ec2-slackbot 0.1.10

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Slackbot for AWS EC2 Management

This repository contains a Slackbot that allows you to manage AWS EC2 instances directly from Slack. The bot is built with Python, using Flask for the web server and the slack-sdk for interacting with the Slack API.

Features

• Launch EC2 instances for connecting with SSH.
• Start, stop and terminate EC2 instances.
• Change EC2 instance type.
• Create, attach, detach, and destroy EBS volumes.
• Optionally mount SageMaker Studio EFS or EBS volume.
• Warn users to consider terminating long-running EC2 instances.

Usage

The bot is designed to be used with Slack slash commands. The following commands are supported:

Command	Description
/ec2 key	Upload your public SSH key for EC2 instances. This opens a modal where you can paste your public key.
/ec2 up	Launch an EC2 instance. This opens a modal where you can select the AMI, instance type, and other options.
/ec2 down	Terminate running EC2 instances. This opens a modal where you can select the instances to terminate.
/ec2 change	Modify the configuration of a running EC2 instance. This opens a modal where you can select the instance and the new instance type.
/ec2 start	Start stopped EC2 instances. This opens a modal where you can select the instances to start.
/ec2 stop	Stop running EC2 instances. This opens a modal where you can select the instances to stop.
/ebs create	Create the EBS volume (limited to one per user). This opens a modal where you can select the size.
/ebs resize	Resize the EBS volume. This opens a modal where you can select the new size.
/ebs attach	Attach the EBS volume to an EC2 instance. This opens a modal where you can select the instance to attach to.
/ebs detach	Detach the EBS volume from any EC2 instances.
/ebs destroy please	Destroy the EBS volume.

Configuration

The bot's configuration is stored in a config.yaml file. An example configuration is provided in config.yaml.example. The configuration includes AWS region, subnet, and security group details, as well as AMI and instance type options.

SSM (Simple Systems Manager)

The instances establish a connection using SSH over SSM.

The following steps need to be performed on AWS:

1. Create a role and attach the AmazonSSMManagedInstanceCore policy to it. Then, set the iam_instance_profile in config.yaml to the name of this profile.

2. If your subnet is private, you will need to configure your VPC endpoints to allow SSM connections.

3. Make sure your AWS account is set to have an "advanced activation tier":

   aws ssm update-service-setting \
       --setting-id arn:aws:ssm:<region>:<account>:servicesetting/ssm/managed-instance/activation-tier \
       --setting-value advanced
   

4. Ensure that the IAM policy for the user includes the following permissions to start an SSM session:

   {
       "Version": "2012-10-17",
       "Statement": [
           {
               "Effect": "Allow",
               "Action": "ssm:StartSession",
               "Resource": [
                   "arn:aws:ec2:*",
                   "arn:aws:ssm:*:*:document/AWS-StartSSHSession"
               ],
               "Condition": {
                   "BoolIfExists": {
                       "ssm:SessionDocumentAccessCheck": "true"
                   }
               }
           }
       ]
   }
   

For your local machine, users need to:

1. Install the Session Manager plugin.

2. Insert the following lines into ~/.ssh/config:

   # >>> AWS SSM config >>>
   Host i-* mi-*
       StrictHostKeyChecking accept-new
       ForwardAgent yes
       ServerAliveInterval 60
       ServerAliveCountMax 10000
       ProxyCommand aws ssm start-session --target %h --document-name AWS-StartSSHSession --parameters "portNumber=%p"
   # <<< AWS SSM config <<<
   

After these configurations, users can SSH into instances using:

ssh ubuntu@i-...  # i-... is the instance id

Mount SageMaker Studio EFS

The "classic" version of SageMaker Studio mounts a shared EFS drive on all instances. One key advantage of using a regular EC2 instance is the ability to run docker directly, unlike SageMaker Studio apps which operate within a docker container.

In order to mount the EFS folder associated with the Slack user, you need to specify the efs_ip of the EFS that corresponds to the subnet, and the sagemaker_studio_domain_id in the config.yaml file. Additionally, the security_groups should incorporate the security-group-for-outbound-nfs used by SageMaker Studio. The Slack user name should correspond to the SageMaker Studio user name (except that dots are replaced with hyphens).

Mount EBS

Every Slack user can create an EBS volume with the /ec2 create_volume command, which they can mount at $HOME. During the initial setup, the volume will be formatted, and the $HOME directory will be configured. EBS volumes offer higher performance compared to EFS due to their non-networked nature, but they are typically limited to being attached to a single EC2 instance at a time.

