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Linux高手必备:5分钟掌握系统监控核心命令

  • 2026-02-08 07:06:58
Linux高手必备:5分钟掌握系统监控核心命令

Linux高手必备:5分钟掌握系统监控核心命令

真正懂Linux的人,都在用这些命令洞察系统状况

在服务器运维、开发调试或者性能分析时,你是否曾对着一台Linux机器无从下手?今天,我们直击核心,一次性掌握查看系统状态最常用的五个关键命令。

1. 内存还有多少可用?

想知道系统还剩多少内存?不用东找西找,一个命令搞定:

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free -h

-h参数表示“人类可读”,自动换算成GB、MB等单位显示。
关键看第二行(Mem)available列就是系统当前可用的内存量,这才是你真正还能用的内存。

2. CPU上跑着什么?

要看看哪些进程正在消耗CPU,使用:

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top

这是Linux系统最经典的实时监控工具。启动后,你会看到一个动态更新的界面:

  • 最上面几行显示系统整体状态(CPU、内存、负载)

  • 下面列表按CPU占用率从高到低排列进程

  • 按 q 退出,按 M 可按内存占用排序

如果想要一个简洁的进程快照,试试:

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ps aux --sort=-%cpu | head -10

这会列出CPU占用最高的10个进程。

3. CPU占用率怎么查?

上面提到的top命令已经显示了整体CPU占用率。但如果你只需要一个数字,可以用:

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mpstat 1 1 | grep -A 5 "all" | tail -1 | awk '{print 100 - $NF"%"}'

这个命令计算的是CPU空闲率的反值,即使用率。或者更简单地:

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top -bn1 | grep "Cpu(s)" | awk '{print "CPU使用率: " 100 - $8"%"}'

4. 单个文件有多大?

查看文件大小的命令是:

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ls -lh 文件名

-l显示详细信息,-h人性化显示大小。例如:

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ls -lh nginx.log

会显示类似-rw-r--r-- 1 user group 15M Apr 20 10:30 nginx.log的信息,其中的15M就是文件大小。

5. 文件夹总共多大?

查看目录总大小(包括所有子目录),用:

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du -sh 目录名

-s表示汇总总计,-h人性化显示。例如:

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du -sh /var/log

会显示类似4.2G /var/log的结果,这就是该目录的总大小。

监控实战:一个排查问题的实例

假设你收到警报:服务器响应变慢。你的排查流程可能是:

  1. 先用free -h,发现内存充足

  2. top查看,发现一个Java进程占用90% CPU

  3. ps aux | grep java找到具体进程信息

  4. du -sh /path/to/logs检查相关日志目录大小

  5. ls -lh /path/to/critical.log查看关键日志文件大小

整个过程,全是命令行操作,无需打开任何图形界面。

小贴士:组合使用更高效

Linux命令的强大之处在于可以组合使用:

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# 找出/tmp目录下最大的5个文件 du -h /tmp | sort -rh | head -5

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# 监控CPU和内存变化(每2秒刷新) watch -n 2 "free -h && echo '---' && ps aux --sort=-%cpu | head -5"

一个必须知道的命令:htop

如果你觉得top不够直观,可以试试它的增强版——htop。功能更强大,界面更友好,支持鼠标操作和颜色高亮。安装命令:

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# Ubuntu/Debian sudo apt install htop  # CentOS/RHEL sudo yum install htop

然后只需输入htop,你会看到一个直观的监控界面,进程树、CPU使用情况一目了然。

结语

掌握这些命令,你就具备了系统监控的基本能力。在日常运维、性能调优、故障排查时,这些命令就是你的“听诊器”,能让你快速了解系统的健康状况。

真正的Linux高手,不是记住所有命令的人,而是掌握核心命令,并能灵活组合解决实际问题的人。

下次当你需要查看系统状态时,不必东翻西找——打开终端,输入合适的命令,一切尽在掌握。

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  1. CONNECT:[ UseTime:0.000456s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000606s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000266s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000561s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000590s ]
  8. SELECT * FROM `article` WHERE `id` = 474274 LIMIT 1 [ RunTime:0.000374s ]
  9. UPDATE `article` SET `lasttime` = 1770531125 WHERE `id` = 474274 [ RunTime:0.006770s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 474274 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 474274 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000477s ]
  13. SELECT * FROM `article` WHERE `id` < 474274 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001181s ]
  14. SELECT * FROM `article` WHERE `id` < 474274 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000751s ]
  15. SELECT * FROM `article` WHERE `id` < 474274 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000725s ]
0.081227s