cdk.context.json is not created.

[DariocfTrendzact]

Hi everyone,

I have some troubles trying to run an existing project.

The code is trying to create an VPC endpoint, but I receive the following error:

RuntimeError: Can't add a gateway endpoint to VPC; route table IDs are not available

Before this creation, there is a ec2.Vpc.from_lookup call to get the VPC information. As I understand, there must be a cdk.context.json with the VPC information, but is not creating the file. I think I have setted all the environment variables to run the code:

• CDK_DEPLOY_REGION=us-east-2
• CDK_DEPLOY_ACCOUNT=XXXXXXXXXX
• CDK_DEFAULT_ACCOUNT=XXXXXXXXXX
• CDK_DEFAULT_REGION=us-east-2
• AWS_ACCESS_KEY_ID=XXXXXXXXXXXX
• AWS_SECRET_ACCESS_KEY=XXXXXXXXXX
• AWS_DEFAULT_REGION=us-east-2

the code is searching with the correct information:

VPC = ec2.Vpc.from_lookup(
            self,
            "vpclookup",
            vpc_name="VPC001"
 )

...

ec2.GatewayVpcEndpoint(
            self,
            "endpoint001",
            vpc=VPC ...

when I try to run the cdk list I'm getting the following output:

$ cdk list -v
[13:24:00] CDK toolkit version: 2.87.0 (build 9fca790)
[13:24:00] Command line arguments: {
  _: [ 'list' ],
  v: 1,
  verbose: 1,
  deployRegion: 'us-east-2',
  deployAccount: 'XXXXXXXXXXXX',
  defaultAccount: 'XXXXXXXXXXXX',
  defaultRegion: 'us-east-2',
  lookups: true,
  'ignore-errors': false,
  ignoreErrors: false,
  json: false,
  j: false,
  debug: false,
  ec2creds: undefined,
  i: undefined,
  'version-reporting': undefined,
  versionReporting: undefined,
  'path-metadata': undefined,
  pathMetadata: undefined,
  'asset-metadata': undefined,
  assetMetadata: undefined,
  'role-arn': undefined,
  r: undefined,
  roleArn: undefined,
  staging: true,
  'no-color': false,
  noColor: false,
  ci: false,
  long: false,
  l: false,
  '$0': 'cdk'
}
[13:24:00] cdk.json: {
  "app": "python3 app.py",
  "watch": {
    "include": [
      "**"
    ],
    "exclude": [
      "README.md",
      "cdk*.json",
      "requirements*.txt",
      "source.bat",
      "**/__init__.py",
      "python/__pycache__",
      "tests"
    ]
  },
  "context": {
    "@aws-cdk/aws-apigateway:usagePlanKeyOrderInsensitiveId": true,
    "@aws-cdk/core:stackRelativeExports": true,
    "@aws-cdk/aws-rds:lowercaseDbIdentifier": true,
    "@aws-cdk/aws-lambda:recognizeVersionProps": true,
    "@aws-cdk/aws-cloudfront:defaultSecurityPolicyTLSv1.2_2021": true,
    "@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver": true,
    "@aws-cdk/aws-ec2:uniqueImdsv2TemplateName": true,
    "@aws-cdk/core:checkSecretUsage": true,
    "@aws-cdk/aws-iam:minimizePolicies": true,
    "@aws-cdk/core:target-partitions": [
      "aws",
      "aws-cn"
    ]
  }
}
[13:24:00] merged settings: {
  versionReporting: true,
  assetMetadata: true,
  pathMetadata: true,
  output: 'cdk.out',
  app: 'python3 app.py',
  watch: {
    include: [ '**' ],
    exclude: [
      'README.md',
      'cdk*.json',
      'requirements*.txt',
      'source.bat',
      '**/__init__.py',
      'python/__pycache__',
      'tests'
    ]
  },
  context: {
    '@aws-cdk/aws-apigateway:usagePlanKeyOrderInsensitiveId': true,
    '@aws-cdk/core:stackRelativeExports': true,
    '@aws-cdk/aws-rds:lowercaseDbIdentifier': true,
    '@aws-cdk/aws-lambda:recognizeVersionProps': true,
    '@aws-cdk/aws-cloudfront:defaultSecurityPolicyTLSv1.2_2021': true,
    '@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver': true,
    '@aws-cdk/aws-ec2:uniqueImdsv2TemplateName': true,
    '@aws-cdk/core:checkSecretUsage': true,
    '@aws-cdk/aws-iam:minimizePolicies': true,
    '@aws-cdk/core:target-partitions': [ 'aws', 'aws-cn' ]
  },
  debug: false,
  toolkitBucket: {},
  staging: true,
  bundlingStacks: [],
  lookups: true
}
[13:24:00] Determining if we're on an EC2 instance.
[13:24:00] Does not look like an EC2 instance.
[13:24:00] Toolkit stack: CDKToolkit
