Optimizing Docker Seccomp & AppArmor Profiles (3749)

Technical Overview

Running containers on heterogeneous edge hardware demands a security posture that does not sacrifice latency or throughput. This guide walks through the end‑to‑end process of profiling syscall usage, generating least‑privilege Seccomp JSON, and authoring AppArmor profiles that map precisely to your workload’s capability set.

1. Syscall Auditing with strace & sysdig

Capture a baseline trace on a representative node:

sysdig -c topfiles container.id=abc123 -w trace.scap

Post‑process with chisel to emit a unique syscall list, then feed that into docker run --security-opt seccomp=profile.json.

2. Building a Minimal Seccomp Profile

Use the oci-seccomp-bpf-hook to compile the JSON into a BPF program, reducing kernel‑user transitions. Example snippet:

{
  "defaultAction": "SCMP_ACT_ERRNO",
  "architectures": ["SCMP_ARCH_X86_64", "SCMP_ARCH_AARCH64"],
  "syscalls": [
    {"names": ["read", "write", "exit", "rt_sigreturn"], "action": "SCMP_ACT_ALLOW"}
  ]
}

3. AppArmor Policy Generation

Leverage aa-genprof in learning mode, then prune with aa-logprof. Enforce path‑based rules for config maps and secret mounts, and deny cap_sys_admin unless explicitly required.

4. Benchmarking Overhead

Run wrk and fio against a baseline (no profiles) vs. hardened profiles. Typical results on a Raspberry Pi 4 (ARM64): ~2.3% CPU overhead, ~1.8% latency increase for HTTP workloads.

5. CI/CD Integration

Embed profile validation in your pipeline using conftest policies and docker scan to prevent regressions.