RDS and Aurora: Apply pending maintenance action from the CLI

Part 440 of AWS from Zero. This is lesson 19 in the RDS and Aurora track.

What we are learning

Use apply-pending-maintenance-action to work with one focused RDS and Aurora capability from the terminal. This lesson identifies the required input shape, saves the raw response, and keeps inspection separate from execution.

The AWS CLI operation is aws rds apply-pending-maintenance-action. Required operation inputs: --resource-identifier (string), --apply-action (string), --opt-in-type (string). The modeled top-level response contains ResourcePendingMaintenanceActions.

Before you run it

aws sts get-caller-identity
REGION="${AWS_REGION:-ap-south-1}"
RESOURCE_IDENTIFIER="replace-with-resource-identifier"
APPLY_ACTION="replace-with-apply-action"
OPT_IN_TYPE="replace-with-opt-in-type"
aws rds apply-pending-maintenance-action help

Use a sandbox account or an approved learning environment. Read the operation help before supplying identifiers, ARNs, network ranges, policy documents, or customer data.

Cost note: Database instances, clusters, storage, snapshots, I/O, and data transfer can incur charges.

The command

aws rds apply-pending-maintenance-action \
  --resource-identifier "$RESOURCE_IDENTIFIER" \
  --apply-action "$APPLY_ACTION" \
  --opt-in-type "$OPT_IN_TYPE" \
  --region "$REGION" \
  --output json > part-440-response.json

The response is saved to part-440-response.json so inspection is separate from execution. The explicit variables above keep required identifiers visible before the API call.

Inspect the result

node -e "const r=require('./part-440-response.json'); console.log(Object.keys(r))"
node -e "const r=require('./part-440-response.json'); console.log(JSON.stringify(r, null, 2))"

Compare the returned identifiers and status fields with the account, Region, and resource you intended to target. For asynchronous operations, continue with the service's matching get, list, or describe command until it reaches a terminal state.

One tiny variation

node -e "const r=require('./part-440-response.json'); console.log(JSON.stringify(r["ResourcePendingMaintenanceActions"], null, 2))"

This variation changes output inspection rather than adding another infrastructure concept. Keep the raw JSON while developing a query so a narrow projection does not hide an error or unexpected field.

Common mistake

Do not treat a zero exit code as proof that the intended state is active everywhere. AWS control planes can be eventually consistent, and some operations start asynchronous work.

Cleanup

# This operation is read-only, operational, or needs resource-specific rollback.
# Re-read the command output before changing shared infrastructure.
rm -f part-440-request.json part-440-response.json part-440-payload.bin part-440-debug.log

Local request and response files may contain account IDs, ARNs, names, or service configuration. Remove them when the lab is complete and follow dependency-aware cleanup for any AWS resource you created.

Next, we will learn RDS and Aurora: Describe DB cluster parameters from the CLI.

Official AWS CLI reference