> ## Documentation Index > Fetch the complete documentation index at: https://cloudanix.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Emr instance generation remediation ### Triage and Remediation ### Remediation In AWS, the EMR control doesn’t map directly to Redshift, but the *equivalent* for Redshift is: “Redshift clusters should use current-generation node types (e.g., RA3 instead of DS2/DC1/DC2).”\ Below are step‑by‑step console instructions to migrate a Redshift cluster to latest‑generation instances. *** ### 1. Identify if your Redshift cluster is on an old generation 1. Sign in to the **AWS Management Console**. 2. Go to **Amazon Redshift** service. 3. In the left pane, click **Clusters**. 4. For each cluster: * Click the **cluster identifier** to open its details. * In the **General information** or **Properties** section, note the **Node type** (e.g., `ds2.xlarge`, `dc1.large`, `dc2.large`, etc.). 5. If the node type is not RA3 (e.g., `ra3.xlplus`, `ra3.4xlarge`, `ra3.16xlarge`), it is not latest-generation. *** ### 2. Plan the migration (choose target RA3 node type) 1. Estimate current cluster size and workload (concurrency, CPU, storage). 2. From the **Redshift pricing / documentation**, decide an RA3 node type: * Common options: `ra3.xlplus`, `ra3.4xlarge`, `ra3.16xlarge`. 3. Ensure your Region supports the RA3 node type you choose. *** ### 3. Create a snapshot (backup) of the existing cluster 1. Still in the **Clusters** page, select your existing cluster. 2. Click **Actions** → **Take snapshot**. 3. Provide a **Snapshot name**. 4. Click **Create snapshot** and wait until the status becomes **Available**. *** ### 4. Resize the existing cluster to a latest‑generation node type You have two main console options: **Elastic resize** (faster, with some constraints) or **Classic resize** (slower, more flexible). The console will show what’s available. 1. In **Clusters**, select the cluster. 2. Click **Actions** → **Resize** (or **Modify** depending on console version). 3. In the resize wizard: * Under **Node type**, choose the RA3 node type (e.g., `ra3.xlplus`). * Adjust **Number of nodes** if needed. * Choose **Elastic resize** if it’s offered and supports your change; otherwise, use **Classic resize**. 4. Review the impact: * Note possible performance impact or brief unavailability. 5. Click **Resize** / **Modify cluster** to start the operation. 6. Wait until the cluster status returns to **Available** and the new **Node type** shows the RA3 instance. *** ### 5. (Alternative) Create a new RA3 cluster and migrate If you prefer not to resize in place: 1. From **Snapshots**, select the snapshot you created. 2. Click **Actions** → **Create cluster from snapshot**. 3. Set: * A new **Cluster identifier**. * **Node type** to an RA3 type. * Adjust **Number of nodes** as needed. 4. Complete the wizard to create the new cluster. 5. Update: * Any applications, BI tools, and connection strings to point to the **new cluster endpoint**. 6. After verifying everything works, decommission the old cluster: * In **Clusters**, select the old cluster → **Actions** → **Delete**. * Optionally take a final snapshot before deletion. *** ### 6. Verify and document compliance 1. In **Clusters**, confirm: * **Node type** is RA3 for all production clusters. 2. Optionally, tag the clusters (e.g., `Key=Compliance, Value=LatestGeneration`) for tracking. 3. Update your internal runbooks / standards to mandate RA3 for new Redshift clusters. For Redshift, “latest generation” generally means RA3 node types (ra3.xlplus / ra3.4xlarge / ra3.16xlarge) instead of legacy dc2/ds2 nodes.\ You can’t in‑place change the instance family; you must resize the cluster to a newer node type. Below are step‑by‑step AWS CLI steps. *** ### 1. List your Redshift clusters and current node types ```bash theme={null} aws redshift describe-clusters \ --query "Clusters[*].{ClusterIdentifier:ClusterIdentifier, NodeType:NodeType}" \ --output table ``` Identify clusters using old node types (e.g., `ds2.xlarge`, `ds2.8xlarge`, `dc2.large`, `dc2.8xlarge`). *** ### 2. Choose an appropriate latest‑gen node type Common RA3 options: * `ra3.xlplus` – smaller/cheaper * `ra3.4xlarge` – mid‑range * `ra3.16xlarge` – largest You must pick a compatible size for your workload and region.