January 2018
Intermediate to advanced
378 pages
11h 34m
English
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Force Multiplier
Like a lever, automation allows administrators to make large movements with less effort. It’s a force multiplier.
Outage Amplification
On August 11, 2016, link aggregator Reddit.com suffered an outage. It was unavailable for approximately ninety minutes and had degraded service for about another ninety minutes.[11] In their postmortem, Reddit admins described a conflict between deliberate, manual changes and their automation platform:
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First, the admins shut down their autoscaler service so that they could upgrade a ZooKeeper cluster.[12]
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Sometime into the upgrade process, the package management system detected the autoscaler was off and restarted it.
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The autoscaler came back online and read the partially migrated ZooKeeper ...