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AWS user-data to register with a Chef server. We are assuming that Chef is already installed during a previous AMI building phase.
apt-get update
apt-get -y upgrade
# Get the validation.pem from S3
# This can only be done if the IAM profile the instance
# was launched with has access to the $S3_BUCKET.
s3cmd get s3://$S3_BUCKET/validation.pem /etc/chef/validation.pem
chmod 600 /etc/chef/validation.pem
# Write first-boot.json and client.rb
s3cmd get s3://$S3_BUCKET/first-boot/$ROLE.json /etc/chef/first-boot.json
s3cmd get s3://$S3_BUCKET/client.rb /etc/chef/client.rb
# Bootstrap Chef
chef-client -j /etc/chef/first-boot.json
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