Sanitized mirror from private repository - 2026-03-21 05:42:25 UTC

hosts/vms/vishdebian-vm/README.md

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+# vishdebian
+
+Debian 13 VM running on Calypso (Synology DS723+).
+
+**Hostname**: vishdebian
+**LAN IP**: 192.168.0.81 (DHCP)
+**Tailscale IP**: 100.64.0.2
+**SSH**: `ssh vishdebian` (via Tailscale — see `~/.ssh/config`)
+**SSH user**: vish (passwordless sudo)
+
+---
+
+## Hardware (Virtual Machine)
+
+| Property | Value |
+|----------|-------|
+| **Hypervisor** | Synology Virtual Machine Manager (VMM) on Calypso |
+| **Host** | Calypso — Synology DS723+ |
+| **OS** | Debian GNU/Linux 13 (Trixie) |
+| **Kernel** | 6.12.57+deb13-amd64 |
+| **Architecture** | x86_64 |
+| **vCPU** | 2 cores (AMD Ryzen Embedded R1600, host passthrough) |
+| **RAM** | 16 GB |
+| **Disk** | 1 TB (virtual disk), 97 GB root partition (`/dev/sda1`) |
+| **Network** | `ens3`, bridged to Calypso LAN |
+
+---
+
+## Network Configuration
+
+- **LAN IP**: `192.168.0.81/24` (DHCP from home router)
+- **Tailscale IP**: `100.64.0.2` (Headscale node 20)
+- **Default gateway**: `192.168.0.1`
+
+### Tailscale / Headscale
+
+Joined to Headscale at `headscale.vish.gg:8443`. Accepts all subnet routes (`--accept-routes`).
+
+**Known routing quirk**: Calypso advertises `192.168.0.0/24` as a subnet route via Headscale. This causes Tailscale to install that route in table 52 on this VM, which breaks inbound LAN connectivity (replies go via `tailscale0` instead of `ens3`). Fixed with a persistent ip rule:
+
+```bash
+# /etc/network/if-up.d/99-lan-routing-fix
+ip rule add to 192.168.0.0/24 priority 5200 lookup main 2>/dev/null || true
+```
+
+This rule takes priority 5200, beating Tailscale's table 52 rule at 5270.
+
+---
+
+## Services
+
+No persistent Docker stacks deployed yet.
+
+Docker is installed (v29.1.1) and ready for use.
+
+---
+
+## Quick Access
+
+```bash
+# SSH
+ssh vishdebian
+
+# Check running containers
+ssh vishdebian "docker ps"
+
+# System resources
+ssh vishdebian "free -h && df -h /"
+```
+
+---
+
+*Last Updated*: 2026-03-10
+*Host*: Calypso (Synology DS723+) via Synology VMM