ecs_list_resources.py

import boto3
import sys

client = boto3.client('ecs')

def print_resource_usage(usage):
    # print usage
    print "Instance\t\t\t\tCPU\tMemory\tPorts"
    print "========================================================================"
    for instance in usage.keys():
        print ("%s\t%d\t%d\t%s" % (usage[instance]['shortName'],
                                   usage[instance]['CPU'],
                                   usage[instance]['Memory'],
                                   usage[instance]['Ports']
                                   )
               )

def get_resource_usage(cluster, instances):
    resource_usage = {}
    response = client.describe_container_instances(cluster=cluster, containerInstances=instances)['containerInstances']

    for instance in response:
        instanceArn = instance['containerInstanceArn']
        resource_usage[instanceArn] = {}
        resource_usage[instanceArn]['shortName'] = instanceArn.split('/')[1]
        resource_usage[instanceArn]['CPU'] = filter(
            lambda x: x['name'] == 'CPU',
            instance['remainingResources'])[0]['integerValue']
        resource_usage[instanceArn]['Memory'] = filter(
            lambda x: x['name'] == 'MEMORY',
            instance['remainingResources'])[0]['integerValue']
        ports = filter(
            lambda x: x['name'] == 'PORTS',
            instance['remainingResources'])[0]['stringSetValue']
        resource_usage[instanceArn]['Ports'] = [ str(port) for port in ports ]
    return resource_usage

def get_container_instances(cluster):
    instances = client.list_container_instances(cluster=cluster)['containerInstanceArns']
    return instances


def main():
    usage = "Usage: ecs_list_resources.py <cluster_name>"
    if len(sys.argv) < 2:
        print usage
        sys.exit(1)
    cluster = sys.argv[1]
    instances = get_container_instances(cluster)
    resource_usage = get_resource_usage(cluster, instances)
    print_resource_usage(resource_usage)

if __name__ == "__main__":
    main()