Update Route53 script

gistfile1.sh

# Adapted from: http://blog.domenech.org/2012/11/automatically-manage-your-aws-ec2.html
# External IPs are not useful internally in AWS. Change to CNAME with public DNS. This ensures you don't pay for extra bandwidth as if will resolve to an internal IP when inside AWS and an external IP when outside in the real world

#!/bin/bash

logger start-up-name.sh Started

#More environment variables than we need but... we always do that
export AWS_CREDENTIAL_FILE=/opt/aws/apitools/mon/credential-file-path.template
export AWS_CLOUDWATCH_HOME=/opt/aws/apitools/mon
export AWS_IAM_HOME=/opt/aws/apitools/iam
export AWS_PATH=/opt/aws
export AWS_AUTO_SCALING_HOME=/opt/aws/apitools/as
export AWS_ELB_HOME=/opt/aws/apitools/elb
export AWS_RDS_HOME=/opt/aws/apitools/rds
export EC2_AMITOOL_HOME=/usr/local/aws/ec2/
export EC2_HOME=/usr/local/aws/ec2/
export JAVA_HOME=/usr/lib/jvm/default-java/jre/
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/aws/ec2/bin:/root/bin

# *** Configure these values with your settings ***
#API Credentials
AWSSECRETS="/root/bin/.aws-secrets"
KEYNAME="<%= @key_name %>"
#Hosted Zone ID obtained from Route53 Console once the zone is created
HOSTEDZONEID="<%= @zone_name %>"
#Domain name configured in Route53 and used to store our server names
DOMAIN="<%= @domain %>"
# *** Configuration ends here ***

#Let's get the Credentials that EC2 API needs from .aws-secrets dnscurl.pl file
ACCESSKEY=`cat $AWSSECRETS | grep id | cut -d\' -f2`
SECRETKEY=`cat $AWSSECRETS | grep key | cut -d\' -f2`

#InstanceID Obtained from MetaData
INSTANCEID=`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id`

#Public Instance IP obtained from MetaData
PUBLICIP=`wget -q -O - http://169.254.169.254/latest/meta-data/public-ipv4`

#Get Public DNS
PUBLICDNS=`wget -q -O - http://169.254.169.254/latest/meta-data/public-hostname`

#CNAME currently configured in the DNS server (if exists)
CURRENTDNSCNAME=`dig $INSTANCEID"."$DOMAIN | grep -i CNAME | awk '{print $5}'`

#Instance Name obtained from the Instance Custom Tag NAME
WGET="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id`"
INSTANCENAME=`ec2-describe-instances -O $ACCESSKEY -W $SECRETKEY $WGET --show-empty-fields | grep TAG | grep Name | awk '{ print $5 }'`

echo $INSTANCEID $PUBLICIP $CURRENTDNSCNAME $INSTANCENAME
logger $INSTANCEID $PUBLICIP $CURRENTDNSCNAME $INSTANCENAME

#Set the new Hostname using the Instance Tag OR the Instance ID
if [ -n "$INSTANCENAME" ]; then
hostname $INSTANCENAME
logger Hostname from InstanceName set to $INSTANCENAME
else
hostname $INSTANCEID
logger Hostname from InstanceID set to $INSTANCEID
fi

#dnscurl.pl Delete Current InstanceID Public IP CNAME Record to allow Later Update
COMMAND="<?xml version=\"1.0\" encoding=\"UTF-8\"?><ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2012-02-29/\"><ChangeBatch><Changes><Change><Action>"DELETE"</Action><ResourceRecordSet><Name>"$INSTANCEID"."$DOMAIN".</Name><Type>CNAME</Type><TTL>300</TTL><ResourceRecords><ResourceRecord><Value>"$CURRENTDNSCNAME"</Value></ResourceRecord></ResourceRecords></ResourceRecordSet></Change></Changes></ChangeBatch></ChangeResourceRecordSetsRequest>"

/root/bin/dnscurl.pl --keyfile $AWSSECRETS --keyname $KEYNAME -- -v -H "Content-Type: text/xml; charset=UTF-8" -X POST https://route53.amazonaws.com/2012-02-29/hostedzone/$HOSTEDZONEID/rrset -d "$COMMAND"

#dnscurl.pl Create InstanceID Public IP CNAME Record
COMMAND="<?xml version=\"1.0\" encoding=\"UTF-8\"?><ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2012-02-29/\"><ChangeBatch><Changes><Change><Action>"CREATE"</Action><ResourceRecordSet><Name>"$INSTANCEID"."$DOMAIN".</Name><Type>CNAME</Type><TTL>300</TTL><ResourceRecords><ResourceRecord><Value>"$PUBLICDNS"</Value></ResourceRecord></ResourceRecords></ResourceRecordSet></Change></Changes></ChangeBatch></ChangeResourceRecordSetsRequest>"

/root/bin/dnscurl.pl --keyfile $AWSSECRETS --keyname $KEYNAME -- -v -H "Content-Type: text/xml; charset=UTF-8" -X POST https://route53.amazonaws.com/2012-02-29/hostedzone/$HOSTEDZONEID/rrset -d "$COMMAND"

logger Entry $INSTANCEID.$DOMAIN sent to Route53

#Create DNS A record for Instance Name (if exists)
if [ -n "$INSTANCENAME" ]; then

#dnscurl.pl Delete Current Instance Name Public IP CNAME Record to allow Later Update
COMMAND="<?xml version=\"1.0\" encoding=\"UTF-8\"?><ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2012-02-29/\"><ChangeBatch><Changes><Change><Action>"DELETE"</Action><ResourceRecordSet><Name>"$INSTANCENAME"."$DOMAIN".</Name><Type>CNAME</Type><TTL>300</TTL><ResourceRecords><ResourceRecord><Value>"$CURRENTDNSCNAME"</Value></ResourceRecord></ResourceRecords></ResourceRecordSet></Change></Changes></ChangeBatch></ChangeResourceRecordSetsRequest>"

/root/bin/dnscurl.pl --keyfile $AWSSECRETS --keyname $KEYNAME -- -v -H "Content-Type: text/xml; charset=UTF-8" -X POST https://route53.amazonaws.com/2012-02-29/hostedzone/$HOSTEDZONEID/rrset -d "$COMMAND"

#dnscurl.pl Create Instance Name Public IP A Record
COMMAND="<?xml version=\"1.0\" encoding=\"UTF-8\"?><ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2012-02-29/\"><ChangeBatch><Changes><Change><Action>"CREATE"</Action><ResourceRecordSet><Name>"$INSTANCENAME"."$DOMAIN".</Name><Type>CNAME</Type><TTL>300</TTL><ResourceRecords><ResourceRecord><Value>"$PUBLICDNS"</Value></ResourceRecord></ResourceRecords></ResourceRecordSet></Change></Changes></ChangeBatch></ChangeResourceRecordSetsRequest>"

/root/bin/dnscurl.pl --keyfile $AWSSECRETS --keyname $KEYNAME -- -v -H "Content-Type: text/xml; charset=UTF-8" -X POST https://route53.amazonaws.com/2012-02-29/hostedzone/$HOSTEDZONEID/rrset -d "$COMMAND"

logger Entry $INSTANCENAME.$DOMAIN sent to Route53
fi

logger start-up-names.sh Ended