Simple AWS Lambda to verify the network connectivity when using a private VPC

doesn't require any dependencies, so you can create a lambda, configure the VPC, then upload the index.js

const https = require("https");

async function post() {
  const options = {
    hostname: "google.com",
    port: 443,
    path: "/",
    method: "GET",
  };

  const p = new Promise((resolve, reject) => {
    const req = https.request(options, (res) => {
      res.setEncoding("utf8");
      let responseBody = "";

      res.on("data", (chunk) => {
        responseBody += chunk;
      });

      res.on("end", () => {
        resolve(responseBody);
      });
    });

    req.on("error", (err) => {
      reject(err);
    });

    req.end();
  });

  try {
    const response = await p;
    console.log(response);
    return response;
  } catch (e) {
    console.error(e.message);
    throw e;
  }
}

exports.handler = async (event) => {
  await post();
};

Then you can start the lambda using the CLI or the UI. The easiest and quick way is using the UI with the test feature.

---

Get the ENI:

aws lambda list-functions --query="Functions[].{VpcConfig:{VpcId: VpcConfig.VpcId}}"

Get VPCs:

aws ec2 describe-vpcs --query="Vpcs[].{CidrBlock: CidrBlock, VpcId: VpcId}"