EGL AWS Autoscaling Update AMI Utility

This utility updates autoscaling Launch Configurations and associated autoscaling groups with a new AMI.

This utility provides Autoscaling AMI update functionality unavailable in the AWS console or directly via the AWS CLI API.

This utility can:

• Create a new clone Launch Configuration for every Launch Configuration using the old, target AMI
• Update all clone Launch Configurations to use the new AMI
• Update all associated Autoscaling Groups to use the new Launch Configuration with the new AMI
• Retain X prior Launch Configuration versions
• Append text to the Launch Configuration name
• Enable or disable EC2 instance detailed monitoring
• Add a security group to all Launch Configurations
• Create a JSON mapping file for all related components, e.g. AMIs, Launch Configurations and Autoscaling Group(s)

This utility produces a summary report listing:

• The AWS account and alias
• The old AMI ID and name
• The new AMI ID and name
• The number of prior launch configuration versions to retain
• The number of launch configurations updated
• The number of autoscaling groups updated
• Errors
• List of prior version Launch Configurations deleted
• List of each set of new and old AMIs, new and old Launch Configurations and associated Autoscaling Groups

Getting Started

1. Instantiate a local or EC2 Linux instance
2. Install or update the AWS CLI utilities
   • The AWS CLI utilities are pre-installed on AWS EC2 Linux instances
   • To update on an AWS EC2 instance: $ sudo pip install --upgrade awscli
3. Create an AWS CLI named profile that includes the required IAM permissions
   • See the "Prerequisites" section for the required IAM permissions
   • To create an AWS CLI named profile: $ aws configure --profile MyProfileName
   • AWS CLI named profile documentation is here: Named Profiles
4. Install the bash shell
   • The bash shell is included in most distributions and is pre-installed on AWS EC2 Linux instances
5. Install jq
   • To install jq on AWS EC2: $ sudo yum install jq -y
6. Download this utility script or create a local copy and run it on the local or EC2 Linux instance
   • Example: $ bash ./autoscaling-update-ami.sh -p AWS_CLI_profile -n new_AMI_ID_or_name -t old_target_AMI_ID_or_name -a append-text

Prerequisites

• bash - Linux shell
• jq - JSON wrangler
• AWS CLI - command line utilities (pre-installed on AWS AMIs)
• AWS CLI profile with IAM permissions for the following AWS CLI commands:
  • aws autoscaling create-launch-configuration
  • aws autoscaling delete-launch-configuration
  • aws autoscaling describe-auto-scaling-groups
  • aws autoscaling describe-launch-configurations
  • aws autoscaling update-auto-scaling-group
  • aws ec2 describe-images (used to test AMI)
  • aws iam list-account-aliases (used to pull AWS account alias)
  • aws sts get-caller-identity (used to pull AWS acount)

Deployment

To execute the utility:

• Example: $ bash ./autoscaling-update-ami.sh -p AWS_CLI_profile -n new_AMI_ID_or_name -t old_target_AMI_ID_or_name -a append-text

To directly execute the utility:

1. Set the execute flag: $ chmod +x autoscaling-update-ami.sh
2. Execute the utility
   • Example: $ ./autoscaling-update-ami.sh -p AWS_CLI_profile -n new_AMI_ID_or_name -t old_target_AMI_ID_or_name -a append-text

Output

• Summary report
• JSON mapping file for all related components, e.g. AMIs, Launch Configurations and Autoscaling Group(s)
• Debug log (execute with the -g y parameter)
  • Example: $ bash ./autoscaling-update-ami.sh -p AWS_CLI_profile -n new_AMI_ID_or_name -t old_target_AMI_ID_or_name -a append-text -g y
• Console verbose mode (execute with the -b y parameter)
  • Example: $ bash ./autoscaling-update-ami.sh -p AWS_CLI_profile -n new_AMI_ID_or_name -t old_target_AMI_ID_or_name -a append-text -b y

Contributing

Please read CONTRIBUTING.md for the process for submitting pull requests to us.

Versioning

We use SemVer for versioning.

Authors

• Douglas Hackney - dhackney

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Acknowledgments

• Progress bar
• Dynamic headers fprint
• Menu
• Countless other jq and bash/shell man pages, Q&A, posts, examples, tutorials, etc. from various sources