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Route 53 update script.
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| #!/bin/bash | |
| # Copied from http://willwarren.com/2014/07/03/roll-dynamic-dns-service-using-amazon-route53/ | |
| # Hosted Zone ID e.g. BJBK35SKMM9OE | |
| ZONEID="enter zone id here" | |
| # The CNAME you want to update e.g. hello.example.com | |
| RECORDSET="enter cname here" | |
| # More advanced options below | |
| # The Time-To-Live of this recordset | |
| TTL=300 | |
| # Change this if you want | |
| COMMENT="Auto updating @ `date`" | |
| # Change to AAAA if using an IPv6 address | |
| TYPE="A" | |
| # Get the external IP address | |
| IP=`curl -sSk https://wtfismyip.com/text` | |
| function valid_ip() | |
| { | |
| local ip=$1 | |
| local stat=1 | |
| if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then | |
| OIFS=$IFS | |
| IFS='.' | |
| ip=($ip) | |
| IFS=$OIFS | |
| [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \ | |
| && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]] | |
| stat=$? | |
| fi | |
| return $stat | |
| } | |
| # Get current dir (stolen from http://stackoverflow.com/a/246128/920350) | |
| DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" | |
| LOGFILE="$DIR/update-route53.log" | |
| IPFILE="$DIR/update-route53.ip" | |
| if ! valid_ip $IP; then | |
| echo "Invalid IP address: $IP" >> "$LOGFILE" | |
| exit 1 | |
| fi | |
| # Check if the IP has changed | |
| if [ ! -f "$IPFILE" ] | |
| then | |
| touch "$IPFILE" | |
| fi | |
| if grep -Fxq "$IP" "$IPFILE"; then | |
| # code if found | |
| echo "IP is still $IP. Exiting" >> "$LOGFILE" | |
| exit 0 | |
| else | |
| echo "IP has changed to $IP" >> "$LOGFILE" | |
| # Fill a temp file with valid JSON | |
| TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX) | |
| cat > ${TMPFILE} << EOF | |
| { | |
| "Comment":"$COMMENT", | |
| "Changes":[ | |
| { | |
| "Action":"UPSERT", | |
| "ResourceRecordSet":{ | |
| "ResourceRecords":[ | |
| { | |
| "Value":"$IP" | |
| } | |
| ], | |
| "Name":"$RECORDSET", | |
| "Type":"$TYPE", | |
| "TTL":$TTL | |
| } | |
| } | |
| ] | |
| } | |
| EOF | |
| # Update the Hosted Zone record | |
| aws route53 change-resource-record-sets \ | |
| --hosted-zone-id $ZONEID \ | |
| --change-batch file://"$TMPFILE" >> "$LOGFILE" | |
| echo "" >> "$LOGFILE" | |
| # Clean up | |
| rm $TMPFILE | |
| fi | |
| # All Done - cache the IP address for next time | |
| echo "$IP" > "$IPFILE" |
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