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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-46/">SRE Weekly Issue #46</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-46/">October 30, 2016</a>
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<a href="https://sreweekly.com/sre-weekly-issue-46/" title="Permalink to SRE Weekly Issue #46" class="email_only">View on sreweekly.com</a>
<p>This may be the biggest issue to date. Lots of great articles this week, plus updates from the Dyn DDoS, and of course all of the awesome content I held off on posting last week.</p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://codeascraft.com/2016/10/19/being-an-effective-ally-to-women-and-non-binary-people/" target="_blank">Being an Effective Ally to Women and Non-Binary People</a></div>
<div class="sreweekly-description">
<p>I&#8217;ve linked to several posts on Etsy&#8217;s <i>Code as Craft</i> blog in the past, and here&#8217;s another great one. Perhaps not the typical SRE article you might have been expecting me to link to, but this stuff is important in <i>every</i> tech field, including SRE. We can&#8217;t succeed unless every one of us has a fair chance at success.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.pcworld.com/article/2365602/hacker-puts-full-redundancy-codehosting-firm-out-of-business.html" target="_blank">Hacker puts &#8216;full redundancy&#8217; code-hosting firm out of business</a></div>
<div class="sreweekly-description">
<p>In 2014, CodeSpaces suffered a major security breach that abruptly ended their business. I&#8217;d say that&#8217;s a pretty serious reliability risk right there, showing that security and reliability are inextricably intertwined.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://pages.catchpoint.com/OUTAGE-AMA.html" target="_blank">OUTAGE! AMA</a></div>
<div class="sreweekly-description">
<p>Check it out! Catchpoint is doing another Ask Me Anything, this time about incident response. Should be interesting!</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://m.youtube.com/watch?v=Sj0sdbiyatk" target="_blank">Complex System Failures and Blameless Retrospectives by Courtney Eckhardt</a></div>
<div class="sreweekly-description">
<p>My fellow Heroku SRE, Courtney Eckhardt, expanded on a section of our joint SRECon talk for this session at <a href="http://www.osfeels.com">OSFeels</a>. She had time for Q&amp;A, and there were some really great questions!</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/production-ready/the-power-of-less-code-56764e2cd534#.4xunt244j" target="_blank">The Power of Less Code</a></div>
<div class="sreweekly-description">
<p>Mathias rocks it, as usual, in this latest issue of <i>Production Ready</i>.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://techblog.netflix.com/2016/10/netflix-chaos-monkey-upgraded.html" target="_blank">The Netflix Tech Blog: Netflix Chaos Monkey Upgraded</a></div>
<div class="sreweekly-description">
<p>Netflix has released a new version of Chaos Monkey with some interesting new features.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://blog.scalyr.com/2016/10/the-myth-of-the-root-cause/" target="_blank">The Myth of the Root Cause: How Complex Web Systems Fail</a></div>
<div class="sreweekly-description">
<p>Scalyr worked with Mathias Lafeldt to turn his already-awesome <a href="https://medium.com/production-ready/how-complex-web-systems-fail-part-1-4aaffc11e0c7">pair</a> of <a href="https://medium.com/production-ready/how-complex-web-systems-fail-part-2-1b1afb4fa7be">articles</a> into this excellent essay. He brings in real-world examples of major outages and draws conclusions based on them. He also hits on a number of other topics he&#8217;s written about previously. Great work, folks!</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://githubengineering.com/octocatalog-diff-github-s-puppet-development-and-testing-tool/" target="_blank">octocatalog-diff: GitHub’s Puppet development and testing tool &#8211; GitHub Engineering</a></div>
<div class="sreweekly-description">
<p>How many times have you pushed out a puppet change that you tested very thoroughly, only to find that it did something unexpected on a host you didn&#8217;t even think it would apply to? Etsy&#8217;s solution to that is this tool that shows catalog changes for all host types in your fleet in a diff-style format.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.techrepublic.com/article/pokemon-go-how-the-cloud-saved-the-smash-hit-game-from-collapse/" target="_blank">Pokemon Go: How the cloud saved the smash hit game from collapse</a></div>
<div class="sreweekly-description">
<blockquote><p>&#8220;We ended up 50 percent over our worst case after day one, we figured this was going to be bad within six hours&#8221;</p></blockquote>
<p>It&#8217;s pretty impressive to me that Niantic managed to keep Pokemon Go afloat as well as they did. They worked very closely with Google to grow their infrastructure much faster than they had planned to.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/serverdensity/~3/u9DJxFV_7H8/" target="_blank">Spotify Engineering: Making Ops Human</a></div>
<div class="sreweekly-description">
<p>As Spotify has grown to 1400 microservices and 10,000 servers, they&#8217;ve moved toward a total ownership model, in which development teams are responsible for their code in production.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://royal.pingdom.com/2016/10/24/ddos-attack-affects-pingdom/" target="_blank">How the Friday DDoS attack affected Pingdom</a></div>
<div class="sreweekly-description">
