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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-97/">SRE Weekly Issue #97</a></h1>
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<div class="entry-date" itemprop="datePublished" >
<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-97/">November 12, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-97/" title="Permalink to SRE Weekly Issue #97" class="email_only">View on sreweekly.com</a>
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<h2 style="text-align: center; font-size: 55%; color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>Attending AWS re:Invent 2017? Visit the VictorOps booth, schedule a meeting, or join us for some after hours fun. See you in Vegas! <a href="http://try.victorops.com/SREWeekly/AWS">http://try.victorops.com/SREWeekly/AWS</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://devblog.xero.com/sre-xero-managing-incidents-part-i-7d02d650a71c" target="_blank">SRE@Xero: Managing Incidents Part I</a></div>
<div class="sreweekly-description">
<p>Last month, I linked to an article on Xero&#8217;s incident response process, and I said:</p>
<blockquote><p>I find it interesting that incident response starts off with someone filling out a form.</p></blockquote>
<p>This article goes into detail on how the form works, why they have it, and the actual questions on the form! Then they go on to explain their &#8220;on-call configuration as code&#8221; setup, which is really nifty. I can&#8217;t wait to see part II and beyond.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://githubengineering.com/stretching-spokes/" target="_blank">Stretching Spokes</a></div>
<div class="sreweekly-description">
<p>Spokes is GitHub&#8217;s system for storing distributed replicas of git repositories. This article explains how they can do this over long distances in a reasonable amount of time (and why that&#8217;s hard). I especially love the &#8220;Spokes checksum&#8221; concept.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.itproportal.com/features/fly-the-airplane-three-practices-for-effective-incident-response/" target="_blank">Fly the airplane: Three practices for effective incident response</a></div>
<div class="sreweekly-description">
<p>From the CEO of <a href="https://ns1.com">NS1</a>, a piece on the value of checklists in incident response.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/articles/the-ultimate-guide-to-secondary-dns" target="_blank">The Ultimate Guide to Secondary DNS</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s another great guide on the hows and whys of secondary DNS, including options on dealing with nonstandard record types that aren&#8217;t compatible with AXFR.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.itproportal.com/features/availability-has-a-new-meaning-and-it-doesnt-include-planned-downtime/" target="_blank">Availability has a new meaning. And it doesn&#8217;t include planned downtime.</a></div>
<div class="sreweekly-description">
<p>From a customer&#8217;s perspective, &#8220;planned downtime&#8221; and &#8220;outage&#8221; often mean the same thing.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://siliconangle.com/blog/2017/11/08/risks-serverless-future-dissolving-valuable-infrastructure-serverlessconf/" target="_blank">Risks of a &#8220;serverless&#8221; future: dissolving valuable infrastructure</a></div>
<div class="sreweekly-description">
<p>&#8220;serverless&#8221; != &#8220;NoOps&#8221;</p>
<blockquote><p>Willis urges the importance of integration with existing operations processes over replacement. “Serverless is just another form of compute. … All the core principles that we’ve really learned about high-performance organizations apply differently … but the principles stay the same,” he said.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.michaelnygard.com/blog/2017/11/root-cause-analysis-as-storytelling/" target="_blank">Root Cause Analysis as Storytelling &#8211; Wide Awake Developers</a></div>
<div class="sreweekly-description">
<p>When we use root cause analysis, says Michael Nygard, we narrow our focus into counter-factuals that get in the way of finding out what really happened.</p>
<p>CW: hypothetical violent imagery</p>
</div>
</div>
<h2>Outages</h2>
<p>This week had a weirdly large number of outages!</p>
<ul class="sreweekly-outages">
<li><a href="https://status.heroku.com/incidents/1334">Heroku</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Heroku posted a public followup for incident #1334, with a pretty interesting cause. At the end of the month, load on an internal API increased because the number of apps that ran out of monthly free quota hit a peak.
<p><small><em>Full disclosure: Heroku is my employer.</em></small></li>
</ul>
</li>
<li><a href="https://www.wired.com/story/how-a-tiny-error-shut-off-the-internet-for-parts-of-the-us/">How a Tiny Error Shut Off the Internet for Parts of the US</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">I normally don&#8217;t include ISP failures, but this one was widespread across the US and had an interesting cause. Level 3 accidentally created a <a href="https://blog.thousandeyes.com/finding-and-diagnosing-bgp-route-leaks/">route leak</a> that broke traffic for many Comcast customers (including me).</li>
</ul>
</li>
<li><a href="http://status.cloud.google.com/incident/appengine/17007#5750790484393984">Google App Engine Memcache Service</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Linked is Google&#8217;s followup analysis, which suggests that the outage was due to a scaling issue in a configuration database.</li>
</ul>
</li>
<li><a href="http://www.datacenterknowledge.com/uptime/ovh-disassemble-container-data-centers-after-epic-outage-europe">OVH to Disassemble Container Data Centers after Epic Outage in Europe</a></li>
<li><a href="https://www.dailystar.co.uk/tech/news/658998/Snapchat-DOWN-AGAIN-Notifications-not-working-as-social-network-glitches-return">Snapchat</a></li>
<li><a href="http://indianexpress.com/article/technology/social/instagram-outage-app-goes-down-for-users-globally-4930942/">Instagram</a></li>
<li><a href="http://fortune.com/2017/11/09/e-trade-is-down/">E-Trade</a></li>
<li><a href="https://heavy.com/news/2017/11/grindr-outage-down-status-dating-app/">Grindr</a></li>
<li><a href="http://www.express.co.uk/life-style/science-technology/877198/Netflix-down-not-working-connection-login">Netflix</a></li>
<li><a href="http://www.express.co.uk/life-style/science-technology/876620/Yahoo-Mail-down-not-working-login-e-mails-send-read">Yahoo Mail</a></li>
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