Question

我已经使用Docker和以下命令在我的计算机上设置了一个临时Postgres数据库用于测试目的：

1）

sudo docker run --name some-postgres6 -e POSTGRES_PASSWORD=mysecretpassword -p 5430:5432 postgres:9.1 -d postgres

2）

sudo docker run -it --rm --link some-postgres6:postgres postgres psql -h postgres -U postgres

我想使用Python连接到数据库：

from sqlalchemy.engine import create_engine
import psycopg2

engine = create_engine('postgresql+psycopg2://postgres:mysecretpassword@localhost/mydb?port=5432') ### IMPORTANT!!!
connection = engine.connect()

然后我收到了这个错误：

psycopg2.OperationalError: could not connect to server: Connection refused (0x0000274D/10061)
    Is the server running on host "localhost" (::1) and accepting
    TCP/IP connections on port 5432?
could not connect to server: Connection refused (0x0000274D/10061)
    Is the server running on host "localhost" (127.0.0.1) and accepting
    TCP/IP connections on port 5432?

这段代码用于在我运行Ubuntu的其他机器上工作。我猜这与windows有关。我正在运行Windows 10 Home（没有Windows经验）并使用Docker工具箱。

Answer 1

我终于弄明白了这个问题。它是＆＃34; localhost ＆＃34;，127.0.0.1上没有运行任何内容。

我不得不将其更改为docker机器的IP。如果您打开 Docker快速入门终端，则会显示此信息。它显示类似＆＃34; function Message(message) { this.message = message } Message.prototype.log = function() { if (this.color) { console.log('<' + this.color + '>', this.message) } else { console.log(this.message) } } // Padded function Padded(message) { Message.call(this, message) this.padded = true } Padded.prototype = Object.create(Message.prototype) Padded.prototype.constructor = Padded Padded.prototype.log = function() { console.log(`\n${this.message}\n`) } // Success function Success(message) { Message.call(this, message) this.color = 'green' } Success.prototype = Object.create(Message.prototype) // Here I try to assign one prototype property to another. Which does not work. Success.prototype.padded = Padded.prototype.log Success.prototype.constructor = Success // Error function Error(message) { Message.call(this, message) this.color = 'red' } Error.prototype = Object.create(Message.prototype) Error.prototype.constructor = Error const log = { success: (msg) => new Success(msg).log(), error: (msg) => new Error(msg).log() } // Here I want to be able to 'pad' a log by accessing the `padded` property on the `Success.prototype` object. //log.success.padded('test success') log.success('Test success') log.error('test error')＆＃34;

的内容

查找此IP的另一种方法是打开 资源监视器 ，转到网络标签，然后检查 TCP连接。应该docker is configured to use the default machine with IP 192.168.XX.XXX正在运行。远程地址列中显示的IP是可以工作的IP。

最后正确的命令：

docker.exe

Answer 2

不确定这只是您示例中的拼写错误，但是您将第一个代码段中的postgres容器映射到端口5430.如果这是正确的，则必须将连接字符串更改为以下内容：

engine = create_engine('postgresql+psycopg2://postgres:mysecretpassword@localhost/mydb?port=5430') ### IMPORTANT!!!

如何使用SQLAlchemy连接到Windows 10中Docker上的Postgres数据库？

2 个答案: