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fix(console): switch conman from ser2net-telnet to direct serial access

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The ser2net layer between conman and the serial devices was causing
stair-stepping in terminal output. conman's dev="host:port" uses telnet
protocol, but ser2net's accepter was raw TCP (no telnet mode). The telnet
NVT state machine in conman was stripping bare CR characters from device
output — particularly from Dell switches that use old-style \n\r (LF+CR)
line endings instead of standard \r\n. In telnet, a bare \r not followed
by \n or NUL is non-compliant and gets dropped, leaving bare \n that
causes stair-stepping in the raw-mode terminal.

Fix: conman now opens serial devices directly via the stable udev
symlinks (/dev/consoles/<name>) with seropts, eliminating the telnet
layer entirely. ser2net is stopped and disabled but remains installed
for emergency TCP access (documented workflow: stop conmand, start
ser2net, use telnet, then reverse).

Architecture change:
  Before: device → serial → ser2net (raw TCP) → conman (telnet NVT) → terminal
  After:  device → serial → conman (direct) → terminal

Verified: 7/7 serial devices held by conmand, 7/7 log files capturing,
all \r bytes preserved in terminal output (confirmed via PTY capture).

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Assisted-by: Crush:glm-5.2
This commit is contained in:
mrcharles
2026-07-29 18:29:31 -05:00
parent 80693e4f8e
commit fa0c77fb58
6 changed files with 98 additions and 85 deletions
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docs/docmap.md
+1 -1
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@@ -46,7 +46,7 @@ Server provisioning, security hardening, DNS/NTP configuration.
|----------|-------------|---------------|
| [`../netinfra/dhcp-migration.md`](../netinfra/dhcp-migration.md) | DHCP migration: pfv-netboot → netinfra-01/02 (ISC failover-peer, COMPLETE) | 2026-07-29 |
| [`../powerman/README.md`](../powerman/README.md) | Cyclades PM10i PDU management via powerman on pfv-tsys1 | 2026-07-28 |
| [`../console/README.md`](../console/README.md) | Serial console management (ser2net + conman) for 7 network switches on pfv-tsys4 | 2026-07-28 |
| [`../console/README.md`](../console/README.md) | Serial console management (conman direct-serial) for 7 network switches on pfv-tsys4 | 2026-07-29 |
| [`../k8s/README.md`](../k8s/README.md) | k3s cluster setup scripts: wipe, bootstrap, taint, verify (3-node HA over Tailscale) | 2026-07-28 |
| [`../dns-cluster-setup/README.md`](../dns-cluster-setup/README.md) | Technitium DNS cluster setup: export, deploy, cluster, verify | 2026-07-28 |
| [`../tests/README.md`](../tests/README.md) | Test suite documentation: unit, security, validation tests | 2026-07-28 |