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scripts/monitor.sh

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+#!/usr/bin/env bash
+# 每隔 N 秒采集 CPU/IO/负载/网络,带时间戳写入一个文件。
+# 用法:  bash monitor.sh [间隔秒,默认5] [输出文件,默认 monitor.log]
+# 停止:  Ctrl-C  或  kill $(cat monitor.pid)
+INTERVAL="${1:-5}"
+OUT="${2:-monitor.log}"
+echo $$ > monitor.pid
+
+echo "===== 监控开始 $(date) 间隔${INTERVAL}s 输出 $OUT =====" | tee -a "$OUT"
+command -v iostat >/dev/null 2>&1 && HAS_IOSTAT=1 || HAS_IOSTAT=0
+command -v sar   >/dev/null 2>&1 && HAS_SAR=1   || HAS_SAR=0
+[ "$HAS_IOSTAT" = 0 ] && echo "(无 iostat, 只记 vmstat; 装: yum/apt install sysstat)" | tee -a "$OUT"
+
+trap 'echo "===== 监控停止 $(date) =====" >> "$OUT"; rm -f monitor.pid; exit 0' INT TERM
+
+while true; do
+  {
+    echo "----- $(date '+%Y-%m-%d %H:%M:%S') -----"
+    echo "[vmstat] r=运行队列 b=阻塞(等IO) wa=iowait% id=空闲%"
+    vmstat 1 2 | tail -1
+    if [ "$HAS_IOSTAT" = 1 ]; then
+      echo "[iostat] %util>90=磁盘吃满  w/s=写次数  w_await=写延迟ms"
+      # 取第二份报告(间隔值, 非开机累计), 只留设备行
+      iostat -dx 1 2 | awk '/Device/{c++} c==2'
+    fi
+    if [ "$HAS_SAR" = 1 ]; then
+      echo "[net] 网卡收发 kB/s:"
+      sar -n DEV 1 1 | awk '/Average:/ && $2!="lo" && $2!="IFACE" {printf "   %s rx=%s tx=%s kB/s\n",$2,$5,$6}'
+    fi
+    echo ""
+  } >> "$OUT" 2>&1
+  sleep "$INTERVAL"
+done