CloudWatch metric for AWS ECS container storage

cloudwatch_ecs_container.py

#!/usr/bin/python
import subprocess
import boto3

cw = boto3.client('cloudwatch', region_name='eu-west-1')
ctn_ip = subprocess.check_output('curl --silent ifconfig.co', shell=True).strip()

stats_lines = subprocess.check_output([
  '/usr/bin/docker',
  'stats',
  '--no-stream',
  '--format',
  '"{{ .Container }},{{ .Name }}"'
]).split('\n')

for stats_line in stats_lines:
  stats = stats_line[1:-1].split(',')

  if len(stats) != 2:
    continue

  ctn_id,ctn_name = stats

  try:
    storage_perc = int(subprocess.check_output('docker exec %s /bin/df -H / --output=pcent | tail -n 1 | cut -d ''%%'' -f 1' % ctn_id, shell=True))
  except subprocess.CalledProcessError:
    continue
  except ValueError:
    continue

  cw.put_metric_data(
    Namespace='Phoenix',
    MetricData=[
            {
        'MetricName': 'StoragePerc',
        'Unit': 'Percent',
        'Value': storage_perc,
        'Dimensions': [
          {'Name': 'ContainerName', 'Value': ctn_name},
          {'Name': 'ContainerID', 'Value': ctn_id},
          {'Name': 'ContainerInstance', 'Value': ctn_ip}
        ]
      }
    ]
  )

  #response = cw.put_metric_alarm(
  #  AlarmName='Phoenix Storage Alarm',
  #  EvaluationPeriods=1,
  #  Threshold=80,
  #  ComparisonOperator='GreaterThanOrEqualToThreshold',
  #  Namespace='Phoenix',
  #  MetricName='StoragePerc',
  #  Period=300,
  #  Statistic='Maximum'
  #)