Resource Optimization Audit

Intermediate10 minTrending

Audit resource requests and limits across your cluster to find over-provisioned or under-provisioned workloads.

Prerequisites

-kubectl configured
-Metrics server installed

Steps

View actual resource usage vs requests

Compare real CPU and memory consumption against what was requested.

$ kubectl top pods --all-namespaces --sort-by=memory

If this fails, ensure metrics-server is installed: kubectl get deployment metrics-server -n kube-system.

Find pods without resource limits

Identify pods that do not have resource limits set, which can cause noisy neighbor problems.

$ kubectl get pods --all-namespaces -o json | jq -r '.items[] | select(.spec.containers[].resources.limits == null) | .metadata.namespace + "/" + .metadata.name'

View node resource allocation

See how much of each node's capacity is allocated to pods.

$ kubectl describe nodes | grep -A5 'Allocated resources'

List resource requests and limits for all pods

Get a summary of CPU and memory requests/limits across all pods.

$ kubectl get pods --all-namespaces -o custom-columns='NAMESPACE:.metadata.namespace,POD:.metadata.name,CPU_REQ:.spec.containers[*].resources.requests.cpu,MEM_REQ:.spec.containers[*].resources.requests.memory,CPU_LIM:.spec.containers[*].resources.limits.cpu,MEM_LIM:.spec.containers[*].resources.limits.memory'

Full Script

full-script.sh

#!/bin/bash
# Resource Optimization Audit
set -euo pipefail

echo "=== Node Resource Usage ==="
kubectl top nodes 2>/dev/null || echo "Metrics server not available"

echo ""
echo "=== Top Memory-Consuming Pods ==="
kubectl top pods --all-namespaces --sort-by=memory 2>/dev/null | head -15 || echo "Metrics server not available"

echo ""
echo "=== Pods Without Resource Limits ==="
kubectl get pods --all-namespaces -o json | jq -r '.items[] | select(.spec.containers[].resources.limits == null) | .metadata.namespace + "/" + .metadata.name' 2>/dev/null | head -20

echo ""
echo "=== Node Allocation Summary ==="
kubectl describe nodes | grep -A5 'Allocated resources'

FAQ

Discussion

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#!/bin/bash # Resource Optimization Audit set -euo pipefail echo "=== Node Resource Usage ===" kubectl top nodes 2>/dev/null || echo "Metrics server not available" echo "" echo "=== Top Memory-Consuming Pods ===" kubectl top pods --all-namespaces --sort-by=memory 2>/dev/null | head -15 || echo "Metrics server not available" echo "" echo "=== Pods Without Resource Limits ===" kubectl get pods --all-namespaces -o json | jq -r '.items[] | select(.spec.containers[].resources.limits == null) | .metadata.namespace + "/" + .metadata.name' 2>/dev/null | head -20 echo "" echo "=== Node Allocation Summary ===" kubectl describe nodes | grep -A5 'Allocated resources'