Tetragon

Tetragon is a self-hosted runtime security tool for Linux, containers, and Kubernetes. It fits security teams that need workload-level evidence and controls enforced close to the kernel. Choose it for synchronous eBPF policy enforcement; look elsewhere if the monitoring agent itself must withstand a host attacker with root access.

Overview

Tetragon observes, filters, and enforces policy in the kernel as events occur. Its Kubernetes-aware model can apply rules by namespace, pod label, and container field, making it useful for separating workload behavior instead of treating an entire host alike. This is a focused runtime control plane, not a complete defense against someone who already controls the host.

The project is a Cilium sub-project and a CNCF project. It is open source and self-hosted, with deployment choices for Kubernetes, Linux, and containers. Documentation points users to GitHub, product documentation, and the Cilium Slack community for support.

Key features

Kernel enforcement and process evidence

Tetragon can monitor and filter activity, then synchronously enforce policies through eBPF. Execution records identify the binary, command-line arguments, user ID, parent process, and start time. That context helps an analyst distinguish an expected service action from suspicious process behavior, while enforcement can stop a prohibited action rather than merely report it.

Files, credentials, and operating-system integrity

File monitoring covers access and modifications and can block unauthorized file operations at the kernel level. Credential-change monitoring follows user IDs, group IDs, and capabilities at system-call and kernel levels. Tetragon also watches kernel-module loading and unloading and eBPF program loads and interactions, giving teams visibility into changes that could affect host or agent integrity.

Kubernetes and network context

Policies can target namespaces, pod labels, and container fields, with support for containerd and CRI-O. Network telemetry connects events to processes and workloads and follows socket lifecycle, connections, and bytes sent or received. That linkage is more actionable than an unassociated network event when investigating a container.

Output and policy starting points

JSON logs and a gRPC endpoint provide two ways to consume events. The policy library includes documented examples paired with use cases, which can shorten initial configuration. Community examples are not curated for suitability or best practices, so teams must review them before adopting them in production.

Pricing

Tetragon costs nothing. There are no paid plans and no free trial; the open-source project can be installed on Kubernetes, Linux, or as a container. This removes license cost, but self-hosting leaves deployment, policy operation, and ongoing maintenance with your team.

Platforms

Tetragon supports API access, Linux, and self-hosted deployment. The maker documents Kubernetes installation through Helm, Linux installation with released packages, and container deployment using an image from the Tetragon Quay repository. It is built for Linux, container, and Kubernetes workloads rather than a general desktop security suite.

Who it's for

Security teams operating Kubernetes or other Linux workloads should consider Tetragon when they need process, file, privilege, network, and host-integrity telemetry tied to workloads. It is especially suitable where kernel-level blocking is preferable to alert-only monitoring and where the team can run a self-hosted component.

It is a poorer fit for organizations seeking a managed service, broad cross-platform endpoint coverage, or guarantees against a root-level host attacker. The threat model allows such an attacker to disable or manipulate the local agent and its monitoring data.

Pros and cons

Pros

• Synchronous kernel enforcement: eBPF policies can filter and block behavior in real time, not just generate after-the-fact alerts.
• Rich workload context: Process, file, privilege, and network events can be tied to Kubernetes namespaces, pods, containers, and processes.
• Broad open-source deployment: Kubernetes, Linux packages, and container images avoid a license bill and support self-hosted operations.
• Integrity coverage: Kernel-module and eBPF program activity is monitored alongside workload behavior.

Cons

• Root-level boundary: A host attacker with root access can disable or alter the agent and its data.
• Operational responsibility: Self-hosting means your team owns installation, policy quality, and runtime administration.
• Uncurated community policies: Examples outside the documented library require your own suitability and best-practice review.
• Exposed gRPC risk: If the TCP listener is exposed without TLS client verification, network users may modify configuration; secure it with TLS or mutual TLS.

Alternatives

Choose Calico Cloud instead when you want a freemium option with a free trial, web access, and a one-user, one-cluster free plan, accepting 24-hour log retention and a view-only policy editor.

Amazon GuardDuty suits teams wanting a paid, AWS-oriented service with a free trial and pay-as-you-go billing based on analyzed data.

Pick Falco for a free, open-source Linux and self-hosted runtime security project.

KubeArmor is another free, open-source choice for API, Linux, and self-hosted deployments, with workload and platform support varying by its support matrix.

Consider Qualys TotalCloud when a cloud platform subscription and a free evaluation license with limited API calls fit better.

Tracee is a free, Linux-only open-source option that requires a compatible kernel and elevated capabilities.

Bitdefender Total Security is aimed at individual multi-device protection rather than Kubernetes runtime enforcement.

Sysdig Secure is the alternative to investigate when commercial licensing based on host count is acceptable.

For broader comparisons, see Cloud Workload Protection Platforms, Kubernetes Security Software, Container Security Software, and eBPF Observability Tools.

Verdict

Tetragon is a strong choice for Linux and Kubernetes security teams that want detailed runtime evidence and kernel-enforced, workload-aware controls without licensing fees. Its decisive limitation is the root-level host threat, combined with the care required to secure and operate a self-hosted gRPC-enabled agent. Choose it when synchronous eBPF enforcement matters; choose a managed or broader endpoint platform when operational ownership or host-compromise resistance matters more.