What 'Attaching a Runner' Really Means in DevOps and Why It Matters
In CI/CD pipelines, 'attaching a runner' refers to connecting a physical or virtual machine that actually executes deployment jobs — a concept often overlooked by developers new to DevOps. Tools like Jenkins and Octopus Deploy are simply user-facing interfaces; every pipeline job still runs on a machine that someone must provision and pay for. At enterprise scale, with frequent merges and deployments, runner infrastructure costs — whether on Kubernetes clusters, cloud-native services, or self-hosted machines — can grow significantly. A low-cost alternative is a self-hosted runner on hardware like a Raspberry Pi, which GitHub Actions supports natively via an outbound polling connection that requires no port forwarding or inbound firewall changes. This architecture means pipeline jobs run at near-zero ongoing cost once the runner is registered, making it practical for small or experimental projects.
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