配置错误：配置中缺少区域 (AWS)

Question

I am getting a configuration error when I run my node application. The error is:

{ ConfigError: Missing region in config
at Request.VALIDATE_REGION (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:12027:47)
at Request.callListeners (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:11804:22)
at callNextListener (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:11794:14)
at C:\Users\chris\Documents\AWS API TEST\myapp\node_modules\aws-
sdk\dist\aws-sdk-react-native.js:12021:11
at finish (C:\Users\chris\Documents\AWS API TEST\myapp\node_modules\aws-
sdk\dist\aws-sdk-react-native.js:10842:9)
at Config.getCredentials (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:10887:9)
at Request.VALIDATE_CREDENTIALS (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:12016:28)
at Request.callListeners (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:11800:20)
at Request.emit (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:11776:12)
at Request.emit (C:\Users\chris\Documents\AWS API 
TEST\myapp\node_modules\aws-sdk\dist\aws-sdk-react-native.js:13792:16)
message: 'Missing region in config',
code: 'ConfigError',

The code I have is:

//Authenticate AWS:
var myCredentials = new AWS.CognitoIdentityCredentials({IdentityPoolId:'us-west-2a:"Identity Pool ID"'});
var myConfig = new AWS.Config({
          credentials: myCredentials, region: 'us-west-2a'
});

This is running on an express server using ejs and node. I am using the Amazon JavaScript SDK.

I attempted the solution here:

AWSCognito Missing region in config error

This did not help.

EDIT 1:

As requested Below, I have attacheed full code:

var express = require('express');
var AWS = require('aws-sdk');
var EC2 = require('aws-ec2')('access key', 'secret');
var scale = require('aws-scale');
var router = express.Router();

//Authenticate AWS:
var myCredentials = new AWS.CognitoIdentityCredentials({
  IdentityPoolId:'us-west-2:b0efe3c7-e4c9-420f-836b-6d776e2a9271'
}); 

var myConfig = new AWS.Config({
  credentials: myCredentials, region: 'us-west-2'
});

AWS.config = myConfig

var minInst = 1;
var maxInst = 3;

var ec2 = new AWS.EC2();
//Set up parameters for EC2 Instances:
var params = {
  ImageId: 'ami-6e1a0117',
  MaxCount: minInst,
  MinCount: maxInst, 
  InstanceInitiatedShutdownBehavior: 'terminate',
  InstanceType: 't2.micro',
  Monitoring: {
    Enabled: true 
  },
  NetworkInterfaces: [{
    AssociatePublicIpAddress: true,
    DeleteOnTermination: true,
  }],
  Placement: {
    AvailabilityZone: 'us-west-2',
  },
  SecurityGroupIds: [
    'sg-b0307ccd',
  ],
  SecurityGroups: [
    'CAB432Assignment2SG',
  ],

};
ec2.runInstances(params, function(err, data) {
  if (err){
    console.log(err, err.stack); //An error occurred
  }
  else{
    console.log(data); //Successful Response
  }
});

Answer 1

Add region in your config like this:

AWS.config.update({
    region: "REGION" //Here add you region
});

Please add it on the very top level (above the line var ec2 = new AWS.EC2(); )

Answer 2

The correct code of Oregon region is us-west-2 .You have set it as us-west-2a in two places.

While mentioning identity pool id,correct the code as below and try:

AWS.config.update({region:'us-west-2'});
var myCredentials = new AWS.CognitoIdentityCredentials({
    IdentityPoolId:'us-west-2:"Identity Pool ID"'
});

If you are not passing the region for the API CognitoIdentityCredentials , then it will pull the data from AWS.config .

Also, In your code, while initializing AWS.CONFIG with region name, You have used us-west-2a . Correct it, if you are going to use it instead of AWS.config.update .

var myConfig = new AWS.Config({
    credentials: myCredentials, region: 'us-west-2'
});

Update

I have identified another issue. The issue is that, you are initializing the AWS.config with var myConfig = new AWS.Config() but you are NOT updating the AWS.config class back with it. The missing code is : AWS.config = myConfig .

As you are not updating it back and also you are not updating the existing default class using AWS.config.update({region:'us-west-2'}); as well, it throws the Missing region in config error.

Correct Code snippet

var AWS = require('aws-sdk');
var myCredentials = new AWS.CognitoIdentityCredentials({
    IdentityPoolId:'us-west-2:identity-pool-id'
}); 
var myConfig = new AWS.Config({
    credentials: myCredentials, region: 'us-west-2'
});
AWS.config = myConfig

Answer 3

The answers above are correct. However, for aws-sdk-js-v3 you can't set AWS.config globally. Thus the workaround would be:

process.env.AWS_REGION = 'us-west-2'

Also if you're getting error about unreachable "169.254.169.254:80/latest/meta-data/iam/security-credentials/" during you CI build, you might want to set fake credentials in a same way:

process.env.AWS_REGION = 'us-west-2'
process.env.AWS_ACCESS_KEY_ID = 'test-key'
process.env.AWS_SECRET_ACCESS_KEY = 'test-secret'

Answer 4

In your case, it's the order of execution (that's why side effects are bad).

Wrong:

var myCredentials = new AWS.CognitoIdentityCredentials({
  IdentityPoolId:'us-west-2:b0efe3c7-e4c9-420f-836b-6d776e2a9271'
}); 

var myConfig = new AWS.Config({
  credentials: myCredentials, region: 'us-west-2'
});

Correct:

// update the config
var myConfig = new AWS.Config({
  credentials: myCredentials, region: 'us-west-2'
});

// then create the instance
var myCredentials = new AWS.CognitoIdentityCredentials({
  IdentityPoolId:'us-west-2:b0efe3c7-e4c9-420f-836b-6d776e2a9271'
});