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brb/ec2-update-etchosts.sh

Last active August 29, 2015 14:08
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poor man's Elastic IP
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ec2-update-etchosts.sh
#!/bin/bash
# Update /etc/hosts with public non-elastic IPs of EC2 instances.
# Assumes that a name is set for each instance and there is only one value inside tags section.
PREFIX="aws_"
FILTER=".Reservations[].Instances[] |
select(.PublicIpAddress != null) |
.PublicIpAddress + \" $PREFIX\" + .Tags[].Value"
sudo sed -i "/$PREFIX/d" /etc/hosts
aws ec2 describe-instances | jq -r "$FILTER" | sudo tee -a /etc/hosts
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