Created
March 1, 2012 19:17
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A knife exec script to change Chef node's name.
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#!./bin/knife exec | |
# A knife exec script to change chef node's name, preserving all the attributes. | |
# | |
# Usage: knife exec rename-node.rb old-name new-name | |
# | |
# Script retrieves the Node object, changes its 'name' attribute, | |
# creates new Node object with updated name and rest of attributes | |
# untouched. Then it deletes old Node and Client objects from | |
# database, and logs into the server to update it: | |
# - copy validation.pem from the local .chef directory | |
# - remove client.pem | |
# - comment out node_name from client.rb | |
# - delete "name":"[^"]*" entry from attributes.json if file exists | |
# - delete attributes.json if empty | |
# - run chef-client -N new_id to re-register client | |
# | |
# Script makes a few assumptions that may be different in your setup: | |
# - that you keep validation.pem locally in .chef/ | |
# - that you generate client.rb including client_name during chef-client run | |
# - that you may have attributes.json file and it is not pretty-printed (no extra spaces) | |
# - that chef-client will run with or without attributes.json file | |
# | |
# To sum up, you will probably want to review the script and adapt | |
# parts of it to match your setup, especially shell script part near | |
# the bottom (here-doc for ssh.exec! invocation). | |
# | |
# Based on: | |
# - http://tech.superhappykittymeow.com/?p=292 | |
# - http://help.opscode.com/discussions/questions/130-rename-a-node | |
# - http://lists.opscode.com/sympa/arc/chef/2011-05/msg00196.html | |
abort("usage: ./bin/knife exec #{ARGV[1]} from_id to_id") unless ARGV[3] | |
require 'net/ssh' | |
require 'net/scp' | |
from_id = ARGV[2] | |
to_id = ARGV[3] | |
puts "Loading node #{from_id}..." | |
orig_node = Chef::Node.load(from_id) | |
node_data = JSON::parse(orig_node.to_json, :create_id => nil) | |
puts "Changing name attribute to #{to_id}..." | |
node_data['name'] = to_id | |
node_data.values. | |
select { |v| v.is_a?(Hash) and v['name'] }. | |
each { |v| v['name'] = to_id } | |
puts "Saving modified node..." | |
# without :create_id => nil JSON::parse will create an actual instance | |
new_node = JSON::parse(JSON::dump(node_data)) | |
new_node.save | |
unless ENV['KEEP_IT_SAFE'] | |
puts "Deleting node #{from_id}..." | |
orig_node.destroy | |
puts "Deleting client #{from_id}..." | |
Chef::ApiClient.load(from_id).destroy | |
end | |
puts "Logging into node..." | |
Net::SSH.start(new_node.ec2.public_hostname, Chef::Config[:knife][:ssh_user]) do |ssh| | |
puts "Uploading validation.pem..." | |
ssh.scp.upload!(".chef/validation.pem", "/tmp/validation.pem") | |
puts "Running update script..." | |
ssh.exec! <<EOF do |ch, stream, data| | |
set -e -x | |
cd /etc/chef | |
sudo mv -v /tmp/validation.pem . | |
sudo rm -v client.pem | |
sudo sed -i~rename '/node_name/s/^/# /' client.rb | |
if [ -f attributes.json ] ; then | |
sudo sed -i~rename 's/"name":"[^"]*",*//' attributes.json | |
[ `sudo cat attributes.json` = '{}' ] && sudo rm -v attributes.json | |
[ -f attributes.json ] && sudo cat attributes.json | |
fi | |
sudo chef-client -N #{to_id} -l warn | |
EOF | |
if stream == :stderr | |
STDERR.write data | |
STDERR.flush | |
else | |
STDOUT.write data | |
STDOUT.flush | |
end | |
end | |
end | |
puts "Done!" | |
exit 0 | |
# http://wiki.opscode.com/display/chef/Knife+Exec#KnifeExec-PassingArgumentstoKnifeScripts | |
### Copyright (C) 2012 Maciej Pasternacki <maciej@pasternacki.net> | |
### | |
### DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
### Version 2, December 2004 | |
### | |
### Copyright (C) 2004 Sam Hocevar <sam@hocevar.net> | |
### | |
### Everyone is permitted to copy and distribute verbatim or modified | |
### copies of this license document, and changing it is allowed as long | |
### as the name is changed. | |
### | |
### DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
### | |
### 0. You just DO WHAT THE FUCK YOU WANT TO. |
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