<p>Pingdom suffered a major outage during the Dyn DDoS, not only due to their own DNS-related issues, but also due to the massive number of alerts their system was trying to send out to notify customers that their services were failing.</p>
<blockquote><p>[&#8230;] at 19:20 we went to DEFCON 1 and suspended the alerting service altogether.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://dyn.com/blog/dyn-analysis-summary-of-friday-october-21-attack/" target="_blank">Dyn Analysis Summary Of Friday October 21 Attack</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s Dyn&#8217;s write-up of the DDoS.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/service-disruption-root-cause-analysis-follow-actions-october-21st-2016/" target="_blank">Service Disruption Root Cause Analysis and Follow-up Actions from October 21st, 2016</a></div>
<div class="sreweekly-description">
<p>As they promised, here&#8217;s PagerDuty&#8217;s root cause analysis from the Dyn DDoS.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.ably.io/routing-around-single-point-of-failure-dns-issues-7c20a8757903#.9paqmyma9" target="_blank">Routing around single point of failure DNS issues</a></div>
<div class="sreweekly-description">
<p>This is a pretty great idea. Ably has written their client libraries to reach their service through a secondary domain if the primary one is having DNS issues. Interestingly, their domain, <tt>ably.io</tt>, was also impacted by the <tt>.io</tt> TLD DNS outage (detailed below) just days after they wrote this.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://blog.statuspage.io/looking-back-on-the-largest-ddos-in-history" target="_blank">Looking Back On The Largest DDoS In History</a></div>
<div class="sreweekly-description">
<p>StatusPage.io gives us some really interesting numbers around the Dyn DDoS, based on status posts made by their customers.  I wonder, was it really the largest in history?</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.infoq.com/news/2016/10/Serverless-Operations" target="_blank">Serverless Operations is Not a Solved Problem</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s a nice write-up of day one of ServerlessConf, with the theme, &#8220;NoOps isn&#8217;t a thing&#8221;.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://aws.amazon.com/blogs/aws/new-aws-server-migration-service/" target="_blank">AWS Server Migration Service</a></div>
<div class="sreweekly-description">
<p>Not a magic bullet, but still pretty interesting.</p>
<blockquote><p>[&#8230;] it allows you to incrementally replicate live Virtual Machines (VMs) to the cloud without the need for a prolonged maintenance period. You can automate, schedule, and track incremental replication of your live server volumes, simplifying the process of coordinating and implementing large-scale migrations that span tens or hundreds of volumes.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.technologydecisions.com.au/content/security/news/reset-router-could-have-saved-census-80336641" target="_blank">Reset router could have saved Census</a></div>
<div class="sreweekly-description">
<p>Earlier this year, Australia&#8217;s online census site suffered a major outage. Here&#8217;s a little more detail into what went wrong. TL;DR: a router dropped its configuration on reboot.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/serverdensity/~3/6SWqyz9HePI/" target="_blank">How GOV.UK Reduced their Incidents and Alerts</a></div>
<div class="sreweekly-description">
<p>Gov.uk has put in place a lot of best practices in incident response and on-call health.</p>
<blockquote><p>After extensive rationalisation, GOV.UK have reached a stage where only 6 types of incidents can alert (wake them up) out of hours. The rest can wait until next morning.</p></blockquote>
<p>Unfortunately, I&#8217;m guessing one of those six types happened this week, as you can see in the Outages section below.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://news.ycombinator.com/item?id=12813065">.io TLD</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<p>The entire <tt>.io</tt> top-level domain went down, resulting in impact to a lot of trendy companies that use <tt>*.io</tt> domains. It doesn&#8217;t matter how many DNS providers you have for your domain if your TLD&#8217;s nameservers aren&#8217;t able to give out their IPs. Worse yet, <tt>.io</tt>&#8216;s servers sometimes <i>did</i> respond, but with an incorrect NXDOMAIN for valid domains. <tt>.io</tt>&#8216;s <a href="http://www.zytrax.com/books/dns/ch8/soa.html">negative-caching TTL</a> of 3600 seconds made this pretty nasty.</p>
<p>On the plus side, this outage provided the last piece in the puzzle in answering my question, &#8220;does &#8216;fast-fluxing&#8217; your DNS providers really work?&#8221;. Answer: no. I&#8217;ll write up all of my research soon and post a link to it here.</p>
</li>
</ul>
</li>
<li><a href="http://www.christiantoday.com/article/the.pirate.bay.news.tpb.now.back.online.after.weekend.downtime/98713.htm">The Pirate Bay</a></li>
<li><a href="https://www.dmv.ca.gov/portal/dmv/detail/about/field_office_outage_update?lang=en">California DMV</a></li>
<li><a href="http://nbc4i.com/2016/10/28/att-users-report-major-phone-service-outage/">AT&amp;T</a></li>
<li><a href="http://www.itproportal.com/news/bt-internet-outage-affects-thousands-across-the-uk/">British Telecom</a></li>
<li><a href="http://metro.co.uk/2016/10/26/fears-of-cyberattack-on-uk-government-as-entire-gov-uk-website-goes-down-6216800/">gov.uk</a></li>
<li><a href="https://www.vg247.com/2016/10/26/all-psn-services-are-down-sony-investigating/">PlayStation Network</a></li>
</ul>
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