#Lab 02: Server Health Monitor

1#!/bin/bash
2set -euo pipefail
3
4# Configuration
5SERVERS_FILE="servers.txt"
6ALERT_EMAIL="admin@example.com"
7
8check_port() {
9    local host=$1 port=$2
10    nc -zw3 "$host" "$port" 2>/dev/null
11}
12
13check_http() {
14    local url=$1
15    curl -sf --max-time 5 "$url" > /dev/null
16}
17
18send_alert() {
19    local message=$1
20    echo "[ALERT] $message"
21    # echo "$message" | mail -s "Server Alert" "$ALERT_EMAIL"
22}
23
24monitor() {
25    echo "=== Health Check: $(date) ==="
26    
27    while IFS=, read -r name host port; do
28        if check_port "$host" "$port"; then
29            echo "✅ $name ($host:$port)"
30        else
31            echo "❌ $name ($host:$port)"
32            send_alert "$name is down!"
33        fi
34    done < "$SERVERS_FILE"
35}
36
37# Create sample servers file
38cat > servers.txt << EOF
39Google,google.com,443
40GitHub,github.com,443
41Local,localhost,8080
42EOF
43
44monitor