boto3 client NoRegionError: You must specify a region error only sometimes

Question

I have a boto3 client :

boto3.client(\'kms\')

But it happens on new machines, They open and close dynamically.

    if endpoint         


        

Answer 1

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