问题
I received this error when trying to run mix ecto.create:
13:27:47.442 [error] GenServer #PID<0.3189.0> terminating ** (DBConnection.ConnectionError) tcp connect (localhost:5432):connection refused - :econnrefused (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 Hello.Repo couldn't be created: an exception was raised: ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused (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
回答1:
You must make sure that the postgresql server is running. The easiest way to this on mac OS X is through brew.
Run the command brew services start postgresql and you should see the result:
==> Successfully started postgresql (label: homebrew.mxcl.postgresql)
回答2:
do you have Postgres locally installed in your machine? This error mostly comes when you don't have Postgres installed.
Use these commands to install Postgres
sudo apt-get update sudo apt-get install postgresql postgresql-contrib
来源：https://stackoverflow.com/questions/44358515/mix-ecto-create-connection-refused