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ced4568 d2280d0f0d feat(security): production Compose topology, firewall rulesets, Docker mTLS
Named-bridge-network production Compose (not host networking, unlike dev)
for rn-platform-01; egress-proxy + agents for rn-lab-host-01. Caddy reverse
proxy, single public origin, Grafana restricted to management_cidr.
iptables-restore firewall rulesets for all three hosts (Proxmox host,
rn-platform-01, rn-lab-host-01) codifying the Platform/Lab-Host boundary:
no student-to-student traffic, no direct Proxmox exposure, no direct
Postgres/Provisioner exposure from the Lab Host.

Mutual TLS for the Provisioner<->Lab Host Docker connection: certificate
generation/verification scripts, dockerd TLS config, firewall-restricted
port 2376. Application support already existed since Phase 1; this is
purely the operational half.

Validated: docker compose config, caddy validate, firewall structural lint,
and a real openssl s_server/s_client mTLS handshake proving the cert chain
and mutual-auth rejection (legitimate client verified, rogue client
correctly rejected with verify code 19).
2026-08-18 17:13:09 -05:00

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# Conservative production tuning baseline — deliberately NOT hand-tuned to a specific RAM
# allocation before rn-platform-01's real resources are known (Phase 4 instruction: do not
# over-tune before actual hardware exists). Sized for a modest ~4GB Postgres allocation, safe
# defaults everywhere else. Revisit once VM RAM is final — see docs/PHASE4_PRODUCTION_INFRASTRUCTURE.md §11.
shared_buffers = 1GB
effective_cache_size = 3GB
maintenance_work_mem = 256MB
work_mem = 16MB
max_connections = 100
# WAL — safe defaults for a single-instance setup with pg_dump/pg_basebackup-style backups
# (infra/backup/). Not configured for streaming replication (out of scope this phase — see
# docs/BACKUP_DR.md's DR model for why pg_dump + periodic pg_basebackup is the chosen approach,
# not a hot standby).
wal_level = replica
max_wal_size = 2GB
min_wal_size = 512MB
checkpoint_completion_target = 0.9
# Query logging — slow queries only, never full statement logging (would capture bind
# parameters that can include session tokens' hashes / PII in edge cases). See docs/OBSERVABILITY.md.
log_min_duration_statement = 500
log_line_prefix = '%m [%p] %q%u@%d '
log_checkpoints = on
log_connections = on
log_disconnections = on
# Autovacuum stays on defaults — no reason to disable it for this workload size.