SPRINGFIELD, Mo. — A worldwide outage caused by a DNS database issue with Amazon's cloud provider disrupted various services yesterday.

The outage affected apps, websites, and even airports, causing services that relied on Amazon's cloud to slow down or shut down entirely. The incident has raised concerns about the reliability of cloud services.

"If you've got one cloud provider and that provider has an issue, as we had yesterday, then obviously you're going to be down and it's going to cost a lot of money," said Shannon McMurtrey, associate professor of cyber-risk management at Drury University, "So what smart companies do is they'll have a backup."

McMurtrey emphasized the importance of having a strategy in place in case of a failure like this, such as being able to move over to a dif

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