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2026-07-18ansibleproxmoxlxcsshautomationidempotencetroubleshooting

Seven Machines, One Command

This weekend I was away from my homelab for two days. All I left behind was one Windows machine that could reach the lab's management network, which gave me the Proxmox web GUI and a console. No physical access, no keyboard on any server.

The Switch Was the Firewall

My CI runner could not SSH to my production host. Same VLAN, both up, both healthy, and every packet between them disappeared. No firewall log. No error. No RST. Just silence.

The Ghost Was a Cable

I built a backup vault for my lab: a small Rocky Linux container on the most restricted VLAN I have, the database zone. Fresh container, correct IP, correct gateway. First test: