self-hosted-runner-hardening

Harden self-hosted GitHub Actions runners by applying defense-in-depth controls including OS-level baselines, network isolation, credential protection, and audit logging to reduce the host attack surface.

Defense in depth for CI runners involves layering OS hardening, user permission controls, filesystem restrictions, AppArmor profiles, sudo rules, and runtime confinement to prevent persistence and data exfiltration.

Yes, you can apply AppArmor profiles for process confinement on self-hosted GitHub Actions runners to restrict runtime capabilities and limit potential lateral movement from compromised workflows.

Self-hosted runner hardening applies to Linux-based CI runners in both on-premises and cloud environments, enforcing consistent security baselines, network isolation, and auditable controls across deployments.

The best way to isolate runners and prevent credential theft is enforcing network isolation, filesystem restrictions, user permission controls, and runtime confinement to minimize exposure of sensitive tokens.

You need OS hardening for GitHub Actions runners when deploying self-hosted infrastructure that executes untrusted workflows, requiring strict sudo rules and service isolation to mitigate OS-level vulnerabilities.