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Release It!, 2nd Edition by Michael T. Nygard

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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:

  1. First, the admins shut down their autoscaler service so that they could upgrade a ZooKeeper cluster.[12]

  2. Sometime into the upgrade process, the package management system detected the autoscaler was off and restarted it.

  3. The autoscaler came back online and read the partially migrated ZooKeeper ...

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