Created
February 7, 2019 18:12
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AWS EC2: set a node's hostname to it's tagged name
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#!/bin/bash | |
set -ex | |
# Sanity check | |
hostname="$(hostname --fqdn)" | |
if [[ "$hostname" != ip-*.internal ]]; then | |
echo hostname already updated | |
exit 0 | |
fi | |
# Install requirements | |
apt update | |
apt install -y --no-install-recommends jq python3-pip python3-wheel | |
pip3 install awscli | |
# Configure awscli | |
export AWS_DEFAULT_REGION="$(hostname --fqdn | cut -d. -f2)" | |
# Get tagged hostname | |
current_hostname="$(hostname --fqdn)" | |
instanceid="$(aws ec2 describe-instances --filter Name=private-dns-name,Values="$current_hostname" | jq -r .Reservations[0].Instances[0].InstanceId)" | |
new_hostname="$(aws ec2 describe-tags --filters Name=resource-id,Values="$instanceid" | jq -r '.Tags[] | select(.Key == "Name") | .Value')" | |
if [ -z "$new_hostname" ]; then | |
echo new hostname not found | |
exit 1 | |
fi | |
# Update hostname | |
hostname "$new_hostname" | |
echo "$new_hostname" >/etc/hostname |
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