服务器性能监控脚本

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#!/bin/bash
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# 配置：监控阈值（可按需修改）
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CPU_THRESHOLD=80
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MEM_THRESHOLD=85
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DISK_THRESHOLD=85
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EMAIL="admin@example.com"
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# 获取当前服务器性能指标
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CPU_USAGE=$(top -bn1 | grep "Cpu(s)" | awk '{print $2}' | cut -d'%' -f1)
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MEM_USAGE=$(free | grep "Mem" | awk '{printf("%.2f", $3/$2 * 100.0)}')
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DISK_USAGE=$(df -h / | awk 'NR==2{print $5}' | sed 's/%//g')
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# 检查是否超过阈值并发送告警
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ALERT_MSG=""
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if (( $(echo "$CPU_USAGE > $CPU_THRESHOLD" | bc -l) )); then
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    ALERT_MSG+="[ALERT] CPU Usage: ${CPU_USAGE}% (Threshold: ${CPU_THRESHOLD}%)
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"
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fi
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if (( $(echo "$MEM_USAGE > $MEM_THRESHOLD" | bc -l) )); then
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    ALERT_MSG+="[ALERT] Memory Usage: ${MEM_USAGE}% (Threshold: ${MEM_THRESHOLD}%)
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"
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fi
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if [ $DISK_USAGE -gt $DISK_THRESHOLD ]; then
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    ALERT_MSG+="[ALERT] Disk Usage: ${DISK_USAGE}% (Threshold: ${DISK_THRESHOLD}%)
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"
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fi
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# 如果有告警信息，则发送邮件
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if [ -n "$ALERT_MSG" ]; then
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    echo -e "$ALERT_MSG" | mail -s "服务器性能告警 - $(hostname)" "$EMAIL"
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fi
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# 可选：记录当前性能指标到日志文件
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LOG_DIR="$HOME/monitoring"
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mkdir -p "$LOG_DIR"
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LOG_FILE="$LOG_DIR/performance_$(date +%Y%m%d).log"
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echo "$(date '+%Y-%m-%d %H:%M:%S') - CPU: ${CPU_USAGE}%, MEM: ${MEM_USAGE}%, DISK: ${DISK_USAGE}%" >> "$LOG_FILE"