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devops/orchestration/kubernetes-ops/scripts/cluster-health-check.sh

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+#!/bin/bash
+# Kubernetes Cluster Health Check Script
+# Usage: ./cluster-health-check.sh [namespace]
+
+set -euo pipefail
+
+NAMESPACE="${1:-default}"
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+echo "========================================="
+echo "Kubernetes Cluster Health Check"
+echo "========================================="
+echo ""
+
+# Check cluster connectivity
+echo -n "Checking cluster connectivity... "
+if kubectl cluster-info &>/dev/null; then
+    echo -e "${GREEN}OK${NC}"
+else
+    echo -e "${RED}FAILED${NC}"
+    exit 1
+fi
+
+# Node status
+echo ""
+echo "Node Status:"
+echo "------------"
+kubectl get nodes -o wide
+
+# Check for NotReady nodes
+NOT_READY=$(kubectl get nodes --no-headers | grep -v " Ready" | wc -l)
+if [ "$NOT_READY" -gt 0 ]; then
+    echo -e "${RED}WARNING: $NOT_READY node(s) not ready${NC}"
+fi
+
+# Pod status in namespace
+echo ""
+echo "Pod Status in namespace '$NAMESPACE':"
+echo "--------------------------------------"
+kubectl get pods -n "$NAMESPACE" -o wide
+
+# Check for failed pods
+FAILED_PODS=$(kubectl get pods -n "$NAMESPACE" --no-headers | grep -E "Error|CrashLoopBackOff|ImagePullBackOff" | wc -l)
+if [ "$FAILED_PODS" -gt 0 ]; then
+    echo -e "${RED}WARNING: $FAILED_PODS pod(s) in error state${NC}"
+fi
+
+# Resource usage
+echo ""
+echo "Resource Usage:"
+echo "---------------"
+kubectl top nodes 2>/dev/null || echo "Metrics server not available"
+
+# Recent events
+echo ""
+echo "Recent Warning Events:"
+echo "----------------------"
+kubectl get events -n "$NAMESPACE" --field-selector type=Warning --sort-by='.lastTimestamp' | tail -10
+
+# PVC status
+echo ""
+echo "PersistentVolumeClaim Status:"
+echo "-----------------------------"
+kubectl get pvc -n "$NAMESPACE" 2>/dev/null || echo "No PVCs found"
+
+# Service status
+echo ""
+echo "Services:"
+echo "---------"
+kubectl get svc -n "$NAMESPACE"
+
+echo ""
+echo "========================================="
+echo "Health check complete"
+echo "========================================="