45 lines
1.5 KiB
Bash
45 lines
1.5 KiB
Bash
#!/bin/bash
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# Read-only DNS consistency checker for Proxmox VMs.
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# Checks that every running VM's name resolves to the IP it's actually using,
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# and that reverse DNS (PTR) matches the VM name. Mismatches are reported as bugs.
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set -u
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echo "===== VM DNS CONSISTENCY CHECK: $(hostname -s) $(date -u +%FT%TZ) ====="
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echo
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echo "##### Running VMs with IPs (via guest-agent or ARP) #####"
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for vmid in $(qm list 2>/dev/null | awk 'NR>1 && $4=="running" {print $1}'); do
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name=$(qm config "$vmid" 2>/dev/null | awk '/^name:/{print $2}')
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# Get the VM's net0 config to determine the bridge
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net0=$(qm config "$vmid" 2>/dev/null | awk '/^net0:/{print $0}')
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echo ""
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echo "--- VMID $vmid: $name ---"
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echo " net0: $(echo "$net0" | sed 's/net0: //')"
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# Try to get IP via guest-agent
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if qm config "$vmid" 2>/dev/null | grep -q 'agent:.*enabled=1\|^agent: 1'; then
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guest_ips=$(qm guest cmd "$vmid" network-get-interfaces 2>/dev/null)
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if [ -n "$guest_ips" ]; then
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echo " guest-agent IPs:"
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echo "$guest_ips" | python3 -c "
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import sys, json
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try:
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data = json.load(sys.stdin)
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for iface in data:
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name = iface.get('name','?')
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for addr in iface.get('ip-addresses',[]):
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ip = addr.get('ip-address','')
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typ = addr.get('ip-address-type','')
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if typ == 'ipv4' and not ip.startswith('127.'):
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print(f' {name}: {ip}')
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except: pass
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" 2>/dev/null
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else
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echo " guest-agent: no response"
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fi
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else
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echo " guest-agent: not enabled"
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fi
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done
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echo
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echo "===== END $(hostname -s) ====="
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