# Cloud outage

> When a cloud provider fails and many apps and websites go down with it.

- Level: Basic
- Topics: Cloud
- URL: https://tidbit.legios.com.ar/cloud-outage/
- In Spanish: [Caída de la nube](https://tidbit.legios.com.ar/es/cloud-outage/)

A **cloud outage** is when part of a cloud provider stops working: servers, storage, the network or one of its key internal services. Because so many companies rent their computers from the same few providers, a single failure can knock out banks, stores, games and messaging apps at the same time, even though none of them did anything wrong.

Outages rarely start with a whole data center burning down. More often a small mistake spreads. In February 2017, a mistyped command during routine work took down Amazon S3 in AWS's Northern Virginia region (US-EAST-1) for hours, and many websites broke with it. In October 2025, a DNS problem with DynamoDB in that same region set off failures across many AWS services, and popular apps were down for many hours.

Providers run public status pages and, after big events, publish a written summary of what went wrong. For companies, the lesson is to design for failure: spread copies across availability zones or even regions, know what depends on what, and have a plan for running in a reduced mode. For everyone else, it is a reminder that the cloud is real buildings full of machines run by people.

## An analogy

Like a power cut in a shopping mall: every shop is fine on its own, but they all share the same electricity, so when it fails the whole mall goes dark at once.

## Keep in mind

- One provider failure can take down many unrelated apps at once.
- Big outages often start small, with a change or a configuration mistake.
- Providers publish status pages and summaries after major events.
- Spreading across zones and regions limits the damage.

## Go deeper

- [AWS Post-Event Summaries](https://aws.amazon.com/premiumsupport/technology/pes/)
- [Google Cloud Service Health](https://status.cloud.google.com/)
- [Downtime on Wikipedia](https://en.wikipedia.org/wiki/Downtime)

## Related terms

- [Cloud computing](https://tidbit.legios.com.ar/cloud-computing/): Renting computers over the internet instead of buying your own.
- [Server](https://tidbit.legios.com.ar/server/): A computer whose job is to answer requests from other computers, all day, every day.
- [Data center](https://tidbit.legios.com.ar/data-center/): A building full of servers where the internet, the cloud and AI actually run.
- [Amazon S3](https://tidbit.legios.com.ar/amazon-s3/): A giant online drawer for files, rented by the gigabyte.
- [Regions and Availability Zones](https://tidbit.legios.com.ar/regions-and-availability-zones/): Where AWS physically lives: cities worldwide, each split into separate data centers.
- [Website](https://tidbit.legios.com.ar/website/): A set of web pages under one address, stored on a server and opened in a browser.
- [DNS](https://tidbit.legios.com.ar/dns/): The internet's phone book: it turns names like wikipedia.org into IP addresses.
- [Amazon DynamoDB](https://tidbit.legios.com.ar/amazon-dynamodb/): A key-value database that answers in milliseconds no matter how big the table gets.