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Red Hat Enterprise Linux 10 故障排查手册(真实案例版)

  • 2026-04-20 23:26:04
Red Hat Enterprise Linux 10 故障排查手册(真实案例版)

一、SRE 故障排查方法论(先背这个🔥)

👉 标准流程:

现象 → 定位范围 → 收集数据 → 分析 → 验证 → 修复 → 复盘

👉 三板斧(必须熟):

  • ss / tcpdump
    (网络)
  • top / pidstat
    (CPU)
  • iostat
    (IO)

二、案例1:CPU 飙高(容器导致)


🎯 现象

  • CPU 100%
  • 系统响应慢
  • K8s Pod 卡顿

🔍 定位

toppidstat -u1

发现:

  • 某个容器进程 CPU 占用 300%+

👉 深入分析(RHEL10重点)

dnf install -y bpftracebpftrace -e 'profile:hz:99 { @[comm] = count(); }'

🧠 根因

  • 应用死循环(代码问题)
  • 或线程未释放

🛠️ 解决

podman stop <container>


🔒 预防

  • 限制 CPU:

podman run --cpus=1

  • 接入监控

🎤 面试表达

我通过 eBPF 定位 CPU 热点进程,比传统 top 更精准


三、案例2:磁盘 IO 100%(数据库卡死)


🎯 现象

  • MySQL 卡顿
  • 系统 load 很高

🔍 定位

iostat -x1

发现:

  • %util = 100%

iotop

发现某进程 IO 很高


🧠 根因

  • 日志写入过多
  • 或磁盘性能瓶颈

🛠️ 解决

  • 限制日志
  • 临时重启服务

🔒 预防

  • 使用 SSD / NVMe
  • 日志分盘

四、案例3:端口通但访问超时(最常见🔥)


🎯 现象

telnet80 OKcurl 超时


🔍 定位

ss -lntp

确认服务在监听


tcpdump -i eth0 port 80

发现:

  • 请求到了
  • 没有响应

🧠 根因

  • 应用线程池耗尽
  • 或后端服务挂了

🛠️ 解决

  • 重启服务
  • 扩容线程池

🔒 预防

  • 接入限流
  • 健康检查

🎤 面试亮点

网络没问题,问题在应用层


五、案例4:SSH 无法登录


🎯 现象

  • SSH 超时 / 拒绝

🔍 定位

ss -lntp | grep22


journalctl -u sshd


🧠 根因

  • sshd 挂了
  • 或防火墙问题
  • 或 SELinux 拦截

🛠️ 解决

systemctl restart sshdsetenforce 0(临时)


🔒 预防

  • 监控 sshd
  • 保留控制台入口

六、案例5:DNS 解析失败(经典)


🎯 现象

ping 域名失败ping IP 正常


🔍 定位

cat /etc/resolv.conf


dig www.baidu.com


🧠 根因

  • DNS 配置错误
  • 或 DNS 服务不可用

🛠️ 解决

echo "nameserver 8.8.8.8"  > /etc/resolv.conf

🔒 预防

  • 配置多个 DNS
  • 本地缓存 DNS

七、案例6:内存不高但系统卡死(高级🔥)


🎯 现象

  • free 内存正常
  • 系统卡

🔍 定位

vmstat 1

关注:

  • wa
    (IO等待)

🧠 根因

  • IO 等待导致假死

🛠️ 解决

  • 优化磁盘
  • 限制 IO

🎤 面试亮点

CPU 不高不代表系统健康,关键看 IO wait


八、案例7:服务频繁自动重启(systemd问题)


🎯 现象

  • 服务反复重启

🔍 定位

systemctl status nginxjournalctl -u nginx


🧠 根因

  • 配置错误
  • systemd restart策略

🛠️ 解决

Restart=on-failure


九、RHEL10 高级排障(加分项🔥)


1️⃣ eBPF 排障(核心能力)

bpftrace -e 'tracepoint:syscalls:sys_enter_execve { printf("%s\n", comm); }'

👉 用途:

  • 性能分析
  • 安全分析

2️⃣ 容器排障(重点)

podman logs <container>podman inspect <container>


3️⃣ 网络深度排查

ss -snetstat -s


十、总结(面试收尾🔥)

👉 你可以这样说:

在 RHEL10 环境下,我建立了一套标准化故障排查体系:

  • 基于 CPU / IO / 网络三维定位问题
  • 引入 eBPF 提升内核级观测能力
  • 针对常见故障形成自动化修复策略

最终将故障处理从“人工经验”升级为“体系化SRE能力”

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  1. CONNECT:[ UseTime:0.000504s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000760s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000700s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001286s ]
  6. SELECT * FROM `set` [ RunTime:0.000620s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001435s ]
  8. SELECT * FROM `article` WHERE `id` = 484432 LIMIT 1 [ RunTime:0.001185s ]
  9. UPDATE `article` SET `lasttime` = 1776725404 WHERE `id` = 484432 [ RunTime:0.010804s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000873s ]
  11. SELECT * FROM `article` WHERE `id` < 484432 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001347s ]
  12. SELECT * FROM `article` WHERE `id` > 484432 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001132s ]
  13. SELECT * FROM `article` WHERE `id` < 484432 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004418s ]
  14. SELECT * FROM `article` WHERE `id` < 484432 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001972s ]
  15. SELECT * FROM `article` WHERE `id` < 484432 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008559s ]
0.137204s