AWS EFS

Mount an EFS file system to a function and a container.

This allows both your function and the container to access the same file system. Here they both update a counter that’s stored in the file system.

await writeFile("/mnt/efs/counter", newValue.toString());

The file system is mounted to /mnt/efs in both the function and the container.

// NAT Gateways are required for Lambda functions
const vpc = new sst.aws.Vpc("MyVpc", { nat: "managed" });

// Create an EFS file system to store a counter
const efs = new sst.aws.Efs("MyEfs", { vpc });

// Create a Lambda function that increments the counter
new sst.aws.Function("MyFunction", {
  handler: "lambda.handler",
  url: true,
  vpc,
  volume: {
    efs,
    path: "/mnt/efs",
  },
});

// Create a service that increments the same counter
const cluster = new sst.aws.Cluster("MyCluster", { vpc });
new sst.aws.Service("MyService", {
  cluster,
  loadBalancer: {
    ports: [{ listen: "80/http" }],
  },
  volumes: [
    {
      efs,
      path: "/mnt/efs",
    },
  ],
});

import { increment } from "./common.mjs";

export const handler = async () => {
  const counter = await increment();
  console.log("COUNTER", counter);
  return {
    statusCode: 200,
    body: JSON.stringify({
      counter,
    }),
  };
};

View the full example.