CircleCI experienced a major outage affecting customers running Docker jobs. Jobs were queuing rather than starting, with many stuck in a "preparing environment" state for extended periods. The issue has now been resolved.
CircleCI is a continuous integration and deployment platform widely used by development teams to automate testing and deployment workflows.
The company began investigating reports of delays on Docker job startups, identified the underlying cause, and deployed a fix. Engineers observed the job backlog clearing as the mitigation took effect, with Docker jobs returning to normal startup times. Customers who submitted jobs during the incident window may still see some elevated queue times, though newly submitted jobs are starting normally.
The incident is now marked resolved.