为了测试,我试图从Docker内部运行我的python 3.4应用程序,并连接到DynamoDB Local实例。我可以从主机本地访问DynamoDB,而不会出现任何问题。从Docker容器内部与boto3连接到DynamoDB Local
但是,从Docker容器中点击时出现“连接拒绝错误”。我试过在容器中运行DynamoDB local,并将其链接到应用程序的docker容器,并在主机上运行它。一个猜测是有一些环境变量缺失,但我无法弄清楚。我无法将我的~/.aws
目录作为卷链接。
下面是一些测试代码重现错误:
import boto3
print('creating dynamodb resource')
dynamodb = boto3.resource(
'dynamodb',
endpoint_url='http://localhost:8001',
region_name='dummy_region',
aws_access_key_id='dummy_access_key',
aws_secret_access_key='dummy_secret_key',
verify=False)
print ('got resource:', dynamodb)
print('adding table')
result = dynamodb.create_table(
TableName='foo',
KeySchema=[
{
'AttributeName': 'from_email',
'KeyType': 'HASH' # Partition key
},
{
'AttributeName': 'raw_id',
'KeyType': 'RANGE' # Sort key
},
],
AttributeDefinitions=[
{
'AttributeName': 'from_email',
'AttributeType': 'S'
},
{
'AttributeName': 'raw_id',
'AttributeType': 'N'
},
],
ProvisionedThroughput={
'ReadCapacityUnits': 10,
'WriteCapacityUnits': 10
}
)
print('created table:', result)
print('getting table')
table = dynamodb.Table('foo')
print('got table:', table)
从主机运行此,这里是我的输出:
(workbench) [email protected]:~/dev/$ python dyn.py
creating dynamodb resource
got resource: dynamodb.ServiceResource()
adding table
created table: dynamodb.Table(name='foo')
getting table
got table: dynamodb.Table(name='foo')
从容器外壳内运行相同的代码:
[email protected]:/src# python dyn.py
creating dynamodb resource
got resource: dynamodb.ServiceResource()
adding table
[... traceback clipped ...]
File "/usr/local/lib/python3.4/site-packages/botocore/vendored/requests/packages/urllib3/connection.py", line 155, in connect
conn = self._new_conn()
File "/usr/local/lib/python3.4/site-packages/botocore/vendored/requests/packages/urllib3/connection.py", line 134, in _new_conn
(self.host, self.port), self.timeout, **extra_kw)
File "/usr/local/lib/python3.4/site-packages/botocore/vendored/requests/packages/urllib3/util/connection.py", line 88, in create_connection
raise err
File "/usr/local/lib/python3.4/site-packages/botocore/vendored/requests/packages/urllib3/util/connection.py", line 78, in create_connection
sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused
[ ... ]
botocore.vendored.requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))
这里是一个测试码头文件,将重现错误:
FROM python:3.4
ADD . /src
# python dependencies
RUN python3 -m pip install -U pip && \
python3 -m pip install boto3
ENTRYPOINT ["/bin/bash"]
而且我发动泊坞窗容器是这样的:
docker run --name dynamodb -p "8001:8000" -d ryan/dynamodb
docker run --link dynamodb:localhost -ti ryan/app
IIRC,当你链接两个容器时,他们不使用外部映射,所以你可能只需要使用端口8000。您应该可以使用docker在链接容器中创建的[环境变量](https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/#/environment-variables)进行检查。 –
这工作,谢谢!如果可以将此评论重新格式化为答案,我很乐意为您奖励赏金。 –
完成!请让我知道是否还有什么你认为会有助于添加... –