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Compliance · Low severity

EC2 HPC Instance Without Placement Group

Instances are spread across the network, so tightly coupled jobs pay exactly the latency this hardware was bought to avoid.

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AWSprovider
Lowseverity
Compliancewhere it shows up
Manualfix, steps written out

AWS

Found, explained, handed over.

Where the estate departs from your policies, frameworks and tagging rules.

01

Detect

ZopNight checks this automatically across AWS, with read-only access to the account.

02

Explain

Every finding says exactly what to change: Put the HPC instance in a placement group.

03

Fix

The finding opens with the fix already written out, step by step, so it is one ticket, not an investigation.

Applies to
EC2 Instances on AWS
The fix, by hand
  1. Confirm the workload genuinely benefits from a Cluster placement group: tight HPC / low-latency inter-node traffic. Most general workloads do NOT.
  2. EC2 → Placement groups → Create placement group → Strategy = cluster → Name it.
  3. Stop the resource (placement groups can only be set on a stopped instance).
  4. Actions → Instance settings → Modify instance placement → select the new group → Save.
  5. Start the instance and verify inter-node bandwidth via iperf3 or your workload's own latency probe.
  6. Note: cluster placement groups require all members to be the same instance type; partition / spread groups have different trade-offs.

These are the steps the finding carries in the product.

Category
Compliance. Configuration drift from best practice: public access, missing MFA, unencrypted storage, deprecated runtimes.
Where it appears
The Compliance tab of Recommendations, with every affected resource listed.
Rule ID
RC-186
Full reference

EC2 HPC Instance Without Placement Group

Related checks

EC2 IMDSv2 Not RequiredAWSGPU Instance Low UtilisationAWSEC2 EBS Optimization Not EnabledAWSEC2 Instance Has a Public IP: Review If NeededAWSEC2 Instance Not Managed by SSMAWSEC2 RI Coverage Below 50%AWS

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