#!/bin/bash

# Script to fix "too many open files" error in Kubernetes
# This error occurs when the system hits inotify limits

echo "Fixing inotify limits for Kubernetes..."

# Check current inotify limits
echo "Current inotify limits:"
sysctl fs.inotify.max_user_watches
sysctl fs.inotify.max_user_instances
sysctl fs.inotify.max_queued_events

echo ""
echo "Increasing inotify limits..."

# Increase inotify limits (temporary - lasts until reboot)
sudo sysctl -w fs.inotify.max_user_watches=524288
sudo sysctl -w fs.inotify.max_user_instances=1024
sudo sysctl -w fs.inotify.max_queued_events=16384

# Verify the changes
echo ""
echo "New inotify limits:"
sysctl fs.inotify.max_user_watches
sysctl fs.inotify.max_user_instances
sysctl fs.inotify.max_queued_events

echo ""
echo "For permanent fix, add these lines to /etc/sysctl.conf:"
echo "fs.inotify.max_user_watches=524288"
echo "fs.inotify.max_user_instances=1024"
echo "fs.inotify.max_queued_events=16384"
echo ""
echo "Then run: sudo sysctl -p"

echo ""
echo "If you're using Docker Desktop or Kind, you may need to:"
echo "1. Restart Docker Desktop"
echo "2. Or for Kind: kind delete cluster && kind create cluster"
echo "3. Or adjust the node's system limits directly"

echo ""
echo "For production environments, consider adding these limits to your deployment:"
echo "securityContext:"
echo "  runAsUser: 1000"
echo "  runAsGroup: 1000"
echo "  fsGroup: 1000"