Dev Tools
Semaphore CI
Semaphore CI is a fast continuous integration and delivery platform used by engineering teams to automate testing and deployment pipelines for their code.
What is Semaphore CI?
Semaphore CI launched in 2012 with a focus on build speed — the team at RenderedText was convinced that slow feedback loops were one of the most under-appreciated drags on developer productivity, and built their infrastructure accordingly. Semaphore CI 2.0, released in 2019, was a complete architectural rebuild: a pipeline-based system with parallel job execution, configurable machine types, and self-hosted agent support replacing the simpler job-queue model of the first version. The service has maintained a reputation for raw execution speed relative to its competitors, with pre-built Docker environments and incremental caching reducing build setup time.
Semaphore CI's pipeline model structures work as directed acyclic graphs of blocks and jobs, where blocks can run in parallel and fan out to multiple concurrent jobs. The pipeline definition lives in a YAML file in the repository, and Semaphore's webhook integration with GitHub, Bitbucket, and GitLab triggers pipeline execution on push and pull request events. Semaphore's agent fleet — both Semaphore-managed and customer self-hosted — executes jobs, with the control plane scheduling jobs to available machines and reporting results back to the Semaphore dashboard and the originating VCS platform.
Semaphore CI service problems manifest in the pipeline execution and result reporting layers. Agent availability reductions cause build queue backlog that grows proportionally to the gap between job submission rate and agent capacity — long queue wait times surface as pipelines that spend most of their elapsed time waiting to start rather than actually running. Webhook reception failures from GitHub or GitLab break the automatic trigger path, requiring developers to manually retrigger pipelines that should have started automatically on push. Result reporting failures cause pipelines that complete successfully to show no status check on the originating pull request, confusing PR authors. Artifact and cache storage failures block jobs that depend on shared build outputs between pipeline stages.
Outage.gg tracks Semaphore CI service status using real-time community reports from development teams. If build queues have long wait times, pipelines are not triggering on push, or status checks are not reporting to PRs, the live status page shows current impact from the Semaphore CI user community.
Common Semaphore CI Problems
Issues users most frequently report when Semaphore CI is having problems.
Login failures
Players are unable to sign in, receiving authentication errors or being stuck on loading screens.
Matchmaking problems
Unable to find or join matches, long queue times, or errors when trying to connect to game servers.
Disconnections mid-session
Getting unexpectedly kicked from active sessions, losing in-game progress or items.
In-game store & purchases
Cannot load the in-game store, complete purchases, or received items are not appearing in inventory.
Frequently Asked Questions
Common questions about Semaphore CI outages and server status.
You can check the live Semaphore CI server status at outage.gg/services/semaphore-ci. The page shows real-time community-submitted outage reports, an hourly trend chart, and the current health status.
Semaphore CI can stop working for a number of reasons including scheduled maintenance windows, unexpected server failures, network infrastructure problems, or DDoS attacks. Check the live status page on Outage.gg for the latest community reports to see if others are experiencing the same issue.
Go to outage.gg/services/semaphore-ci and click the "Report an Issue" button. Your report is counted immediately and helps confirm whether a problem is widespread. Reports from multiple users trigger a status change visible to everyone watching the page.
Click the "Notify Me" bell button on the Semaphore CI status page at outage.gg/services/semaphore-ci. Create a free account and we will send you an email the moment Semaphore CI comes back online — no app download required.
Many services maintain official status pages with planned maintenance notices. Outage.gg aggregates real-time community-reported outages which often surface faster than official channels.
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