Add Script to List EKS clusters for an AWS account

aws/list-eks-clusters.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ==============================================================================
+# List All EKS Clusters Across an AWS Account (All Regions)
+#
+# What this script does
+# - Confirms the caller’s AWS Account and ARN (via STS) and asks for consent.
+# - Iterates through AWS regions and runs `aws eks list-clusters` in each.
+# - Collects results in memory and prints a clean, deduplicated summary at the end.
+# - Shows a lightweight progress indicator (dots) while scanning regions.
+#
+# Usage
+#   ./list-eks-all-regions.sh
+#
+# Optional environment variables
+#   AWS_PROFILE=<profile>          Use a named profile instead of default creds.
+#   AWS_MAX_ATTEMPTS=2             (Already set in script) Reduce CLI retries.
+#   AWS_RETRY_MODE=standard        (Already set in script) Retry behavior.
+#   REGIONS="us-east-1 us-west-2"  (If you modify the loop) Limit to specific regions.
+#
+# Prerequisites
+# - AWS CLI v2 installed and on PATH.
+# - Valid AWS credentials (env vars, default profile, or AWS SSO/session) with:
+#     sts:GetCallerIdentity
+#     ec2:DescribeRegions
+#     eks:ListClusters
+# - Network access to regional EKS endpoints.
+# ==============================================================================
+export AWS_MAX_ATTEMPTS=2
+export AWS_RETRY_MODE=standard
+
+# Get the current AWS account ID and user
+account_id=$(aws sts get-caller-identity --query "Account" --output text)
+user_arn=$(aws sts get-caller-identity --query "Arn" --output text)
+
+echo "You are about to list all EKS clusters in AWS account: $account_id"
+echo "Authenticated as: $user_arn"
+read -rp "Proceed? (y/N): " confirm
+
+if [[ "$confirm" != "y" && "$confirm" != "Y" ]]; then
+  echo "Aborted."
+  exit 1
+fi
+
+echo "Fetching EKS clusters across all regions..."
+echo "------------------------------------------------"
+
+results=()
+
+# iterate through each region, storing a string of the region and cluster
+for region in $(aws ec2 describe-regions --query "Regions[].RegionName" --output text); do
+  echo -n "."
+  clusters=$(aws eks list-clusters \
+    --region "$region" \
+    --query "clusters[]" \
+    --cli-connect-timeout 5 \
+    --cli-read-timeout 10 \
+    --output text)
+
+  if [[ -n "$clusters" ]]; then
+    for cluster in $clusters; do
+      results+=("Region: $region | Cluster: $cluster")
+    done
+  fi
+done
+echo
+echo "------------------------------------------------"
+
+# print the results 
+for line in "${results[@]}"; do
+  echo "$line"
+done
+
+echo "------------------------------------------------"
+echo "Done."