQL 9.4.10

任何帮助将不胜感激。 :-)大家保重！ -克里斯

Answer 1

数据库的hostname是aws-us-east-1-portal.5.dblayer.com ，而不是整个postgres://... 另外，您还需要指定端口，因为它不是默认的PostgreSQL端口。 这应该工作：

config :hello_phoenix, HelloPhoenix.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "admin",
  password: "******",
  database: "compose",
  hostname: "aws-us-east-1-portal.5.dblayer.com",
  port: 16786,
  pool_size: 10

Answer 2

由于您似乎拥有完整的数据库URL，因此最可能的解决方案是使用该URL，然后将其解码为连接所需的组成部分。

config :hello_phoenix, HelloPhoenix.Repo,
  adapter: Ecto.Adapters.Postgres,
  url: "postgres://admin:******@aws-us-east-1-portal.5.dblayer.com:16786/compose",
  pool_size: 10

这是该功能的文档： https : //hexdocs.pm/ecto/Ecto.Repo.html#module-urls