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IBM WAS系统从Linux迁移至Windows后应用访问异常

  • 2026-06-30 08:37:33
IBM WAS系统从Linux迁移至Windows后应用访问异常
    客户最初业务系统部署在Linux OS上,经过ADC设备运行很长一段时间没有问题。
    最初的业务架构逻辑如下:
    App-WAS-Linux-Vmware ESX;
    迁移后的业务架构逻辑如下:
App-WAS-Windows-Vmware ESX;
    业务迁移前后的IP地址配置不变,ADC负载均衡设备和网络都没有做任何调整。迁移后发现VIP可以ICMP成功,Telnet VIP对外端口正常,但是HTTP请求卡顿错误。
    排除Vmware ESX配置后,咨询WAS供应商。这个问题的核心在于Linux 和 Windows 操作系统在处理未知主机名反向解析时的行为差异,并与负载均衡的IP代理模式共同作用,最终导致了业务中断。
  • 负载均衡代理模式
    为了尽可能少的修改原有网络架构,负载均衡在部署过程中经常会采用代理模式,当 LB 收到客户端请求后,它会以自己的一个IP地址作为源IP,与后端的WAS服务器建立新的TCP连接。因此,从WAS服务器看到所有请求都来自这个PIP地址,而非真实的客户端IP。

  • WAS 应用的行为
    运行在WAS上的业务在处理请求时,会尝试对连接来源的IP地址(即PIP地址)进行反向DNS解析(Reverse DNS Lookup),以获取其主机名。这通常是应用日志记录、安全审计或业务逻辑的一部分。

  • 操作系统行为差异

    • Linux WAS: 当Linux系统上的WAS尝试解析PIP地址的主机名时,如果DNS服务器无法提供记录,Linux系统通常会快速失败或返回IP地址本身,这个过程耗时极短,对业务交互的等待时间影响可以忽略不计。
    • Windows WAS:Windows系统在DNS解析失败后,会尝试其他名称解析机制,其中最常见的是 NetBIOS over TCP/IP。NetBIOS名称解析会进行广播或查询WINS服务器,这个过程有较长的超时等待时间(通常是数秒)。WAS发起反向解析请求后,由于PIP地址没有对应的DNS记录,Windows系统陷入了这个漫长的等待中,导致业务线程被阻塞,从而出现“业务交互等待”的现象。
  • 解决方案:
    在每一台部署了WAS的Windows服务器上直接配置HOSTS文件,路径通常是:
    C:\Windows\System32\drivers\etc\hosts
    将PIP地址添加到HOST文件中,保存文件立即生效。

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  1. 请求信息 : 2026-07-04 01:28:01 HTTP/2.0 GET : https://f.mffb.com.cn/a/491248.html
  2. 运行时间 : 0.274118s [ 吞吐率:3.65req/s ] 内存消耗:4,422.15kb 文件加载:140
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000464s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000620s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006015s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011759s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000727s ]
  6. SELECT * FROM `set` [ RunTime:0.014635s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000706s ]
  8. SELECT * FROM `article` WHERE `id` = 491248 LIMIT 1 [ RunTime:0.005670s ]
  9. UPDATE `article` SET `lasttime` = 1783099681 WHERE `id` = 491248 [ RunTime:0.010159s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.005268s ]
  11. SELECT * FROM `article` WHERE `id` < 491248 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005669s ]
  12. SELECT * FROM `article` WHERE `id` > 491248 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002748s ]
  13. SELECT * FROM `article` WHERE `id` < 491248 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.048052s ]
  14. SELECT * FROM `article` WHERE `id` < 491248 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031452s ]
  15. SELECT * FROM `article` WHERE `id` < 491248 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.034163s ]
0.275723s