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Red Hat Enterprise Linux 10 50个真实故障案例(面试背诵版)

  • 2026-04-20 13:31:42
Red Hat Enterprise Linux 10 50个真实故障案例(面试背诵版)

一、CPU类(1~10)

1️⃣ CPU 100%

  • 现象:系统卡顿
  • 根因:死循环进程
  • 命令:top + pidstat

2️⃣ CPU 高但 load 不高

  • 根因:单核瓶颈
  • 命令:top -H

3️⃣ load 高但 CPU 低

  • 根因:IO wait
  • 命令:vmstat 1

4️⃣ CPU 被 steal

  • 根因:虚拟化资源争抢
  • 命令:top (st)

5️⃣ CPU sys 高

  • 根因:内核调用频繁
  • 命令:perf top

6️⃣ CPU 上下文切换高

  • 根因:线程过多
  • 命令:vmstat

7️⃣ CPU 飙高但找不到进程

  • 根因:内核态问题
  • 命令:perf / eBPF

8️⃣ 容器 CPU 抢占

  • 根因:未限额
  • 命令:podman stats

9️⃣ CPU 抖动

  • 根因:GC频繁
  • 命令:应用日志

🔟 CPU 正常但业务慢

  • 根因:锁竞争
  • 命令:pidstat -w

二、内存类(11~20)

11️⃣ 内存耗尽

  • 根因:内存泄漏
  • 命令:top + pmap

12️⃣ OOM Killer 触发

  • 根因:内存不足
  • 命令:dmesg

13️⃣ 内存高但未满

  • 根因:缓存占用
  • 命令:free -m

14️⃣ swap 使用高

  • 根因:内存压力
  • 命令:vmstat

15️⃣ Java 占满内存

  • 根因:堆配置不合理
  • 命令:jmap

16️⃣ 内存碎片化

  • 根因:频繁分配
  • 命令:slabtop

17️⃣ 容器内存溢出

  • 根因:未限额
  • 命令:podman inspect

18️⃣ buff/cache 高

  • 根因:正常缓存
  • 命令:free

19️⃣ 内存正常但卡

  • 根因:IO wait
  • 命令:vmstat

20️⃣ 进程 RSS 异常

  • 根因:泄漏
  • 命令:ps aux

三、磁盘 / IO(21~30)

21️⃣ IO 100%

  • 根因:磁盘瓶颈
  • 命令:iostat -x

22️⃣ 磁盘满

  • 根因:日志未清理
  • 命令:df -h

23️⃣ inode 满

  • 根因:小文件过多
  • 命令:df -i

24️⃣ IO wait 高

  • 根因:慢盘
  • 命令:vmstat

25️⃣ 写入慢

  • 根因:sync 写
  • 命令:iotop

26️⃣ 读慢

  • 根因:随机读
  • 命令:iostat

27️⃣ 磁盘抖动

  • 根因:混合 IO
  • 命令:blktrace

28️⃣ 挂载异常

  • 根因:fstab 错误
  • 命令:mount -a

29️⃣ 文件删除不释放空间

  • 根因:进程占用
  • 命令:lsof | grep deleted

30️⃣ IO 正常但慢

  • 根因:文件系统问题
  • 命令:xfs_repair

四、网络类(31~40)


31️⃣ ping 通但访问不了

  • 根因:端口问题
  • 命令:ss -lntp

32️⃣ 端口开但超时

  • 根因:应用卡死
  • 命令:tcpdump

33️⃣ 丢包严重

  • 根因:网络拥塞
  • 命令:mtr

34️⃣ DNS 失败

  • 根因:解析错误
  • 命令:dig

35️⃣ TCP 连接多

  • 根因:连接未释放
  • 命令:ss -s

36️⃣ TIME_WAIT 多

  • 根因:短连接
  • 命令:netstat

37️⃣ SYN_RECV 多

  • 根因:半连接攻击
  • 命令:ss

38️⃣ 网络慢

  • 根因:带宽不足
  • 命令:iftop

39️⃣ 内网通外网不通

  • 根因:路由/NAT
  • 命令:ip route

40️⃣ 网卡丢包

  • 根因:驱动问题
  • 命令:ethtool

五、系统 / 服务类(41~50)


41️⃣ SSH 无法登录

  • 根因:sshd挂
  • 命令:systemctl status sshd

42️⃣ 服务起不来

  • 根因:配置错误
  • 命令:journalctl

43️⃣ 服务频繁重启

  • 根因:健康检查失败
  • 命令:systemctl status

44️⃣ 定时任务不执行

  • 根因:crond未启动
  • 命令:systemctl status crond

45️⃣ 权限问题

  • 根因:chmod错误
  • 命令:ls -l

46️⃣ SELinux 拦截

  • 根因:策略限制
  • 命令:getenforce
  • 👉 SELinux

47️⃣ 服务端口冲突

  • 根因:端口占用
  • 命令:lsof -i

48️⃣ 系统时间错乱

  • 根因:NTP问题
  • 命令:chronyc sources

49️⃣ 进程僵死

  • 根因:父进程未回收
  • 命令:ps -ef

50️⃣ 系统卡死但无日志(高级🔥)

  • 根因:内核问题
  • 命令:dmesg + eBPF

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  1. CONNECT:[ UseTime:0.000406s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000785s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000320s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000579s ]
  8. SELECT * FROM `article` WHERE `id` = 484449 LIMIT 1 [ RunTime:0.001826s ]
  9. UPDATE `article` SET `lasttime` = 1776720095 WHERE `id` = 484449 [ RunTime:0.003784s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000249s ]
  11. SELECT * FROM `article` WHERE `id` < 484449 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000432s ]
  12. SELECT * FROM `article` WHERE `id` > 484449 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000389s ]
  13. SELECT * FROM `article` WHERE `id` < 484449 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006564s ]
  14. SELECT * FROM `article` WHERE `id` < 484449 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002631s ]
  15. SELECT * FROM `article` WHERE `id` < 484449 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005695s ]
0.093002s