Firefox 使 dns 缓存失效 [英] Firefox invalidate dns cache

问题描述

我访问我在客户服务器上设置的站点的速度太快了，Firefox 现在记住了(示例)的默认站点

I was too quick about visiting a site I set up on a customer server, and Firefox now remembers, that the default site for (example)

testsite.mycompanyname.com (non existing subdomain, same as *.mycompanyname.com)

是

www.mycompanyname.dk - or rather the IP of the default server

我后来设置了公共 DNS(a-record)以重定向到另一台服务器，但 Firefox 会记住默认 IP 地址.

I have then later set up the public DNS (a-record) to redirect to another server, but Firefox remembers the default IP adress.

Chrome/IE/Safari - 没问题，因为他们在 DNS 启动之前没有访问过那个网站......

Chrome/IE/Safari - no problem, as they have not visited that site before DNS kicked in...

我在 about:config 中设置了这些:

I have set these in about:config:

network.dns.disablePrefetch = true
network.dnsCacheExpiration = 0

还有什么吗?

我真的需要 firebug 来调试那个站点的前端......

I really need firebug to debug the frontend on that site....

干杯

推荐答案

DNS 缓存发生在多个级别:应用程序询问本地系统，它要求本地配置的解析 DNS 服务器，询问权威 DNS 服务器.

DNS caching occurs at multiple levels: Application asks local system, which asks locally configured resolving DNS server, which asks authoritative DNS servers.

• 我发现 Firefox 可以退出并重新启动.about:config中的相关设置为network.dnsCacheEntries和network.dnsCacheExpiration，可以设置为0以禁用缓存.

• I've found for Firefox that quitting and restarting works. The relevant settings in about:config are network.dnsCacheEntries and network.dnsCacheExpiration, which can be set to 0 in order to disable caching.

• 诊断:ping 和其他应用程序一样，使用本地系统 DNS 缓存
• 刷新 MacOsX 10.8:sudo killall -HUP mDNSResponder (参考)
  (其他版本可能有所不同)
• 刷新 Windows:ipconfig/flushdns(仅当启用了 DNS 缓存服务 HKLMSYSTEMCurrentControlSetServicesDnscache 时；检查 netstart|findstr/i dns 或 compmgmt.msc)
• Linux/Unix 可以使用 nscd(名称服务缓存守护进程)或 dnsmasq，或两者都使用 ...

• Diagnostic: ping, like other applications, uses local system DNS cache
• Flush MacOsX 10.8: sudo killall -HUP mDNSResponder (reference)
  (May vary for other versions)
• Flush Windows: ipconfig /flushdns (only if the DNS caching service, HKLMSYSTEMCurrentControlSetServicesDnscache, is enabled; check with net start|findstr /i dns or compmgmt.msc)
• Linux/Unix may use nscd (name services caching daemon), or dnsmasq, or both ...

• 诊断:nslookup首先报告解析服务器的地址，然后是请求的地址.
• 刷新绑定:rndc flush or rndc flushname DOMAIN.NAME

• Diagnostic: nslookup first reports address of resolving server, then address requested.
• Flush BIND: rndc flush or rndc flushname DOMAIN.NAME

TTL 代表生存时间"这一术语，用于描述请求客户端或服务器认为 DNS 记录有效的时间.较短的 TTL 意味着请求者被告知不要将 DNS 查找缓存太久.TTL 的范围可以从几秒(例如 DynDNS 和类似的)到几天或几周.

TTL stands for "time to live" a term used to describe how long a DNS record is to be deemed valid by the requesting client or server. A short TTL means that the requester is told not to cache a DNS lookup for too long. The TTL can range from mere seconds (e.g. for DynDNS and similar) to days or weeks.

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