[13:24:00] Setting "CDK_DEFAULT_REGION" environment variable to us-east-2
[13:24:00] Resolving default credentials
[13:24:00] Reading cached notices from /Users/user/.cdk/cache/notices.json
[13:24:00] Retrieved account ID XXXXXXXXXXXX from disk cache
[13:24:00] Setting "CDK_DEFAULT_ACCOUNT" environment variable to XXXXXXXXXXXX
[13:24:00] context: {
  '@aws-cdk/aws-apigateway:usagePlanKeyOrderInsensitiveId': true,
  '@aws-cdk/core:stackRelativeExports': true,
  '@aws-cdk/aws-rds:lowercaseDbIdentifier': true,
  '@aws-cdk/aws-lambda:recognizeVersionProps': true,
  '@aws-cdk/aws-cloudfront:defaultSecurityPolicyTLSv1.2_2021': true,
  '@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver': true,
  '@aws-cdk/aws-ec2:uniqueImdsv2TemplateName': true,
  '@aws-cdk/core:checkSecretUsage': true,
  '@aws-cdk/aws-iam:minimizePolicies': true,
  '@aws-cdk/core:target-partitions': [ 'aws', 'aws-cn' ],
  'aws:cdk:enable-path-metadata': true,
  'aws:cdk:enable-asset-metadata': true,
  'aws:cdk:version-reporting': true,
  'aws:cdk:bundling-stacks': []
}
[13:24:00] outdir: cdk.out
[13:24:00] env: {
  CDK_DEFAULT_REGION: 'us-east-2',
  CDK_DEFAULT_ACCOUNT: 'XXXXXXXXXXXX',
  CDK_OUTDIR: 'cdk.out',
  CDK_CLI_ASM_VERSION: '32.0.0',
  CDK_CLI_VERSION: '2.87.0'
}
[WARNING] aws-cdk-lib.CfnResource#addDependsOn is deprecated.
  use addDependency
  This API will be removed in the next major release.
jsii.errors.JavaScriptError:
  Error: Can't add a gateway endpoint to VPC; route table IDs are not available
      at new GatewayVpcEndpoint (/private/var/folders/r0/ml04w_v94y9327259yr3_bpr0000gp/T/jsii-kernel-tKP3N6/node_modules/aws-cdk-lib/aws-ec2/lib/vpc-endpoint.js:112:19)
      at Kernel._create (/private/var/folders/r0/ml04w_v94y9327259yr3_bpr0000gp/T/tmp4co7vn0j/lib/program.js:9964:29)
      at Kernel.create (/private/var/folders/r0/ml04w_v94y9327259yr3_bpr0000gp/T/tmp4co7vn0j/lib/program.js:9693:29)
      at KernelHost.processRequest (/private/var/folders/r0/ml04w_v94y9327259yr3_bpr0000gp/T/tmp4co7vn0j/lib/program.js:11544:36)
      at KernelHost.run (/private/var/folders/r0/ml04w_v94y9327259yr3_bpr0000gp/T/tmp4co7vn0j/lib/program.js:11504:22)
      at Immediate._onImmediate (/private/var/folders/r0/ml04w_v94y9327259yr3_bpr0000gp/T/tmp4co7vn0j/lib/program.js:11505:46)
      at process.processImmediate (node:internal/timers:471:21)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/app.py", line 98, in <module>
    vpc_endpoints_stack = VPCEndpointsStack(
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/.venv/lib/python3.10/site-packages/jsii/_runtime.py", line 112, in __call__
    inst = super().__call__(*args, **kwargs)
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/network_content_delivery/vpc/vpc_endpoints/vpc_endpoints.py", line 82, in __init__
    ec2.GatewayVpcEndpoint(
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/.venv/lib/python3.10/site-packages/jsii/_runtime.py", line 112, in __call__
    inst = super().__call__(*args, **kwargs)
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/.venv/lib/python3.10/site-packages/aws_cdk/aws_ec2/__init__.py", line 83770, in __init__
    jsii.create(self.__class__, self, [scope, id, props])
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/.venv/lib/python3.10/site-packages/jsii/_kernel/__init__.py", line 334, in create
    response = self.provider.create(
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/.venv/lib/python3.10/site-packages/jsii/_kernel/providers/process.py", line 363, in create
    return self._process.send(request, CreateResponse)
  File "/Users/user/Documents/Trendzact/cdk/dev/infra/.venv/lib/python3.10/site-packages/jsii/_kernel/providers/process.py", line 340, in send
    raise RuntimeError(resp.error) from JavaScriptError(resp.stack)
RuntimeError: Can't add a gateway endpoint to VPC; route table IDs are not available
[13:24:08] Reading cached notices from /Users/user/.cdk/cache/notices.json

