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[Monit] Fix in memory_checker, skip fetching running containers if Docker engine is not running #30

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[Monit] Fix in memory_checker, skip fetching running containers if Docker engine is not running #30

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07d2da3
[Monit] Fix in memory_checker, skip fetching running containers if Do…
liorghub Jul 18, 2022
809f828
Fix review comments
liorghub Jul 18, 2022
5d3574a
Fix second review comments
liorghub Jul 18, 2022
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9 changes: 9 additions & 0 deletions files/image_config/monit/memory_checker
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,11 @@ def check_memory_usage(container_name, threshold_value):
sys.exit(4)


def is_service_active(service):
status = subprocess.run("systemctl is-active --quiet {}".format(service), shell=True, check=False)
return status.returncode == 0


def get_running_container_names():
"""Retrieves names of running containers by talking to the docker daemon.

Expand Down Expand Up @@ -128,6 +133,10 @@ def main():
parser.add_argument("threshold_value", type=int, help="threshold value in bytes")
args = parser.parse_args()

if not is_service_active("docker"):
syslog.syslog(syslog.LOG_INFO,"Skipping memory check: docker daemon is down")
sys.exit(0)

running_container_names = get_running_container_names()
if args.container_name in running_container_names:
check_memory_usage(args.container_name, args.threshold_value)
Expand Down