Cluster

Source: src/AWS/DAX/Cluster.ts

An Amazon DAX cluster — a fully managed, in-memory write-through cache for DynamoDB.

Clusters are VPC-only and take roughly 5-10 minutes to provision; they are billed per node-hour while they exist. Place them in a SubnetGroup and give them an IAM role that DAX assumes to reach DynamoDB. Destroy clusters you are not using.

Creating a Cluster

const role = yield* IAM.Role("DaxRole", {
  assumeRolePolicyDocument: {
    Version: "2012-10-17",
    Statement: [{
      Effect: "Allow",
      Principal: { Service: "dax.amazonaws.com" },
      Action: ["sts:AssumeRole"],
    }],
  },
  managedPolicyArns: ["arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess"],
});
const subnetGroup = yield* SubnetGroup("DaxSubnets", {
  subnetIds: [subnetA.subnetId, subnetB.subnetId],
});
const cluster = yield* Cluster("Cache", {
  nodeType: "dax.t3.small",
  replicationFactor: 1,
  iamRoleArn: role.roleArn,
  subnetGroupName: subnetGroup.subnetGroupName,
});

Encryption

const cluster = yield* Cluster("SecureCache", {
  nodeType: "dax.t3.small",
  replicationFactor: 3,
  iamRoleArn: role.roleArn,
  subnetGroupName: subnetGroup.subnetGroupName,
  sseEnabled: true,
  clusterEndpointEncryptionType: "TLS",
});