\ (You can confirm supported node types in docs or via console; CLI has no direct “list node types” API.) *** ### 3. Check cluster details before change ```bash theme={null} aws redshift describe-clusters \ --cluster-identifier \ --output json ``` Note: * `NumberOfNodes` * `ClusterType` (e.g., `multi-node` or `single-node`) * Any special settings you’ll need to preserve. *** ### 4. Resize the cluster to RA3 (classic resize) Use `modify-cluster` with `--node-type`.\ For example, change to `ra3.xlplus`: ```bash theme={null} aws redshift modify-cluster \ --cluster-identifier \ --node-type ra3.xlplus \ --number-of-nodes \ --cluster-type multi-node \ --allow-version-upgrade \ --no-skip-final-cluster-snapshot ``` Notes: * `--number-of-nodes` is required when the node type changes on multi-node clusters. * Use `--cluster-type single-node` if your cluster is single-node. * Remove `--no-skip-final-cluster-snapshot` and instead add `--skip-final-cluster-snapshot` only if you explicitly do NOT want a final snapshot. *** ### 5. Monitor resize progress ```bash theme={null} aws redshift describe-clusters \ --cluster-identifier \ --query "Clusters[0].ClusterStatus" ``` Wait until status is `available`. *** ### 6. Verify the cluster is on latest‑gen nodes ```bash theme={null} aws redshift describe-clusters \ --cluster-identifier \ --query "Clusters[0].{ClusterIdentifier:ClusterIdentifier,NodeType:NodeType}" \ --output table ``` NodeType should now be one of the RA3 types. *** ### 7. (Optional) Automate remediation across all clusters Example shell loop: ```bash theme={null} for c in $(aws redshift describe-clusters \ --query "Clusters[?starts_with(NodeType, 'ds2.') || starts_with(NodeType, 'dc2.')].ClusterIdentifier" \ --output text); do echo "Resizing $c to ra3.xlplus..." aws redshift modify-cluster \ --cluster-identifier "$c" \ --node-type ra3.xlplus \ --number-of-nodes 2 \ --cluster-type multi-node \ --allow-version-upgrade \ --no-skip-final-cluster-snapshot done ``` Adjust node counts and types per your requirements. For Redshift this translates to: “Redshift clusters should use latest‑generation node types (RA3 instead of older DS\*/DC\*).”\ Below is how to identify non‑latest clusters and remediate them with Python (boto3). *** ## 1. Prerequisites * `boto3` installed: ```bash theme={null} pip install boto3 ``` * AWS credentials configured (via `aws configure`, env vars, or IAM role). * Decide your **target node type**, e.g. `ra3.4xlarge` or `ra3.xlplus`. * Understand Redshift resize is disruptive and can take time; plan for a maintenance window. *** ## 2. Identify Clusters Using Old Node Types ```python theme={null} import boto3 redshift = boto3.client("redshift") def list_clusters_and_node_types(): paginator = redshift.get_paginator("describe_clusters") old_clusters = [] for page in paginator.paginate(): for c in page["Clusters"]: cluster_id = c["ClusterIdentifier"] node_type = c["NodeType"] # e.g., dc2.large, ds2.xlarge, ra3.4xlarge number_of_nodes = c.get("NumberOfNodes", 1) cluster_status = c["ClusterStatus"] print(f"{cluster_id}: {node_type} ({number_of_nodes} nodes) status={cluster_status}") # Treat non-RA3 as "not latest generation" if not node_type.startswith("ra3"): old_clusters.append( { "ClusterIdentifier": cluster_id, "NodeType": node_type, "NumberOfNodes": number_of_nodes, "Status": cluster_status, } ) return old_clusters if __name__ == "__main__": old_clusters = list_clusters_and_node_types() print("\nClusters needing upgrade to latest generation (RA3):") for c in old_clusters: print(c) ``` This lets you confirm which clusters are using older generations (e.g., `dc2.large`, `ds2.xlarge`). *** ## 3. Plan the Target Node Type and Size You must choose: * A target RA3 node type, e.g.: * `ra3.xlplus` * `ra3.4xlarge` * `ra3.16xlarge` * The target number of nodes. Simple example mapping (adjust for your environment): ```python theme={null} def choose_target_for_cluster(current_node_type, current_nodes): # Simple