If you choose not to mount the EBS at $HOME, you can use it as an additional device. For more details, refer to the section "Common Operations with EBS Volumes".

Note: EBS volumes of type io1 and io2 support multi-attach, but this requires a cluster setup.

Deployment Steps

1. Install the necessary dependencies by running make install in your terminal. Alternatively you can run pip install ec2-slackbot.

2. Create a new Slack app. This app will interact with your deployment.

3. Update the .env file with your SLACK_BOT_TOKEN and SLACK_SIGNING_SECRET. These are essential for the Slack app to function correctly.

4. Start the application by executing make run or ec2-slackbot --config=config.yaml in your terminal. This will start the server on port 3000. To make the server accessible publicly, you can use a tool like ngrok to forward the port.

5. Configure your Slack app with the following manifest settings:

   ...
   features:
     bot_user:
       display_name: EC2
       always_online: false
     slash_commands:
       - command: /ec2
         url: https://<your-url>/slack/commands
         description: EC2
         usage_hint: key | up | down | change | start | stop
         should_escape: false
       - command: /ebs
         url: https://<your-url>/slack/commands
         description: EBS
         usage_hint: create | resize | attach | detach | destroy
         should_escape: false
   oauth_config:
     scopes:
       bot:
         - chat:write
         - commands
         - im:write
         - users:read
   settings:
     interactivity:
       is_enabled: true
       request_url: https://<your-url>/slack/events
   ...
   

6. Ensure the IAM role assigned to ec2-slackbot includes the following permissions to manage EC2 instances and EBS volumes:

   {
       "Version": "2012-10-17",
       "Statement": [
           {
               "Effect": "Allow",
               "Action": [
                   "ec2:DescribeInstances",
                   "ec2:RunInstances",
                   "ec2:TerminateInstances",
                   "ec2:DescribeVolumes",
                   "ec2:StopInstances",
                   "ec2:StartInstances",
                   "ec2:ModifyInstanceAttribute",
                   "ec2:CreateVolume",
                   "ec2:DeleteVolume",
                   "ec2:AttachVolume",
                   "ec2:DetachVolume",
                   "ec2:ModifyVolume",
                   "ec2:DescribeKeyPairs",
                   "ec2:ImportKeyPair",
                   "ec2:DeleteKeyPair",
                   "sagemaker:DescribeUserProfile",
                   "iam:PassRole"
               ],
               "Resource": [
                   "arn:aws:ec2:*",
                   "arn:aws:sagemaker:*",
                   "arn:aws:iam:*"
               ]
           }
       ]
   }
   

Common Operations with EBS Volumes

The EBS device will either be /dev/xvdh or /dev/nvme1n1 depending on the type of the EC2 instance.

if [ -e /dev/xvdh ]; then
    device=/dev/xvdh
elif [ -e /dev/nvme2n1 ]; then
    device=/dev/nvme2n1
else
    device=/dev/nvme1n1
fi

To format the EBS volume:

sudo mkfs -L ebs_volume -t ext4 $device

To mount the EBS volume at /mnt and ensure it is mounted automatically after a reboot:

echo "LABEL=ebs_volume /mnt ext4 defaults,nofail 0 2" | sudo tee -a /etc/fstab
sudo mount /mnt

If you resize the EBS volume with /ec2 resize_volume then you will need to run

sudo resize2fs $device

Development

If you want to make changes to the code, it is recommended that you run make install-dev to install the development dependencies. This will install the necessary packages for testing and formatting the code, as well as the pre-commit hooks.

Tests can be run using make test. The tests are run using localstack to simulate AWS services locally. For this to work, you need to have docker and the docker compose plugin installed on your machine. Once you have finished testing, you can stop localstack by running make stop-localstack.

Alternatively, you run the tests on your AWS infrastructure with make test-on-aws. This will run the tests on your AWS account, so make sure you have the necessary permissions and configurations set up.

If you want to test the app in Slack before deploying to production, you can either deploy it in a separate Slack workspace or you can set the environment variable EC2_SLACKBOT_STAGE to test- and create a separate app which will respond to the commands /test-ec2 and /test-ebs.

To debug the startup scripts, you can review the output in the /var/log/cloud-init-output.log file on the EC2 instance.