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 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

User · Answer

os environ  AWS DEFAULT REGION      your region name    In my case sensitivity mattered

User · Answer

Alternatively you can run the following  aws cli  aws configure --profile  PROFILE NAME  it ll prompt you for the region  notice in    aws config it s   default  region   ap-southeast-1 output   json   profile prod  region   ap-southeast-1 output   json   profile profile name  in the square brackets

User · Answer

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

User · Answer

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    gt  gt   etc profile

User · Answer

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

User · Answer

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

User · Answer

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

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

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