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db97382758
./sbin/update-dns.sh may be called at regular intervals (one hour or so) via crontab. It will automatically detect: - its local host name (*.lan.dougal.aaltronav.eu); and - which IP has internet access, if any. Armed with that information and with the dynamic DNS API password stored in DYNDNS_PASSWD in ~/.dougalrc, it will update the relevant DNS record. For this to work, the first `lan.dougal` hostname in the Nginx configuration must be the one that is set up for dynamic update. Other `lan.dougal` hostnames should be CNAME records pointing to the first one.
20 lines
617 B
Bash
Executable File
20 lines
617 B
Bash
Executable File
#!/bin/bash
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# Find the interface used for the default route (e.g., to reach 8.8.8.8)
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INTERFACE=$(ip route get 8.8.8.8 | awk '{for(i=1;i<=NF;i++) if ($i=="dev") {print $(i+1); exit}}')
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if [ -z "$INTERFACE" ] || [ "$INTERFACE" = "lo" ]; then
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echo "No valid default route found." >/dev/stderr
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exit 1
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fi
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# Extract the primary IPv4 address from the interface (excluding loopback)
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IP=$(ip -4 addr show dev "$INTERFACE" scope global | grep -oP '(?<=inet\s)\d{1,3}(\.\d{1,3}){3}(?=/)' | head -n1)
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if [ -z "$IP" ]; then
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echo "No global IPv4 address found on $INTERFACE." >/dev/stderr
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exit 1
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fi
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echo "$IP"
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