Simple bot I wrote to avoid having unecessary active instances on Amazon Web Services (AWS). It uses AWS CLI to check for active EC2 instances / EMR clusters and sends reminders via the Slack messaging app to the corresponding user.

• Python 2.7
• Slackclient Python module
• Slack account / workspace
• Slack API token (https://api.slack.com/)
• Amazon Web Services (AWS) account
• AWS Command Line Interface (CLI) configured

Cloning the repository into your home folder:

cd ~/
git clone https://github.com/brdeleeuw/aws-ec2-slackbot

Ìf you don't have the Python Slackclient module:

pip install slackclient

Adjust slack_credentials_example.py file and add your auth token. Save as slack_credentials.py

Adjust user_info_example.py:

• Add the username on your operating system
• Add the names of your AWS profiles found in ~/.aws/config file
• Add the keypair-username combinations as shown in the example.
• Save as user_info.py.

To make the run_bot.py file executable, cd into the directory and make it executable:

cd ~aws-ec2-slackbot/src
chmod +x run_bot.py

Also, don't remove the #!/usr/bin/python shebang at the top of the script.

You may need to adjust the log_file_path variable in aws_functions.py to the directory where you cloned the repository to if you didn't choose the home directory.

To send reminders, we can have the file run in a cronjob.

crontab -e

Then add whenever you want the file to run. Example of a crontab entry to send a reminder at 16:30, 17:00 and 17:30 every day:

#min hour day-of-month  month  day-of-week  commannd
30    16        *         *        *         cd ~/aws-ec2-slackbot/src/ && /usr/bin/python ~/aws-ec2-slackbot/src/run_bot.py  >> ~/aws-ec2-slackbot/src/logs/run_bot_output.txt  2>&1
00    17        *         *        *         cd ~/aws-ec2-slackbot/src/ && /usr/bin/python ~/aws-ec2-slackbot/src/run_bot.py  >> ~/aws-ec2-slackbot/src/logs/run_bot_output.txt  2>&1
30    17        *         *        *         cd ~/aws-ec2-slackbot/src/ && /usr/bin/python ~/aws-ec2-slackbot/src/run_bot.py  >> ~/aws-ec2-slackbot/src/logs/run_bot_output.txt  2>&1