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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-73/">SRE Weekly Issue #73</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-73/">May 21, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-73/" title="Permalink to SRE Weekly Issue #73" class="email_only">View on sreweekly.com</a>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://engineering.grab.com/troubleshooting-unusual-aws-elb-5xx-error" target="_blank">Troubleshooting Unusual AWS ELB 5XX Error</a></div>
<div class="sreweekly-description">
<p>ELBs (Amazon&#8217;s Elastic Load Balancers) depend on clients properly respecting DNS round-robin record sets. This article follows a debugging session in excellent detail as they try to answer the question: why are our clients preferring (and overloading) just one ELB IP?</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://duringthedrive.com/2017/05/15/serverless-a-replacement-for-servers/" target="_blank">Serverless: A replacement for servers?</a></div>
<div class="sreweekly-description">
<p>Sarah Schieffer Riehl shares her take on ServerlessConf Austin 2017. She&#8217;s got a healthy dose of skepticism that I like, concluding that &#8220;serverful and serverless architectures don’t do the same things.&#8221; I like this bit:</p>
<blockquote><p>For processes that require polling or any kind of server wakefulness, converting to a serverless architecture can be an exercise in “serverless for serverless’ sake&#8221;.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/production-ready/premortems-the-art-of-negative-visualization-583081559ea1" target="_blank">Premortems: The Art of Negative Visualization</a></div>
<div class="sreweekly-description">
<p>Wow, this dovetails so well into the <a href="http://preaccidentpodcast.podbean.com/e/safety-moment-are-accidents-a-failure-of-imagination/">Todd Conklin&#8217;s &#8220;Safety Moment&#8221;</a> from last week, on imagining all the possible things that could go wrong.  I&#8217;d love to hear more thoughts along these lines: is it <i>possible</i> to design a reliable system without envisioning the majority of things that could go wrong?</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/incident-lifecycle-management/" target="_blank">Keep Critical Apps and Infrastructure Up and Running</a></div>
<div class="sreweekly-description">
<p>PagerDuty outlines an incident lifecycle management policy based on ITIL.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blogs.dropbox.com/tech/2017/05/introducing-cape/" target="_blank">Introducing Cape</a></div>
<div class="sreweekly-description">
<p>DropBox created Cape for &#8220;asynchronous processing of billions of events a day, powering many Dropbox features&#8221;. Example: you upload a text file, and a Cape job indexes it immediately for full-text searching. I&#8217;d love to hear more on why existing solutions didn&#8217;t fit the bill, although they do cover their requirements in depth.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.itproportal.com/features/what-a-saas-outage-taught-me-about-the-meaning-of-partnerships/" target="_blank">What a SaaS outage taught me about the meaning of partnerships</a></div>
<div class="sreweekly-description">
<p>When I signed on for my first SRE position, I had no idea how huge a part vendor relations would play in ensuring reliability.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.linkedin.com/blog/2017/05/building-the-sre-culture-at-linkedin" target="_blank">Building the SRE Culture at LinkedIn</a></div>
<div class="sreweekly-description">
<p>Initially, LinkedIn&#8217;s SRE team hired engineers only based on technical skill. As they&#8217;ve grown, they&#8217;ve discovered the importance of collaboration skills as well.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://blog.statuspage.io/incident-communication-best-practices" target="_blank">Incident communication best practices</a></div>
<div class="sreweekly-description">
<p>StatusPage.io explains the reasons for having a solid incident communication policy and guides you through setting one up.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://queue.acm.org/detail.cfm?id=3096459" target="_blank">The Calculus of Service Availability</a></div>
<div class="sreweekly-description">
<p>As the title suggest, this ACM Queue article goes into some depth on the kinds of calculations one might make when designing a reliable system. Specifically, they focus on service dependencies and introduce Google&#8217;s &#8220;rule of the extra 9&#8221;: a dependency should have one more nine of reliability than the thing that critically depends on it.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/articles/it-takes-more-than-a-circuit-breaker-to-create-a-r" target="_blank">It Takes More Than a Circuit Breaker to Create a Resilient Application</a></div>
<div class="sreweekly-description">
<blockquote><p>At the next conference, when somebody tries to sell you a circuit breaker talk, tell them that this is only the starter and ask for the main course.</p></blockquote>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://patch.com/washington/seattle/starbucks-down-stores-across-country-affected-reported-outage">Starbucks</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">A server outage halted sales at many stores, and some gave out free drinks to mollify customers. Coincidentally, I also was unable to order at Wendy&#8217;s the other night due to a &#8220;server update&#8221;, and they offered me a free Frosty.</li>
</ul>
</li>
<li><a href="https://letsencrypt.status.io/pages/incident/55957a99e800baa4470002da/591e962c4f9ef22239001819">Let&#8217;s Encrypt</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Certificate issuance was impaired for about 17 hours. They also had an <a href="https://letsencrypt.status.io/pages/incident/55957a99e800baa4470002da/591ed0da457ea42d38001796">OCSP outage</a> around the same time, but as far as I can tell, this <a href="https://www.trustwave.com/Resources/SpiderLabs-Blog/Defective-By-Design----Certificate-Revocation-Behavior-In-Modern-Browsers/">wouldn&#8217;t actually cause any impact</a> to end-users of Let&#8217;s Encrypt certificates.</li>
</ul>
</li>
<li><a href="http://www.dailymail.co.uk/sciencetech/article-4522504/Twitter-Glitch-panics-users-worldwide.html">Twitter</a></li>
<li><a href="http://allafrica.com/stories/201705190233.html">Whatsapp</a></li>
<li><a href="http://www.dslreports.com/shownews/ATT-Gets-Light-FCC-Wrist-Slap-For-Largest-911-Outage-Ever-139600">AT&amp;T Gets Light FCC Wrist Slap For Largest 911 Outage Ever</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">The FCC released a report on AT&amp;T&#8217;s 911 outage last March. The cause was apparently a faulty whitelist update.</li>
</ul>
</li>
<li><a href="http://www.express.co.uk/life-style/science-technology/805454/Instagram-Down-Photo-Sharing-Service-Not-Working">Instagram</a></li>
</ul>
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