Update broke Lambda Runners

[QuinnyPig]

Just upgraded for the first time in half a year; now the Lambda runner is dying instantly with zero visibility, almost like the entrypoint is wrong. Help?

My code:

import * as cdk from 'aws-cdk-lib';
import { Size, Tags } from 'aws-cdk-lib';
import { Architecture, CodeBuildRunnerImageBuilder, CodeBuildRunnerProvider, GitHubRunners, LambdaRunnerProvider, Os } from '@cloudsnorkel/cdk-github-runners';

const app = new cdk.App();
const stack = new cdk.Stack(
  app,
  'github-runners',
  {
    env: {
      account: process.env.CDK_DEFAULT_ACCOUNT,
      region: process.env.CDK_DEFAULT_REGION,
    },
  },
);

const myBuilder = CodeBuildRunnerProvider.imageBuilder(stack, 'image builder', {
  architecture: Architecture.ARM64,
  os: Os.LINUX_UBUNTU
})

// create a custom Lambda provider
const myProvider = new LambdaRunnerProvider(stack, 'lambda runner', {
  labels: ['lambda-runner'],
  ephemeralStorageSize: Size.gibibytes(2),
  imageBuilder: myBuilder,
},

);

// create the runner infrastructure
new GitHubRunners(
  stack,
  'runners',
  {
    providers: [myProvider],
  }
);
Tags.of(app).add('project', 'lambda-runner');

app.synth();

[kichik]

The code in your post uses CodeBuildRunnerProvider.imageBuilder() instead of LambdaRunnerProvider.imageBuilder() so not all the required components are there. Specifically our wrapper that calls the runner from Lambda is not included and that will trigger Error: Runtime exited without providing a reason Runtime.ExitError as seen in the logs.

You can technically add the component yourself with the following, but it's best to use the right base image builder.

myBuilder.addComponent(RunnerImageComponent.lambdaEntrypoint());

There is also an issue where we expect you to use Os.LINUX_AMAZON_2 (or leave it out as it's the default). We always use Amazon Linux 2 base docker image right now.

Finally it looks like we're using node14 as the base image for this. That should definitely be updated.

The last two can be addressed with:

const myBuilder = LambdaRunnerProvider.imageBuilder(stack, 'image builder', {
  architecture: Architecture.ARM64,
  os: Os.LINUX_UBUNTU,
  baseDockerImage: 'a docker image that has ubuntu and lambda runtime (we use public.ecr.aws/lambda/nodejs:14-arm64 by default)',
});

[QuinnyPig]

This got it! Possibly relevant to you: node16 is now apparently EOL. Ugh...