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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-61/">SRE Weekly Issue #61</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-61/">February 26, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-61/" title="Permalink to SRE Weekly Issue #61" class="email_only">View on sreweekly.com</a>
<p>A fairly large Outages section this week as I experiment with including post-analyses there even for older incidents.</p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/7-steps-avoiding-downtime/" target="_blank">7 Steps to Avoiding Downtime</a></div>
<div class="sreweekly-description">
<p>Every week, there&#8217;s an article with a title like this (just like with &#8220;costs of downtime&#8221;). Almost every week, they&#8217;re total crap, but this one from PagerDuty is a bit better than the rest. The bit that interests me is the assertion that a microservice-based architecture &#8220;makes maintenance much easier&#8221; and &#8220;makes your app more resilient&#8221;. Sure it can, but it can also just mean that you <a href="https://xkcd.com/927/">trade</a> one problem for <a href="http://searchitoperations.techtarget.com/news/450304823/Uber-hits-bumps-in-the-road-with-microservices-challenges">1300 problems</a>.</p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/optimizing-alert-management/" target="_blank">Optimizing Your Alert Management Process</a></div>
<div class="sreweekly-description">
<blockquote><p>Coping with that complexity requires a different approach to monitoring and alert management. You need to do much more than treat incident management as a process of responding to alerts in the order they come in or assuming that every alert requires action.</p>
<p>This post explains why a flexible, nuanced approach to alert management is vital, and how to implement it.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/HighScalability/~3/z4Syb9_rNzM/scaling-hellofresh-api-gateway.html" target="_blank">Scaling @ HelloFresh: API Gateway</a></div>
<div class="sreweekly-description">
<p>HelloFresh live-migrated their infrastructure to an API gateway to facilitate a transition to microservices. They kindly wrote up their experience, which is especially educational because their first roll-out attempt didn&#8217;t go as planned.</p>
<blockquote><p>[&#8230;] our first attempt at going live was pretty much a disaster. Even though we had a quite nice plan in place we were definitely not ready to go live at that point.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/production-ready/the-pros-and-cons-of-eating-your-own-dog-food-f76f0ebadbcc" target="_blank">The Pros and Cons of Eating Your Own Dog Food — Production Ready</a></div>
<div class="sreweekly-description">
<p>In this issue, Mathias shows us the benefits of &#8220;<a href="http://www.urbandictionary.com/define.php?term=dogfooding+%28to+dogfood%29&amp;defid=1187558">dogfooding</a>&#8221; and cases where it can break down. I like the way the feedback loop is shortened, so that developers feel a painful user experience and have incentive to quickly fix it. It reminds me a lot of the feedback loop you get when developers go on call for the services they write.</p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.netsil.com/making-sense-of-the-application-monitoring-landscape-bd9ae2e60233#.2cnthryd9" target="_blank">Making Sense of the Application Monitoring Landscape</a></div>
<div class="sreweekly-description">
<p>A breakdown of four categories of monitoring tools using the &#8220;2&#215;2&#8221; framework. I like the mapping of &#8220;personas&#8221; (engineering roles) to the monitoring typesa they tend to find most useful.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://blog.cloudflare.com/incident-report-on-memory-leak-caused-by-cloudflare-parser-bug/">Cloudflare: &#8220;Cloudbleed&#8221;</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Cloudflare experienced a minor outage due to mitigating a major leak of private information. They posted this (incredibly!) detailed analysis of the bug and their response to it. Other vendors such as <a href="https://www.pagerduty.com/blog/cloudbleed-vulnerability/">PagerDuty</a>, <a href="&quot;https://monzo.com/blog/2017/02/24/cloudbleed/">Monzo</a>, <a href="https://www.techdirt.com/articles/20170224/16145636783/just-to-be-safe-were-resetting-all-techdirt-passwords-response-to-cloudbleed.shtml">TechDirt</a>, and <a href="https://news.ycombinator.com/item?id=13729004">MaxMind</a> posted responses to the outage. There&#8217;s also this handy <a href="https://github.com/pirate/sites-using-cloudflare/blob/master/README.md">list of sites using cloudflare</a>.</li>
</ul>
</li>
<li><a href="http://status.mailgun.com/incidents/p9nxxql8g9rh">mailgun</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Here&#8217;s a really interesting postmortem for a Mailgun outage I <a href="http://sreweekly.com/sre-weekly-issue-55/">linked to</a> in January. What apparently started off as a relatively minor outage was significantly exacerbated &#8220;due to human error&#8221;. The intriguing bit: the &#8220;corrective actions&#8221; section makes no mention at all of process improvements to make the system more resilient to this kind of error.</li>
</ul>
</li>
<li><a href="http://users.csc.calpoly.edu/~jdalbey/SWE/Papers/att_collapse.html">All Circuits are Busy Now: The 1990 AT&amp;T Long Distance Network Collapse</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">In 1990, the entire AT&amp;T phone network experienced a catastrophic failure, and 50% of all calls failed. The analysis is pretty interesting and shows us that a simple bug can break even an incredibly resilient distributed system.<br />
<blockquote><p>the Jan. 1990 incident showed the possibility for all of the modules to go &#8220;crazy&#8221; at once, how bugs in self-healing software can bring down healthy systems, and the difficulty of detecting obscure load- and time-dependent defects in software.</p></blockquote>
</li>
</ul>
</li>
<li><a href="https://vzaar.com/blog/2017/02/22/mondays-outage-what-happened-how-well-prevent-it-from-happening-again/">vzaar</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">They usually fork a release branch off of master, test it, and push that out to production. This time, they accidentally pushed master to production. How do I know that? Because they published this excellent post-analysis of the incident just two days after it happened.</li>
</ul>
</li>
<li><a href="http://www.themarshalltown.com/u-s-homeland-security-employees-get-locked-out-of-computer-networks-officials-blame-presidents-day-report/23057">U.S. Dept. of Homeland Security</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">This article has some vague mention of an expired certificate.</li>
</ul>
</li>
<li><a href="https://9to5google.com/2017/02/21/its-not-just-you-youtube-is-down-for-many/">YouTube</a></li>
<li><a href="https://www.facebook.com/cdbaby/posts/10154989848889330">CD Baby</a></li>
<li><a href="http://www.dailymail.co.uk/news/article-4248540/Users-Britain-report-problems-Facebook.html">Facebook</a></li>
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