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Bogdan Timofte
authored
3 months ago
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# Madagascar's Thunderbolts
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Thunderbolt networking toolkit for three Proxmox hosts (`baobab`, `ebony`, `tapia`).
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The goal is to bring up a high-MTU Thunderbolt bridge (`thunderbridge`) early in boot,
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enlist hot-plugged Thunderbolt NICs as they appear, and keep management networking
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configs consistent across the cluster.
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## Repository layout
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```
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deploy/attempt1/
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├── common/ # Shared bits copied to every host
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│ ├── systemd/system/
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│ │ ├── tb-bridge.service # Ensures the bridge device exists and is up
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│ │ └── tb-enlist@.service # Enlists hotplugged NICs into the bridge
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│ └── udev/rules.d/
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│ └── 90-…systemd.rules # Starts tb-enlist@ for thunderbolt* devices
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├── baobab/… # Node-specific /etc/network config
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├── ebony/…
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├── tapia/…
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└── deploy_tb.sh # Main deployment script
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```
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The repo currently holds a single deployment attempt (`deploy/attempt1`). If you
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iterate on the design, prefer adding a new attempt directory so older snapshots
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stay reproducible.
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## Standardized lifecycle
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This project now has two distinct operational paths:
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- Full bootstrap: `deploy/attempt1/deploy_tb.sh`
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- can update host-specific network configuration
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- use for initial deployment or deliberate network template rollout
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- Shared runtime reinstall: `./setup.sh`
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- standardizes the shared runtime artifacts only
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- installs/removes `tb-recover.sh`, the shared systemd units, and the udev rule
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- intentionally leaves `/etc/network/interfaces` and `/etc/network/interfaces.d/10-thunderbolt` untouched
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Standardized host paths for the shared runtime:
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- canonical uninstall: `/usr/local/lib/xdev/thunderbolts/uninstall.sh`
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- canonical shared script: `/usr/local/lib/xdev/thunderbolts/tb-recover.sh`
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- operator wrapper: `/usr/local/sbin/tb-recover.sh`
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- installed docs: `/usr/local/share/doc/xdev/thunderbolts`
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Use:
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```bash
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./setup.sh # reinstall shared runtime on baobab ebony tapia
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./setup.sh baobab # single host
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./setup.sh --uninstall baobab
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```
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## Prerequisites
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- Machine with Bash ≥3, `ssh`, and `scp` available.
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- Access to the target hosts as `root` (default username) over the management or
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Thunderbolt network; passwordless SSH is assumed.
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- Target hosts run Proxmox (or any Debian-like system with ifupdown2 and systemd).
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- `ip`, `systemctl`, and `udevadm` available on the remote hosts.
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## How deployment works
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`deploy_tb.sh` is idempotent. For each target host it:
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- Chooses an IP by trying management first, then Thunderbolt (`get_mgmt_ip`/`get_tb_ip`).
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- Uploads shared udev and systemd units that prepare the `thunderbridge` device and
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attach Thunderbolt NICs when they hot-plug.
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- Replaces `/etc/network/interfaces` with the host-specific template and places the
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Thunderbolt overlay in `/etc/network/interfaces.d/10-thunderbolt`.
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- Reloads udev and systemd, triggers network reloads, enables the services, and
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prints a short status report (bridge state, enlisted NICs).
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Run it from inside the attempt directory so relative paths resolve correctly.
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```bash
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cd deploy/attempt1
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./deploy_tb.sh # deploys to baobab, ebony, tapia
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./deploy_tb.sh baobab # deploys to a single host
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./deploy_tb.sh tapia ebony
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```
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## Customising host lists and addresses
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Edit the `get_mgmt_ip()` and `get_tb_ip()` helpers near the top of
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`deploy/attempt1/deploy_tb.sh` to match your environment. Each host that you want
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to target must:
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1. Have a subdirectory named after the host inside `deploy/attempt1`.
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2. Provide the full `/etc/network/interfaces` template.
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3. Provide `etc/network/interfaces.d/10-thunderbolt` with the bridge definition
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and hotplug rules for Thunderbolt interfaces.
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To add a new host, copy one of the existing directories, adjust static IPs and
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interface names, then extend both helper functions so the script can locate it.
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## What the systemd/udev pieces do
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- `tb-bridge.service` (oneshot) makes sure the `thunderbridge` device exists as a
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Linux bridge, sets MTU 65520, and brings it up during early boot.
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- `tb-enlist@.service` attaches Thunderbolt NIC instances to the bridge, aligning
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their MTU and keeping them hotplug friendly; systemd stops the unit cleanly on
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Bogdan Timofte
authored
3 months ago
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device removal and keeps it ordered before `network.target` during shutdown so
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remote filesystems over `thunderbridge` can unmount before the ports detach.
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Bogdan Timofte
authored
3 months ago
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- `90-thunderbolt-net-systemd.rules` tags `thunderbolt*` NICs so udev starts the
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enlist service automatically.
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These files live under `deploy/attempt1/common/` and are copied verbatim to the
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remote host’s `/etc/systemd/system` and `/etc/udev/rules.d`.
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## Validation checklist
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After running the deploy script on a host:
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- `systemctl status tb-bridge.service` should show an *active* oneshot unit.
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- `systemctl list-units 'tb-enlist@*'` should list one unit per detected Thunderbolt
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NIC, each *loaded* and *active*.
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- `ip -d link show thunderbridge` should display MTU 65520 and `state UP`.
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- `bridge link` should list your Thunderbolt interfaces as ports of `thunderbridge`
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once cables are connected.
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If you change the network definitions, re-run `./deploy_tb.sh <host>` to push the
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updates. The script re-applies permissions, reloads systemd, retriggers udev, and
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refreshes the interfaces.
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## Troubleshooting tips
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- *SSH unreachable*: Confirm management and Thunderbolt IPs in the helper functions
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are correct, and that firewalls allow SSH. The script prints which IP it tried.
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- *Bridge missing after reboot*: Ensure `tb-bridge.service` is enabled; run
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`systemctl enable --now tb-bridge.service` on the host.
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- *NICs not joining*: Check `journalctl -u tb-enlist@thunderbolt0` for logs and make
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sure the udev rule is present under `/etc/udev/rules.d`.
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Bogdan Timofte
authored
3 months ago
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- *Slow shutdown with NFS on thunderbridge*: Verify the host has the updated
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`tb-enlist@.service` with `Before=network.target`; otherwise `thunderbridge`
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can disappear before Proxmox unmounts NFS storages and shutdown waits on NFS
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Bogdan Timofte
authored
3 months ago
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timeouts. Full incident context is tracked in cluster issue `ISSUE-2026-002`.
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Bogdan Timofte
authored
3 months ago
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- *MTU mismatch complaints*: The service forces MTU 65520 on both sides; verify the
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connected devices also support it.
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## Extending beyond attempt1
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Prefer copying `deploy/attempt1` into a new versioned folder (for example,
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`attempt2`) when you experiment with alternate topologies or addresses. This keeps
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previous rollouts reproducible and eases diffing of changes.
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