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在dns query這個產品中，有4篇Facebook貼文，粉絲數超過2,850的網紅矽谷牛的耕田筆記，也在其Facebook貼文中提到， 關鍵字: conntrack, DNS, CoreDNS-autoscaler 影響: 部分正式生產環境崩壞 整個問題是簡單來說就是正式叢集再不預期的情況下，發生了 DNS 的問題，導致內部服務大概有 15000 筆 query 失敗。造成錯誤的原因是因為 kube-proxy 沒有順利地去移除過...

dns query 在 矽谷牛的耕田筆記 Facebook 的最佳解答

矽谷牛的耕田筆記 By 矽谷牛的耕田筆記

2021-03-08 09:01:43 有 43 人按讚
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關鍵字: conntrack, DNS, CoreDNS-autoscaler
影響: 部分正式生產環境崩壞

整個問題是簡單來說就是正式叢集再不預期的情況下，發生了 DNS 的問題，導致內部服務大概有 15000 筆 query 失敗。造成錯誤的原因是因為 kube-proxy 沒有順利地去移除過期的 conntrack，導致有些 DNS封包被導向到一個已經不存在的Pod。

這個問題的發生前提是，因為某些情境的發生，譬如系統負載過低， CoreDNS-autoscaler 就被觸發起來，將運行的 Pod 數量從三個降為兩個。所以系統上能夠處理 DNS 的Pod剩下兩個，但是如果有節點上的 conntrack 沒有順利清理乾淨，導致所有的封包都被導向那個被刪除的 CoreDNS，問題就這樣發生了。

詳細的過程跟一些學習重點可以參考原文

註:想要掌握 kubernetes 網路，對於 conntrack 的認識絕對不可以少，有太多太多的問題都跟 conntrack 有關，從 race condition, max 等眾多選項都牽扯所有運行的封包。有時間的話一定要好好的複習一下 conntrack 的概念

https://medium.com/preply-engineering/dns-postmortem-e169efd45afd

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矽谷牛的耕田筆記

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目前工作內容主要以 DevOps 為主，本身是微軟 Cloud and Datacenter Management MVP，閒暇之餘會透過文章記錄所學，記錄於 https://www.hwchiu.com. 喜歡參加社群活動來學習不同的經驗，藉此增廣見聞 目前主要參加的社群是 CNTUG，偶而會參加線上 Meetup ，透過網路的方式分享一些心得，並且錄影分享於 Youtube 上
工作與閒暇之餘的學習筆記，紀錄各式各樣的科技文章，同時分享自身部落格文章，線上社群演講以及線上課程資訊
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dns query 在 iThome Facebook 的最讚貼文

iThome By iThome

2020-10-11 12:00:41 有 62 人按讚
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IBM Security團隊利用免費DNS平臺Quad9的網域查詢流量曲線（Query traffic curve）資料，來進行分群，並從中找出未知的惡意網域群。
https://www.ithome.com.tw/news/139356

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iThome Online 是臺灣第一個網路原生報，提供IT產業即時新聞、企業IT產品報導與測試、技術專題、IT應用報導、IT書訊，以及面向豐富的名家專欄。
IT職場必備第一手的IT產品情報、企業科技趨勢、IT技術動向、資訊管理心法，通通都在iThome
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dns query 在 iThome Facebook 的最佳貼文

iThome By iThome

2020-08-14 10:40:52 有 58 人按讚
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IBM Security團隊利用免費DNS平臺Quad9的網域查詢流量曲線（Query traffic curve）資料，來進行分群，並從中找出未知的惡意網域。

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iThome

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iThome Online 是臺灣第一個網路原生報，提供IT產業即時新聞、企業IT產品報導與測試、技術專題、IT應用報導、IT書訊，以及面向豐富的名家專欄。
IT職場必備第一手的IT產品情報、企業科技趨勢、IT技術動向、資訊管理心法，通通都在iThome
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#87. Securing Network Infrastructure for DNS Servers | RIPE Labs

When a client sends a DNS query to your DNS server, normally the packet length is between 50 and 550 bytes (including the IP header) , so we ...

#88. What is Forward DNS lookup? - Definition from WhatIs.com

Reverse DNS lookup is using an Internet IP address to find a domain name. When you enter the address for a Web site at your browser (the address is formally ...

#89. DNS for Services and Pods | Kubernetes

Introduction Kubernetes DNS schedules a DNS Pod and Service on the ... A DNS query may return different results based on the namespace of ...

#90. 關於DNS的遞迴查詢攻擊與防護 - Google Docs

最近有許多學校的DNS遭到了攻擊，全都是因為沒有限制遞迴查詢，導致外面的IP也可以使用學校的DNS進行遞迴查詢，產生大量的查詢封包，攻擊者只要利用沒有限制遞迴查詢的 ...

#91. DoS.Win.DNS.Query.exploit - Kaspersky Threats

DNS.Query.exploit. Home Threats DoS DoS.Win.DNS.Query.exploit ... svchost.exe) by using a corrupted DNS request that triggers the NULL pointer dereference.

#92. How to Use Linux dig Command (DNS Lookup) {With Examples}

This comprehensive guide on the Linux dig command (with examples) covers all you need to know to lookup DNS information. Get stated now!

#93. Three things you may not know that DNS data can tell you

DNS queries are generated every time someone visits a website or sends an email, translating the domain name into an IP address to find the ...

#94. The ISPs sharing your DNS query data - Benjojo's Blog

A lot of “threat intelligence” relies on DNS data for research, so security teams inside of companies often log DNS queries so they can track ...

#95. DNS Query Support — dnspython 2.2.0 documentation

The dns.query module is for sending messages to DNS servers, and processing their responses. If you want “stub resolver” behavior, then you should use the ...

#96. Domain Name System, DNS Query , DNS Response

DNS server response the query to client machine and translate it IP address of domain-name. In technically computer use IP address (Ipv4 and Ipv6) in order to ...