Created
April 16, 2019 18:27
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#!/usr/bin/env python3 | |
import argparse | |
import concurrent.futures | |
import json | |
import logging | |
import subprocess | |
LOGGER = logging.getLogger('docker-healthchecker') | |
def _inspect_containers(container_ids): | |
result = subprocess.run( | |
['docker', 'inspect', *container_ids], | |
stdout=subprocess.PIPE, | |
check=True | |
) | |
return json.loads(result.stdout.decode().strip()) | |
def _is_healthy(inspect_data): | |
container_id = inspect_data['Id'] | |
LOGGER.info('%s - checking', container_id) | |
healthcheck = inspect_data['Config'].get('Healthcheck') | |
if healthcheck: | |
hc_type = healthcheck['Test'][0] | |
hc_args = healthcheck['Test'][1:] | |
if hc_type == 'CMD-SHELL': | |
result = subprocess.run( | |
['docker', 'exec', container_id, '/bin/sh', '-c', hc_args[0]], | |
stderr=subprocess.DEVNULL, | |
stdout=subprocess.DEVNULL | |
) | |
elif hc_type == 'CMD': | |
result = subprocess.run( | |
['docker', 'exec', container_id, *hc_args], | |
stderr=subprocess.DEVNULL, | |
stdout=subprocess.DEVNULL | |
) | |
else: | |
raise NotImplementedError(hc_type) | |
healthy = not bool(result.returncode) | |
LOGGER.info( | |
'%s - %s', | |
container_id, | |
'healthy' if healthy else 'unhealthy' | |
) | |
return healthy | |
def main(): | |
parser = argparse.ArgumentParser() | |
parser.add_argument('container', nargs='*') | |
parser.add_argument('--verbose', action='store_true') | |
args = parser.parse_args() | |
if args.verbose: | |
logging.basicConfig(level=logging.INFO) | |
with concurrent.futures.ProcessPoolExecutor() as pool: | |
futures = { | |
pool.submit(_is_healthy, container): container | |
for container in _inspect_containers(args.container) | |
} | |
for future in concurrent.futures.as_completed(futures): | |
result = future.result() | |
if result is False: | |
pool.submit(_is_healthy, futures[future]) | |
if __name__ == '__main__': | |
main() |
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