Script to check ECS agents down on the specified regions

ecs-agents-monitor.py

#!/usr/bin/python3
#
# This will output the EC2 instance id of the ECS cluster instances
# which have the ECS agent down, on the region this saltmaster runs on.
#
# Requires: sudo apt install python3-pip; pip3 install boto3
#
# You can use this with https://github.com/mheffner/awsam
# for easy AWS vars management, eg:
# aem use pingdom-prod
# aenv python3 ecs-agents-monitor.py

import boto3
import syslog
import datetime
now = datetime.datetime.now()

regions = ['eu-west-1','us-east-1']

for region in regions:
    client = boto3.client('ecs',region_name=region)

    ecs_clusters = client.list_clusters()

    # Look for instances with the ECS agent down
    # Iterate through the ECS clusters
    for ecs_cluster in ecs_clusters['clusterArns']:

        instances = client.list_container_instances(
            cluster=ecs_cluster,
            status='ACTIVE'
        )

        # Iterate through the ECS Instances in the cluster
        for instance in instances['containerInstanceArns']:
            desc_instances = client.describe_container_instances(
                cluster=ecs_cluster,
                containerInstances=[instance]
            )

            # Check if the instance has the ECS agent down
            if desc_instances['containerInstances'][0]['agentConnected'] == False:
                syslog.syslog('ecs-agents-monitor - Time: {}'.format(now))
                syslog.syslog('ecs-agents-monitor - ECS Cluster: {}'.format(ecs_cluster.split('/')[1]))
                syslog.syslog('ecs-agents-monitor - ECS Container Instance: {}'.format(instance.split('/')[1]))
                syslog.syslog('ecs-agents-monitor - EC2 Instance ID: {}'.format(desc_instances['containerInstances'][0]['ec2InstanceId']))
                syslog.syslog('ecs-agents-monitor - ECS Agent Version: {}'.format(desc_instances['containerInstances'][0]['versionInfo']['agentVersion']))
                syslog.syslog('ecs-agents-monitor - ECS Agent Status: {}'.format(desc_instances['containerInstances'][0]['agentConnected']))