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Forked from jfro/update-dns.sh
Created May 8, 2012 00:24
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Linode dynamic DNS updating script
#!/bin/sh
# modified by jfro from http://www.cnysupport.com/index.php/linode-dynamic-dns-ddns-update-script
# Uses curl to be compatible with machines that don't have wget by default
LINODE_API_KEY=licensekey
DOMAIN_ID=domainid
RESOURCE_ID=resourceid
WAN_IP=`curl -s http://example.com/whatsmyip.php`
if [ -f $HOME/.wan_ip.txt ]; then
OLD_WAN_IP=`cat $HOME/.wan_ip.txt`
else
echo "No file, need IP"
OLD_WAN_IP=""
fi
if [ "$WAN_IP" = "$OLD_WAN_IP" ]; then
echo "IP Unchanged"
else
echo $WAN_IP > $HOME/.wan_ip.txt
echo "Updating DNS to $WAN_IP"
curl -s https://api.linode.com/?api_key="$LINODE_API_KEY"\&api_action=domain.resource.update\&DomainID="$DOMAIN_ID"\&ResourceID="$RESOURCE_ID"\&Target="$WAN_IP" > /dev/null
fi
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