example mapping: adjust to your sizing rules # You should base this on performance & cost analysis. if current_node_type.startswith(("dc1", "dc2", "ds2")): # Example: move anything small/medium to ra3.4xlarge target_node_type = "ra3.4xlarge" target_nodes = max(2, current_nodes) # keep or slightly increase else: # Already RA3 or unknown; don't change target_node_type = current_node_type target_nodes = current_nodes return target_node_type, target_nodes ``` *** ## 4. Perform a Classic Resize to RA3 With Python Changing node type in Redshift is done via `resize_cluster`. This is disruptive and can take a while. ```python theme={null} import time import boto3 redshift = boto3.client("redshift") def wait_for_cluster_available(cluster_id, poll_seconds=60): while True: resp = redshift.describe_clusters(ClusterIdentifier=cluster_id) status = resp["Clusters"][0]["ClusterStatus"] print(f"{cluster_id} status: {status}") if status.lower() == "available": break elif status.lower() in ("deleting", "failed"): raise RuntimeError(f"Cluster {cluster_id} ended in status {status}") time.sleep(poll_seconds) def upgrade_cluster_to_ra3( cluster_id: str, target_node_type: str, target_nodes: int, classic: bool = True, ): print(f"Upgrading {cluster_id} to {target_node_type} ({target_nodes} nodes)") if classic: # Classic resize: node type and/or node count change resp = redshift.resize_cluster( ClusterIdentifier=cluster_id, NodeType=target_node_type, NumberOfNodes=target_nodes, Classic=True, ) else: # Elastic resize mostly for node count only; not always valid for node type change resp = redshift.resize_cluster( ClusterIdentifier=cluster_id, NumberOfNodes=target_nodes, ) print("Resize started:", resp["Cluster"]["ClusterStatus"]) wait_for_cluster_available(cluster_id) print(f"{cluster_id} is now available with new configuration.") if __name__ == "__main__": # Example: upgrade all non-RA3 clusters paginator = redshift.get_paginator("describe_clusters") for page in paginator.paginate(): for c in page["Clusters"]: cid = c["ClusterIdentifier"] node_type = c["NodeType"] nodes = c.get("NumberOfNodes", 1) if node_type.startswith("ra3"): continue # already latest generation new_type, new_nodes = choose_target_for_cluster(node_type, nodes) # Optional: add safety check to require manual confirmation: print(f"Will resize {cid}: {node_type}({nodes}) -> {new_type}({new_nodes})") confirm = input("Type 'yes' to proceed: ") if confirm.lower() == "yes": upgrade_cluster_to_ra3(cid, new_type, new_nodes) ``` *** ## 5. Integrate With a Compliance/Misconfiguration Check To automatically remediate “EMR/Redshift nodes should use latest generation”: 1. Periodically run a script or Lambda that: * Lists clusters. * Flags those where `NodeType` is not RA3. * Either: * Sends alerts, or * Triggers the resize logic above (ideally gated by tags or an allow‑list). 2. Optionally, align this with AWS Config: * Use a custom AWS Config rule (Lambda) that checks Redshift node types. * If non‑RA3, mark non‑compliant and optionally trigger remediation via SSM or another Lambda using the same `resize_cluster` logic. *** If you tell me your current node types and approximate cluster sizes, I can suggest more concrete RA3 mappings. ```hcl theme={null} resource "aws_redshift_cluster" "this" { cluster_identifier = "REDSHIFT_CLUSTER_IDENTIFIER" # e.g. "analytics-prod" # Use a latest-generation node type (e.g., ra3 series instead of ds*/dc*) node_type = "LATEST_GENERATION_NODE_TYPE" # e.g. "ra3.4xlarge" master_username = "MASTER_USERNAME" master_password = "MASTER_PASSWORD" # ...any other required arguments like cluster_subnet_group_name, iam_roles, etc... } ``` Changing `node_type` forces replacement of the Redshift cluster, which is an outage-prone operation and will destroy/recreate the cluster and its data unless you design a migration strategy (snapshots, restore to new cluster, cutover, etc.). To verify, `terraform plan` should show an in-place `~` change to `node_type` accompanied by `-/+` (destroy/create) for `aws_redshift_cluster.this`, indicating the cluster will be replaced with the new, latest-generation node type.