AWS Redis serverless

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In this example, we create an ElastiCache Serverless Redis and connect to it from a function in the same VPC. The maximum storage and ECPUs per second cap how far the cache scales.

A serverless cache always uses TLS and has a generated password, like a provisioned Redis.

index.ts

const client = new Cluster(
  [{ host: Resource.MyRedis.host, port: Resource.MyRedis.port }],
  {
    redisOptions: {
      tls: { checkServerIdentity: () => undefined },
      username: Resource.MyRedis.username,
      password: Resource.MyRedis.password,
    },
  }
);

sst.config.ts

// The function only talks to Redis inside the VPC, so it needs no NAT gateway.
// SST warns about it anyway, as the function can't reach the internet.
const vpc = new sst.aws.Vpc("MyVpc");
const redis = new sst.aws.Redis("MyRedis", {
  vpc,
  serverless: {
    storage: { maximum: "10 GB" },
    ecpuPerSecond: { maximum: 5000 },
  },
});
new sst.aws.Function("MyApp", {
  handler: "index.handler",
  url: true,
  vpc,
  link: [redis],
});

View the full example.