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CloudFormation Helpers

Some scripts to help you manage AWS CloudFormation stacks

asg-attic.py

A cost-saving script for full-stack deployments. This script mothballs all AutoScaling groups in old stacks by setting the min/max/desired to 0. This is so you can keep old stacks around for "a while" in case a roll-back is required.

$ ./asg-attic.py -h
usage: asg-attic.py [-h] [-l] [-m MOTHBALL] [-r REOPEN REOPEN]

optional arguments:
  -h, --help            show this help message and exit
  -l, --list            list stacks, autoscaling groups and values
  -m MOTHBALL, --mothball MOTHBALL
                        reduce the instances for all autoscaling group(s) in a
                        stack to zero
  -r REOPEN REOPEN, --reopen REOPEN REOPEN
                        increase the instances for all autoscaling group(s) in
                        a stack to min:max:desired

To use it, you'll need to configure your boto credentials.

mkcfnuserdata.py

This script will help JSON format a script so that it can be embedded as in the UserData property for a AWS::EC2::Instance or AWS::AutoScaling::LaunchConfiguration resources. It does the following things:

  • removes blank lines
  • removes comment lines that start with '#' but keeps the shebang line
  • does ghetto templating with the CFNREF_ prefix: turn CFNREF_CustomParameter into ", { "Ref": "CustomParameter" }, "

Once you do this, you can copy/paste the results into your template.

ToDo:

  • better templating for Ref and possibly Fn::GetAtt
  • don't copy/paste results into a template, take a template as an argument and use templating
  • include more cloud-init features, formats

License

Copyright 2013 Corsis http://www.corsis.com/

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.