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<article id="post-689" class="single-view post-689 post type-post status-publish format-standard hentry category-general" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-134/">SRE Weekly Issue #134</a></h1>
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<div class="entry-byline cf">
<div class="entry-date" itemprop="datePublished" >
<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-134/">August 12, 2018</a>
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<div class="entry-content cf" itemprop="text" >
<a href="https://sreweekly.com/sre-weekly-issue-134/" title="Permalink to SRE Weekly Issue #134" class="email_only">View on sreweekly.com</a>
<div class="sreweekly-sponsor-message" style="border: 1px solid #b0b0b0; padding-left: 1rem; padding-right: 1rem; width: 80%; align: center; margin: 2rem auto 2rem auto;">
<h2 style="text-align: center; font-size: 55%; color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>Sr. Software Engineer, Greg Frank, discusses a tool using simulated chaos and validators to improve SRE. See part one of the series to learn more about this tool for supporting your own SRE efforts:</p>
<p><a href="http://try.victorops.com/sreweekly/simulators-and-validators-for-sre">http://try.victorops.com/sreweekly/simulators-and-validators-for-sre</a></p>
</div>
<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://isc.sans.edu/forums/diary/What Do I Need To Know about SegmentSmack/23964/" target="_blank">What Do I Need To Know about &#8220;SegmentSmack&#8221;</a></div>
<div class="sreweekly-description">
<p>The big news this week is SegmentSmack, a denial of service vulnerability in the Linux kernel that allows an attacker to cause high CPU consumption. Linked is a SANS Technology Institute researcher&#8217;s summary of the attack. Other coverage:</p>
<ul>
<li><a href="https://aws.amazon.com/security/security-bulletins/AWS-2018-018/">AWS</a></li>
<li><a href="https://blogs.akamai.com/2018/08/linux-kernel-tcp-vulnerability.html">Akamai</a></li>
<li><a href="https://www.fastly.com/security-advisories/vulnerability-linux-kernel-tcp-implementation">Fastly</a></li>
<li><a href="https://www.kb.cert.org/vuls/id/962459">CERT</a></li>
<li><a href="https://usn.ubuntu.com/3732-2/">Ubuntu</a></li>
<li><a href="https://access.redhat.com/articles/3553061">Redhat</a></li>
</ul>
<p><small>Johannes B. Ullrich, PhD — SAN Technology Institute</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://bytes.grubhub.com/how-to-manage-changing-requirements-for-a-high-availability-service-4715750576bc" target="_blank">How to manage changing requirements for a high availability service</a></div>
<div class="sreweekly-description">
<p>It&#8217;s rare that any system we create will remain static throughout its lifetime. How can you handle retrofitting it without sacrificing reliability?</p>
<p><small>Yiwei Liu — Grubhub</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://githubengineering.com/glb-director-open-source-load-balancer/" target="_blank">GLB: GitHub’s open source load balancer</a></div>
<div class="sreweekly-description">
<blockquote><p>We’ve previously introduced GLB, our scalable load balancing solution for bare metal datacenters [&#8230;] Today we’re excited to share more details about our load balancer’s design, as well as release the GLB Director as open source.</p></blockquote>
<p><small>Theo Julienne — GitHub</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.hostedgraphite.com/2018/08/07/the-secrets-of-load-balancing-long-lived-tcp-connections/" target="_blank">The Secrets of Load-balancing Long Lived TCP Connections</a></div>
<div class="sreweekly-description">
<p>HostedGraphite had a load-balancing challenge: some connections carried 5 data points per second while others had 5000. Here&#8217;s how they solved it.</p>
<p><small>Ciaran Gaffney — HostedGraphite</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.grab.com/quotas-service" target="_blank">How we designed the Quotas microservice to prevent resource abuse</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s how Grab designed their global rate-limiting system, ensuring nearly instant local rate-limiting decisions controlled asynchronously by a global service.</p>
<p><small>Jim Zhan and Gao Chao — Grab</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.infoq.com/articles/envoy-service-mesh-cascading-failure" target="_blank">Envoy Service Mesh Case Study: Mitigating Cascading Failure at Lyft</a></div>
<div class="sreweekly-description">
<p>Find out how Lyft avoids cascading failure in their microservice-based architecture, through the use of a client- and server-side rate-limiting proxy.</p>
<p><small> Daniel Hochman and Jose Nino — Lyft</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://increment.com/documentation/post-mortems-to-the-rescue/" target="_blank">Post-mortems to the rescue</a></div>
<div class="sreweekly-description">
<blockquote><p>A good post-mortem process is broken down into three major parts, the first of which will usually take up the bulk of your time:</p>
<ul>
<li>Writing a post-mortem.</li>
<li>Reviewing the post-mortem and publishing the post-mortem.</li>
<li>Tracking the post-mortem.</li>
</ul>
<p>Let’s go through each step in more detail.</p></blockquote>
<p><small>Sweta Ackerman — Increment</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.foxbusiness.com/media/john-oliver-viewers-not-hackers-responsible-for-fcc-system-outage" target="_blank">John Oliver viewers, not hackers, responsible for FCC system outage</a></div>
<div class="sreweekly-description">
<p>The FCC blamed their outage this past May on a DDoS. Turns out it was just massively distributed requests for legitimate service.</p>
<p><small>Thomas Barrabi — Fox Business</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://read.acloud.guru/why-you-cant-effectively-debug-your-modern-systems-with-dashboards-57fe3ecd26bf" target="_blank">You can’t debug systems with dashboards</a></div>
<div class="sreweekly-description">
<p>My favorite part of this interview with Charity Majors is the discussion of operations in a serverless infrastructure (toward the end).</p>
<p><small>Forrest Brazeal — A Cloud Guru</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://www.traviscistatus.com/incidents/118bjpkgkg00">Travis CI</a></li>
<li><a href="https://www.google.com/appsstatus#hl=en&amp;v=issue&amp;sid=0&amp;iid=1cb41110feccbe06b3596f7b58effa05">Google G Suite administrator console</a></li>
<li><a href="https://status.datadoghq.com/incidents/g43bjgbxxs0t">Datadog</a></li>
<li><a href="https://status.cloud.google.com/incident/cloud-networking/18013#18013006">Google Compute Engine</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">This is a followup analysis of an outage that occurred on July 27.<br />
<blockquote><p>The issue was caused by an unintended side effect of a configuration change [&#8230;]</p></blockquote>
</li>
</ul>
</li>
</ul>
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