The VPC exists in the region and the name is correct, I have permissions as administrator in the account.

Is there something that I forgot to set? Any env variable?

[peterwoodworth]

Couple things to check/try:

• Did you specify the environment in your stack?
• Try running cdk synth -v instead, I'm not familiar with exactly what cdk list does under the hood off the top of my head
• Try commenting out all parts of your stack except the lookup, and running cdk synth -v. Does the file get generated then? If so, you're probably running into the same bug as described here

[DariocfTrendzact]

Thank you @peterwoodworth

Commenting the code resolved my problem, I really appreciate your help.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.

[sarma-nci-nih-essex]

In my case, the cdk-synth STOPPED updating cdk.context.json. No idea when it did, as this project is over 2 yrs old.

To the point noted by @peterwoodworth ..
using -v (a.k.a. verbose cli-flag) should give you a clue as to what's going on.

In my case, I could clearly see the following:

[10:42:48] Looking up AWS region in the EC2 Instance Metadata Service (IMDS).
[10:42:49] Unable to retrieve AWS region from IMDS: Error: Error fetching metadata token: TimeoutError: Socket timed out without establishing a connection within 1000 ms
[10:42:49] Unable to determine AWS region from environment or AWS configuration (profile: "EssexCloud-DEV"), defaulting to 'us-east-1'
[10:42:50] Toolkit stack: CDKToolkit
[10:42:50] Setting "CDK_DEFAULT_REGION" environment variable to us-east-1
[10:42:50] Retrieved account ID 123456789012 from disk cache
[10:42:50] Setting "CDK_DEFAULT_ACCOUNT" environment variable to 123456789012

FYI: My env parameter passed into aws_cdk.Stack construct is:-

env = Environment(
        account=os.environ["CDK_DEFAULT_ACCOUNT"],
        region=os.environ["CDK_DEFAULT_REGION"],
)

$ npx cdk --version
2.1005.0 (build be378de)

I printed out env for debugging purposes, and it is just fine.
FYI: I also pass in --profile and --region CLI-args to the npx cdk command.

Update

Running the following command .. got rid of that (above noted) error message.

aws configure --profile ${AWSPROFILE} --region ${AWSREGION}

But, STILL --NO-- ❌ cdk.context.json !!

[sarma-nci-nih-essex]

We were unexpectedly passing the value for the "scope" parameter to the stack (doing vpc.fromLookup()) ..
.. as 'None' (python) a.k.a. undefined (JS/TS).
That was the problem.
Fixed. cdk.context.json is now being generated.