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AWS S3 2017: the command that removed too many servers
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Changes and config: 0 of 8Data: 0 of 8Networks and DNS: 0 of 8Capacity and cascades: 0 of 8Security: 0 of 8
One pillar per part. It fills as you finish its chapters.

The path

Changes and config: 0 of 8Changes and config

  1. AWS S3 2017: the command that removed too many servers 1
  2. Cloudflare 2019: the WAF rule that used all the CPU 2
  3. Google Compute Engine 2016: the config push that withdrew every IP block 3
  4. Cloudflare 2022: the BGP policy change that took 19 data centers offline 4
  5. Knight Capital 2012: the old code left on one of eight servers 5
  6. Atlassian 2022: the script that deleted 883 sites 6
  7. Google Cloud 2025: the quota policy with blank fields 7
  8. Cloudflare 2025: the Bot Management feature file that doubled in size 8

Data: 0 of 8Data

  1. GitLab 2017: the deleted database directory 9
  2. Sentry 2015: PostgreSQL transaction ID wraparound 10
  3. Mandrill 2019: the shard that stopped taking writes 11
  4. GoCardless 2017: the database cluster that did not fail over 12
  5. Roblox 2021: the 73-hour Consul outage 13
  6. Let's Encrypt 2020: the CAA recheck that checked one name 14
  7. Anthropic 2025: three bugs that degraded Claude's answers 15
  8. Stripe 2019: a shard that could not elect a primary 16

Networks and DNS: 0 of 8Networks and DNS

  1. Facebook 2021: the backbone that took its own DNS offline 17
  2. Slack 2021: an overloaded Transit Gateway on the first workday of the year 18
  3. AWS us-east-1 2025: a race in DynamoDB's DNS automation 19
  4. OpenAI 2024: a telemetry service that overloaded the Kubernetes control planes 20
  5. Reddit 2023: the Kubernetes upgrade that removed a node label 21
  6. Cloudflare 1.1.1.1 2025: the resolver prefixes withdrawn by a test change 22
  7. Datadog 2023: the automatic OS update that cut nodes off the network 23
  8. Cloudflare 2020: the Atlanta router change that pulled in the backbone’s traffic 24

Capacity and cascades: 0 of 8Capacity and cascades

  1. AWS Kinesis 2020: the capacity addition that hit an OS thread limit 25
  2. Google 2020: the User ID Service that ran out of quota 26
  3. Cloudflare 2023: the data center that lost all power 27
  4. Joyent 2014: every server in us-east-1 rebooted at once 28
  5. AWS 2021: congestion on the internal network in us-east-1 29
  6. Heroku 2025: the OS update that cut dyno networking 30
  7. Monzo 2017: linkerd, Kubernetes and a payments outage 31
  8. Square 2017: retries that overloaded merchant authentication 32

Security: 0 of 8Security

  1. CircleCI 2023: a stolen session and every customer secret 33
  2. Heroku 2022: stolen GitHub OAuth tokens 34
  3. Codecov 2021: a modified Bash Uploader in customers’ CI 35
  4. npm event-stream 2018: the new maintainer and the hidden payload 36
  5. npm left-pad 2016: the unpublished package that broke builds 37
  6. Cloudflare 2023: the credentials left over from the Okta breach 38
  7. LastPass 2022: a developer's home computer and the backup keys 39
  8. Matrix.org 2019: the outdated Jenkins and the forwarded SSH keys 40