Bizarre Ops Nightmares: Real-World Failures That Shocked Engineers

A senior DBA at an e‑commerce company was forced to expand the primary database during a 618 sales peak. Instead of testing in a low‑traffic window, he ran the expansion in production and accidentally executed a script that deleted test data, but with root privileges, wiping core transaction data. The site was down for about four hours, causing multi‑million‑yuan losses, and the most recent backup was three days old, resulting in loss of many new orders.

Another story describes a newcomer to Kubernetes who worked at a small firm that ran everything—including databases and GitLab—on k8s with a single NFS‑backed PV/PVC shared across services. When attempting to delete a service’s PV/PVC, the operation cleared the entire shared directory, erasing all code. A month‑old backup allowed a rollback, but the incident highlighted the danger of shared persistent storage.

A securities company experienced frequent service timeouts during market peaks despite low resource usage on pods and nodes. Investigation revealed that several ESXi hosts were at 100% CPU because a maintenance task had migrated VMs unevenly, overloading nine hosts while three were idle. After rebalancing the VMs, the timeouts disappeared.

In an office using a single installation source for Office 2007, a colleague’s Excel crashed with a blue screen, causing all users to be unable to open documents. Switching temporarily to WPS helped, and a simple reboot of the problematic machine restored normal operation, though the cause remained unclear.

The most extreme incident involved a power‑maintenance error that destroyed servers. A UPS replacement failed, and during the repair a technician mistakenly connected 380 V to a 220 V line, instantly burning out server motherboards, CPUs, and power‑supply MOSFETs. All critical systems—including databases and failover mechanisms—went down. The aftermath led to installing a spare UPS, keeping a backup server on standby, and implementing regular data synchronization with power‑down procedures to prevent future damage.