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Tailscale-style sidecar pattern: a FIPS container provides mesh networking, and a companion app container shares its network namespace via network_mode: service:fips. Security model: - iptables enforces strict isolation — the app container can only communicate over the FIPS mesh (fd::/8 via fips0) - No IPv4 access: eth0 restricted to FIPS UDP transport (port 2121) - No IPv6 on eth0: ip6tables blocks all eth0 IPv6 traffic - Only fips0 and loopback are reachable from the app container The sidecar accepts peer configuration via environment variables (FIPS_NSEC, FIPS_PEER_NPUB, FIPS_PEER_ADDR), so it can be pointed at any FIPS node without config file generation. Files: - testing/sidecar/: Dockerfile, Dockerfile.app, docker-compose.yml, entrypoint.sh, .env, resolv.conf, scripts/build.sh - testing/sidecar/README.md: security model, quick-start, architecture, DNS resolution, troubleshooting, production considerations - testing/sidecar/scripts/test-sidecar.sh: 3-node chain integration test verifying link establishment, multi-hop connectivity, and network isolation on each app container - .github/workflows/ci.yml: sidecar integration test matrix entry
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Tailscale-style sidecar pattern: a FIPS container provides mesh networking, and a companion app container shares its network namespace via network_mode: service:fips.
Security model:
The sidecar accepts peer configuration via environment variables (FIPS_NSEC, FIPS_PEER_NPUB, FIPS_PEER_ADDR), so it can be pointed at any FIPS node without config file generation.
Files: