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AWS EC2 Ubuntu Update HOSTNAME Using JSON USER_DATA
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#!/bin/bash | |
# Write to /usr/local/ec2/ec2-hostname.sh | |
# Execute chmod 755 ec2-hostname.sh | |
# Append /usr/local/ec2/ec2-hostname.sh to /etc/rc.local | |
# Referenced: http://ternarylabs.com/2010/09/15/automatically-configure-hostname-for-new-ec2-instances/ | |
USER_DATA=`/usr/bin/curl -s http://169.254.169.254/latest/user-data` | |
IPV4=`/usr/bin/curl -s http://169.254.169.254/latest/meta-data/public-ipv4` | |
echo "Metdata user data : $USER_DATA" | |
USER_DATA_HOST=`echo $USER_DATA | python -c 'import json,sys; obj=json.load(sys.stdin); print obj["host"];'` | |
USER_DATA_DOMAIN=`echo $USER_DATA | python -c 'import json,sys; obj=json.load(sys.stdin); print obj["domain"];'` | |
echo "Updating hostname to $USER_DATA_HOST.$USER_DATA_DOMAIN" | |
# Set the host name | |
hostname $USER_DATA_HOST.$USER_DATA_DOMAIN | |
echo $USER_DATA_HOST.$USER_DATA_DOMAIN > /etc/hostname | |
# Update host file | |
cat<<EOF > /etc/hosts | |
# This file is automatically genreated by ec2-hostname script | |
127.0.0.1 localhost | |
127.0.0.1 $USER_DATA_HOST.$USER_DATA_DOMAIN $USER_DATA_HOST | |
$IPV4 $USER_DATA_HOST.$USER_DATA_DOMAIN $USER_DATA_HOST | |
# The following lines are desirable for IPv6 capable hosts | |
::1 ip6-localhost ip6-loopback | |
fe00::0 ip6-localnet | |
ff00::0 ip6-mcastprefix | |
ff02::1 ip6-allnodes | |
ff02::2 ip6-allrouters | |
ff02::3 ip6-allhosts | |
EOF |
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{ | |
"host":"jenkins", | |
"domain":"ofunc.com" | |
} |
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