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115 lines
3.6 KiB
Bash
Executable File
115 lines
3.6 KiB
Bash
Executable File
#!/bin/bash
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# High-density stress test - Testing CPU limit enforcement
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COUNT=50
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NAMESPACE="stress-test"
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CPU_LIMIT="300m" # 0.3 cores per sandbox = 15 total cores (testing limits!)
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MEM_LIMIT="2Gi" # 2GB per sandbox = 100GB total
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STRESS_MEM="1500M" # Stress 1.5GB memory
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# Cleanup function
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cleanup() {
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echo ""
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echo "🧹 Caught signal! Cleaning up stress test resources..."
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echo "Deleting all sandboxes in namespace '$NAMESPACE'..."
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# Use -y flag to skip confirmation
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k7 delete-all -n $NAMESPACE -y 2>/dev/null || echo "No sandboxes to delete"
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echo "Removing temporary config files..."
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rm -f k7-stress-*.yaml
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echo "Deleting namespace '$NAMESPACE'..."
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k3s kubectl delete namespace $NAMESPACE 2>/dev/null || echo "Namespace already deleted"
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echo "✅ Cleanup complete!"
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exit 0
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}
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# Set up signal handlers for cleanup
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trap cleanup SIGINT SIGTERM EXIT
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echo "=== K7 CPU Limit Enforcement Test ==="
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echo "Target: $COUNT sandboxes"
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echo "Resources per sandbox: CPU=$CPU_LIMIT (0.3 cores), Memory=$MEM_LIMIT"
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echo "Total planned usage: CPU=15 cores, Memory=100GB"
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echo "Hardware capacity: 20 cores, ~128GB RAM"
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echo ""
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echo "🎯 TESTING CPU LIMITS: Each pod will try to use 100% of 1 CPU core"
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echo " but should be limited to only 0.3 cores by Kubernetes!"
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echo ""
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# Create namespace
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echo "Creating namespace '$NAMESPACE'..."
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k3s kubectl create namespace $NAMESPACE 2>/dev/null || echo "Namespace already exists"
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echo "Creating $COUNT sandbox configurations..."
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for i in $(seq 1 $COUNT); do
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cat <<EOF > k7-stress-$i.yaml
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name: stress-pod-$i
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image: alpine:latest
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before_script: |
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# Add random delay to spread out package installs (0-30 seconds)
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sleep $((RANDOM % 30))
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echo "=== Pod $i: Installing stress-ng ==="
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apk add --no-cache stress-ng htop
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echo "=== Pod $i: Starting CPU limit enforcement test ==="
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echo "Pod $i: Attempting to use 100% of 1 CPU core (should be limited to 0.3)"
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# Try to use 1 full CPU at 100% load, but kubernetes should limit us to 300m
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stress-ng --cpu 1 --cpu-load 100 --vm 1 --vm-bytes $STRESS_MEM --timeout 900s &
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echo "=== Pod $i: CPU stress test active - testing 300m limit ==="
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limits:
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cpu: "$CPU_LIMIT"
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memory: "$MEM_LIMIT"
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ephemeral-storage: "1Gi"
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EOF
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done
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echo "Launching $COUNT sandboxes in batches of 10..."
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# Launch in batches
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for batch in $(seq 0 3); do
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start=$((batch * 10 + 1))
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end=$((batch * 10 + 10))
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echo "Launching batch $((batch + 1)): sandboxes $start-$end"
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for i in $(seq $start $end); do
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if [ $i -le $COUNT ]; then
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echo " Creating stress-pod-$i (CPU limit: $CPU_LIMIT)..."
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k7 create -f k7-stress-$i.yaml --namespace $NAMESPACE &
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fi
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done
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wait
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echo "Batch $((batch + 1)) launched, waiting 30 seconds..."
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sleep 30
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done
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echo ""
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echo "=== CPU LIMIT ENFORCEMENT TEST LAUNCHED! ==="
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echo ""
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echo "Expected behavior:"
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echo " ✅ Each sandbox should show ~0.300 CPU usage (not 1.000)"
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echo " ✅ Total cluster CPU: ~15 cores out of 20 available"
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echo " ✅ Memory usage: ~1.5GB per sandbox"
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echo ""
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echo "This proves Kubernetes CPU limits are working!"
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echo ""
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echo "Monitor the CPU enforcement:"
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echo " k7 top -n $NAMESPACE"
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echo " watch 'k3s kubectl top pods -n $NAMESPACE --sort-by=cpu'"
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echo ""
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echo "Verify limits are enforced:"
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echo " k3s kubectl describe pod -n $NAMESPACE | grep -A5 'Limits:'"
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echo ""
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echo "Clean up when done:"
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echo " k7 delete-all -n $NAMESPACE -y"
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echo " rm k7-stress-*.yaml"
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echo " k3s kubectl delete namespace $NAMESPACE"
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echo ""
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echo "Or just press Ctrl+C - automatic cleanup is enabled! 🧹"
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echo ""
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echo "🧪 SCIENCE: stress-ng tries to use 100% CPU but gets throttled to 300m!"
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