gistfile1.sh

#!/bin/bash

SLD="<%= @domain %>"
AWSID="<%= @awsid %>"
AWSKEY="<%= @awskey %>"
SHORTHOST=`echo <%= node[:this_server] %> | sed 's/_/-/g' | sed "s/.${SLD}//"`
HOSTNAME="${SHORTHOST}.${SLD}"

cat > ~/.aws-secrets << EOF
%awsSecretAccessKeys = (
   "aws" => {
      id => "$AWSID",
      key => "$AWSKEY",
   },
);
EOF

chmod 600 ~/.aws-secrets

sudo rm -f /tmp/lastdns.log
echo "*** FINDING PASTHOST AND CURHOST" > /tmp/lastdns.log

PASTHOST=`dig ${HOSTNAME} | grep CNAME | awk '{print $NF}' | rev | cut -b 2-| rev 2>> /tmp/lastdns.log`
CURHOST=`curl -s http://169.254.169.254/latest/meta-data/public-hostname 2>> /tmp/lastdns.log`

echo "HOSTNAME: $HOSTNAME" >> /tmp/lastdns.log
echo "PASTHOST: $PASTHOST" >> /tmp/lastdns.log
echo "CURHOST: $CURHOST" >> /tmp/lastdns.log

cat > /tmp/r53create.xml << EOF
<?xml version="1.0" encoding="UTF-8"?>
<ChangeResourceRecordSetsRequest xmlns="https://route53.amazonaws.com/doc/2011-05-05/">
   <ChangeBatch>
      <Comment>
      Update record
      </Comment>
      <Changes>
          <Change>
            <Action>CREATE</Action>
            <ResourceRecordSet>
               <Name>$HOSTNAME</Name>
               <Type>CNAME</Type>
               <TTL>300</TTL>
               <ResourceRecords>
                  <ResourceRecord>
                     <Value>$CURHOST</Value>
                  </ResourceRecord>
               </ResourceRecords>
            </ResourceRecordSet>
         </Change>
      </Changes>
   </ChangeBatch>
</ChangeResourceRecordSetsRequest>
EOF

cat > /tmp/r53update.xml << EOF
<?xml version="1.0" encoding="UTF-8"?>
<ChangeResourceRecordSetsRequest xmlns="https://route53.amazonaws.com/doc/2011-05-05/">
   <ChangeBatch>
      <Comment>
      Update record
      </Comment>
      <Changes>
          <Change>
            <Action>DELETE</Action>
            <ResourceRecordSet>
               <Name>$HOSTNAME</Name>
               <Type>CNAME</Type>
               <TTL>300</TTL>
               <ResourceRecords>
                  <ResourceRecord>
                     <Value>$PASTHOST</Value>
                  </ResourceRecord>
               </ResourceRecords>
            </ResourceRecordSet>
          </Change>
          <Change>
            <Action>CREATE</Action>
            <ResourceRecordSet>
               <Name>$HOSTNAME</Name>
               <Type>CNAME</Type>
               <TTL>300</TTL>
               <ResourceRecords>
                  <ResourceRecord>
                     <Value>$CURHOST</Value>
                  </ResourceRecord>
               </ResourceRecords>
            </ResourceRecordSet>
         </Change>
      </Changes>
   </ChangeBatch>
</ChangeResourceRecordSetsRequest>
EOF

if [ ! -f /tmp/dnscurl.pl ]; then
  echo "*** dnscurl.pl NOT FOUND, DOWNLOADING" >> /tmp/lastdns.log
  wget -q http://awsmedia.s3.amazonaws.com/catalog/attachments/dnscurl.pl -O /tmp/dnscurl.pl 2>> /tmp/lastdns.log
fi

chmod +x /tmp/dnscurl.pl

echo "*** ATTEMPTING CREATE" >> /tmp/lastdns.log
/tmp/dnscurl.pl --keyname aws -- -s -H "Content-Type: text/xml; charset=UTF-8" -X POST --upload-file /tmp/r53create.xml https://route53.amazonaws.com/2011-05-05/hostedzone/<%= @zoneid %>/rrset &>> /tmp/lastdns.log
echo "\n*** ATTEMPTING DELETE/CREATE" >> /tmp/lastdns.log
/tmp/dnscurl.pl --keyname aws -- -s -H "Content-Type: text/xml; charset=UTF-8" -X POST --upload-file /tmp/r53update.xml https://route53.amazonaws.com/2011-05-05/hostedzone/<%= @zoneid %>/rrset &>> /tmp/lastdns.log

unlink /tmp/r53create.xml
unlink /tmp/r53update.xml
unlink ~/.aws-secrets