20 November 2011 Downtime

Started by Guest_Kradorex Xeron_*, Nov 20 2011 08:06 AM

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#1 Guest_Kradorex Xeron_*

Guests

Posted 20 November 2011 - 08:06 AM

All,

At roughly 02:05 EST, A report was received that the DoujinStyle website had gone offline. Response as to investigate was immediate and no fault was detected on EidolonHost's network, investigation continued.

Between 02:12 and 02:15 a discrepancy in DNS was noted by myself and Keiro Dreamwalker, that discrepancy permitted my access to the site as I utilize ns.digibase.ca as a DNS resolver which still had the old records from prior to CloudFlare deployment. Below is a transcript of records:

ns.digibase.ca:

;; ANSWER SECTION:
doujinstyle.com.		14400   IN	  A	   173.44.33.146
;; AUTHORITY SECTION:
doujinstyle.com.		120	 IN	  NS	  ns3.eidolonhost.com.
doujinstyle.com.		120	 IN	  NS	  ns1.eidolonhost.com.
doujinstyle.com.		120	 IN	  NS	  ns4.eidolonhost.com.
doujinstyle.com.		120	 IN	  NS	  ns2.eidolonhost.com.

commonly available record (obtained using Level3/gtei public DNS resolver: 4.2.2.2)

;; ANSWER SECTION:
doujinstyle.com.		289	 IN	  A	   173.245.61.119
doujinstyle.com.		289	 IN	  A	   173.245.61.43
;; AUTHORITY SECTION:
doujinstyle.com.		43200   IN	  NS	  hugh.ns.cloudflare.com.
doujinstyle.com.		43200   IN	  NS	  gina.ns.cloudflare.com

At 02:18, I performed tests against the commonly available "A" (IP address) records, executing HTTP Requests against them as if they directly hosted the DoujinStyle.com website, below is a transcript of those activites, I chose the HTML "title" element to base success off of:

$ wget --header='Host:doujinstyle.com' http://173.245.61.43 -O - |grep "<title>"
				<title>DoujinStyle.com - Doujin Soft, Doujin Music and Touhou</title>

... Succeeded.

$ wget --header='Host:doujinstyle.com' http://173.245.61.119 -O - |grep "<title>"
--2011-11-20 02:19:51--  http://173.245.61.119/
Connecting to 173.245.61.119:80... failed: Connection timed out.

... Failed.

At 02:20 it had been determined that Cloudflare was experiencing issues on their network.

At 02:24 I investigated at Cloudflare's website: https://www.cloudflare.com/ and brought up their status page: https://www.cloudfla...m/system-status . It was determined that one or more of their nodes was encountering issues with attacks. Attacks were not directed toward DoujinStyle.com.

It was determined that CloudFlare introduces a point of failure and was further determined that its usage could compromise DoujinStyle.com's public uptime and stability as an attack against one or more sites utilizing Cloudflare can render a cloudflare node inoperative and thus take other sites offline including DoujinStyle.com.

At 02:34 Holy proceeded to switch DNS services from utilizing Cloudflare back to the ns1-4.eidolonhost.com DNS servers (of which ns2.eidolonhost.com is an alias to ns.digibase.ca), Propegation is pending.

At 3:24 I proceeded to perform testing against public DNS servers for propegation of the change:

Level3/gtei: 80% resolving correctly.
Google Public DNS: 0%
OpenDNS: 75%

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#2 Guest_Lishy_*

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Posted 20 November 2011 - 09:30 AM

Thanks for the detailed report!

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#3 KanakoVoWG

Ancient and Divine Deity

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10,456 posts

Gender:Male
Location:Scarlet Devil Mansion
Interests:Touhou; reading; playing guitar hero/Rock band; pondering random stuff; playing any video game that I like and want to play

Posted 20 November 2011 - 10:35 AM

So, basically, one of our hosts had problems, and that caused DS to shut down?

I have adopted: Holy and ShadowAurion (DS members), Reimu Hakurei (loli), Sora and Shiki Nanaya (Shotas/bishies).
I am adopted by: Mayson

The offical punching bag of DS.

SDM, about Suwako said:

[Suwako] shit the ground...

Yes she does, SDM. Yes she does.

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