问题：boto3客户端NoRegionError：仅在某些情况下必须指定区域错误
我有一个boto3客户程序：
boto3.client('kms')
但是它发生在新机器上，它们动态地打开和关闭。
if endpoint is None:
if region_name is None:
# Raise a more specific error message that will give
# better guidance to the user what needs to happen.
raise NoRegionError()
为什么会这样呢？为什么只有部分时间呢？
I have a boto3 client :
boto3.client('kms')
But it happens on new machines, They open and close dynamically.
if endpoint is None:
if region_name is None:
# Raise a more specific error message that will give
# better guidance to the user what needs to happen.
raise NoRegionError()
Why is this happening? and why only part of the time?
回答 0
您必须以一种或另一种方式告诉boto3您希望在哪个区域kms创建客户端。可以使用region_name参数明确地完成此操作，如下所示：
kms = boto3.client('kms', region_name='us-west-2')
或者，您可以在~/.aws/config文件中拥有一个与个人资料相关联的默认区域，如下所示：
[default]
region=us-west-2
或者您可以使用如下环境变量：
export AWS_DEFAULT_REGION=us-west-2
但您确实需要告诉boto3使用哪个区域。
One way or another you must tell boto3 in which region you wish the kms client to be created. This could be done explicitly using the region_name parameter as in:
kms = boto3.client('kms', region_name='us-west-2')
or you can have a default region associated with your profile in your ~/.aws/config file as in:
[default]
region=us-west-2
or you can use an environment variable as in:
export AWS_DEFAULT_REGION=us-west-2
but you do need to tell boto3 which region to use.
回答 1
os.environ['AWS_DEFAULT_REGION'] = 'your_region_name'
就我而言，敏感性很重要。
os.environ['AWS_DEFAULT_REGION'] = 'your_region_name'
In my case sensitivity mattered.
回答 2
我相信默认情况下，boto会选择aws cli中设置的区域。您可以运行#aws configure命令，然后按Enter键（它显示您在aws cli中使用区域设置的凭据）两次以确认您的区域。
I believe, by default, boto picks the region which is set in aws cli. You can run command #aws configure and press enter (it shows what creds you have set in aws cli with region)twice to confirm your region.
回答 3
您还可以在脚本本身中设置环境变量，而不是传递region_name参数
os.environ['AWS_DEFAULT_REGION'] = 'your_region_name'
区分大小写可能很重要。
you can also set environment variables in the script itself, rather than passing region_name parameter
os.environ['AWS_DEFAULT_REGION'] = 'your_region_name'
case sensitivity may matter.
回答 4
对于Python 2，我发现，~/.aws/config如果在默认的其他配置文件中定义了区域，则boto3库不会从中获取区域。因此，您必须在会话创建中对其进行定义。
session = boto3.Session(
profile_name='NotDefault',
region_name='ap-southeast-2'
)
print(session.available_profiles)
client = session.client(
'ec2'
)
我的~/.aws/config文件如下所示：
[default]
region=ap-southeast-2
[NotDefault]
region=ap-southeast-2
之所以这样做，是因为我将不同的配置文件用于对AWS，Personal和Work的不同登录。
For Python 2 I have found that the boto3 library does not source the region from the ~/.aws/config if the region is defined in a different profile to default.
So you have to define it in the session creation.
session = boto3.Session(
profile_name='NotDefault',
region_name='ap-southeast-2'
)
print(session.available_profiles)
client = session.client(
'ec2'
)
Where my ~/.aws/config file looks like this:
[default]
region=ap-southeast-2
[NotDefault]
region=ap-southeast-2
I do this because I use different profiles for different logins to AWS, Personal and Work.
回答 5
对于那些使用CloudFormation模板的人。您可以AWS_DEFAULT_REGION使用UserData和设置环境变量AWS::Region。例如，
MyInstance1:
Type: AWS::EC2::Instance
Properties:
ImageId: ami-04b9e92b5572fa0d1 #ubuntu
InstanceType: t2.micro
UserData:
Fn::Base64: !Sub |
#!/bin/bash -x
echo "export AWS_DEFAULT_REGION=${AWS::Region}" >> /etc/profile
For those using CloudFormation template. You can set AWS_DEFAULT_REGION environment variable using UserData and AWS::Region. For example,
MyInstance1:
Type: AWS::EC2::Instance
Properties:
ImageId: ami-04b9e92b5572fa0d1 #ubuntu
InstanceType: t2.micro
UserData:
Fn::Base64: !Sub |
#!/bin/bash -x
echo "export AWS_DEFAULT_REGION=${AWS::Region}" >> /etc/profile
