Docker in this unprivileged Proxmox LXC was broken two independent ways: AppArmor could not load the docker-default profile, so the daemon could not start any new container, and runc could not set the net.ipv4.ip_unprivileged_port_start sysctl, which is why every service needed network_mode: host. `docker build` was impossible outright since Docker 29 removed the classic builder. The stack only survived because the containers predated the breakage - a reboot would have left the app down, and nothing could be redeployed. Postgres, MinIO and the app now run natively under systemd. Deploys build out-of-place into releases/<sha> and swap a symlink, so the build happens while the old release keeps serving and downtime is the ~3s restart rather than the ~3min build. Rollback is the same swap in reverse with no rebuild. Dockerfile and docker-compose.prod.yml are unchanged and still work on a normal host; the compose app service gains `build: .` so it can come up on a VPS that cannot reach the LAN-only Gitea registry. Documents three traps found during the migration: rewrites() in next.config.mjs is evaluated at build time so MINIO_ENDPOINT changes silently do nothing, prisma migrate deploy would fail because production has no _prisma_migrations table, and the image proxy relies on the bucket's anonymous-download policy. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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