AWS Incident Manager Slack Notifier

This is a simple Slack notifier, which looks who's on-call this week and notifies them on Slack. It's designed to be run as a scheduled Lambda function.

How it works

1. The Lambda function is triggered by a CloudWatch Event Rule Weekly every Monday
2. The function looks up the current week's on-call person in AWS Systems Manager Parameter Store
3. The function sends a message to the Slack channel of your choice
4. The function changes the on-call person before to the next person in the list

Getting started

1. Configure environment variables

• AWS_REGION: The AWS region where the Lambda function is deployed
• AWS_ACCESS_KEY_ID: The AWS access key ID for Terraform
• AWS_SECRET_ACCESS_KEY: The AWS secret access key for Terraform
• SLACK_WEBHOOK_URL: The URL of the Slack Channel webhook to send messages to
• SLACK_API_URL: The Slack API URL to automatically change tag for the on-call person in slack
• SLACK_API_TOKEN: The Slack API token to authenticate with the Slack API
• SLACK_SUBTEAM_ID: The Slack subteam ID of the on-call team (e.g. S123456)
• SLACK_SUBTEAM_NAME: The Slack subteam name of the on-call team (e.g. on-call)
• SSM_USERNAME_USER_ID: This is the Slack ID for the person who is currently on-call.

It's important to note that the prefix SSM must be in lowercase when used in the Incident Manager for proper parsing. For example, if the contact in the Incident Manager is ssm_myname, then the corresponding environment variable should be SSM_MYNAME. The value of this variable should be the Slack ID of the user. This way, the script can correctly identify and notify the on-call person.

So in short, the environment variable syntax is "SSM_contact_unique_id" = "Slack User ID".

2. Build your application to be Lambda compatible

GOOS=linux GOARCH=amd64 go build -o bootstrap

3. Use files from terraform folder to deploy lambda function

terraform init -backend-config="bucket=your-bucket-name" -backend-config="key=terraform.tfstate" -backend-config="encrypt=true"
terraform plan
terraform apply

License

This project is licensed under Apache License 2.0 - see the LICENSE file for details

Author

• KostLinux - Getting errors after error - KostLinux