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Linux系统解析域名是如何进行的?

  • 2026-06-29 20:47:39
Linux系统解析域名是如何进行的?

域名解析的详细过程

1. 本地缓存检查 
    系统缓存：首先检查系统的DNS缓存，若存在有效的缓存则直接返回结果。
   线程缓存: 应用程序自身的缓存(如浏览器缓存)。
2. 本地文件解析 
  (1) /etc/hosts文件，系统默认会优先读取此文件，将域名和IP地址的静态映射加载到内存中，文件中的格式如下
192.168.1.10   www.example.com

  (2) /etc/resolv.conf文件，若本地缓存和hosts文件无匹配项，系统会根据此文件配置的DNS服务器进行查询

nameserver 114.114.114.114  

相关配置文件和作用

文件路径
作用
优先级
/etc/nsswitch.conf
配置了域名解析顺序，决定files和dns的查询顺序(如hosts优先于DNS)
最高(全局)
/etc/hosts
静态域名映射
高
/etc/resolv.conf
指定DNS服务器地址，搜索域以及解析选项
中
网络配置文件(如/etc/sysconfig/network-scripts/ifcfg-eth0)
动态设置DNS服务器(如通过DHCP或静态IP配置)
依赖系统

解析顺序的优先级

1. 本地缓存 -> /etc/hosts文件 -> /etc/resolv.conf配置的DNS服务器
2. 若/etc/nsswitch.conf配置了dns优先于files，则此时的解析顺序为: 本地缓存 → /etc/resolv.conf配置的DNS服务器 → /etc/hosts文件
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  2. 运行时间 : 0.115812s [ 吞吐率：8.63req/s ] 内存消耗：4,521.74kb 文件加载：140
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  1. CONNECT:[ UseTime:0.000629s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000885s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000508s ]
  8. SELECT * FROM `article` WHERE `id` = 493529 LIMIT 1 [ RunTime:0.007569s ]
  9. UPDATE `article` SET `lasttime` = 1783038488 WHERE `id` = 493529 [ RunTime:0.020301s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000311s ]
  11. SELECT * FROM `article` WHERE `id` < 493529 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000798s ]
  12. SELECT * FROM `article` WHERE `id` > 493529 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000519s ]
  13. SELECT * FROM `article` WHERE `id` < 493529 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000980s ]
  14. SELECT * FROM `article` WHERE `id` < 493529 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002763s ]
  15. SELECT * FROM `article` WHERE `id` < 493529 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011483s ]
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