EC2 instance public key invalid fix

I happened to do the same thing that is listed at this web page:  http://dltj.org/article/ec2-fix-authorized_keys/

The steps are on the web page. Here are the command:
1. aws ec2 create-volume --snapshot-id snap-YourVolumesSnapshot --size 10 -- availability-zone az-asdf-1a
Note: Assumes you have a current snapshot: aws ec2 create-snapshot --volume-id vol-beforevolumewasbad

 2. aws ec2 stop-instances --instance-id i-YourInstanceId

3. aws ec2 detach-volume --volume-id vol-badvolume

4. aws ec2 attach-volume --volume-id vol-goodvolume --instance-id i- YourInstanceId --device /dev/sda1

5. aws ec2 start-instances --instance-id i-YourInstanceId

Boot strapping with user data and CloudFormation

For simple bootstrapping, user data text/scripts may be adequate.  Keep in mind the limit on size is 16K for user data.

s3cmd is often used to load the bootstrap scripts for S3. More on this can be found here:

http://s3tools.org/s3cmd

https://github.com/s3tools/s3cmd

A very good document on using user data, CloudFormation, Chef, Puppet and other tools to bootstrap EC2 instances can be found here:

https://s3.amazonaws.com/cloudformation-examples/BoostrappingApplicationsWithAWSCloudFormation.pdf