Print Docker containers log size

docker_logs_size.py

#! /usr/bin/env python3

# Print Docker containers log size
# Needs to 'pip install docker' first
# 
# $ sudo ./docker_logs_size.py
# 658675d834 reverse-proxy_1: 10.31 KB
# 85f65ece1d webroot_1: 13.1 KB
# 34c6cc54ab redis_1: 18.81 KB
# 05a3c8b895 mysql_8.0_1: 48.69 KB
# ...    


import os
import sys
from pathlib import Path

# Following is considering you are using a virtualenv where docker library was installed. 
# Comment out if docker is installed globally
activate_this = os.path.join(Path(__file__).resolve().parent, 'venv', 'bin', 'activate_this.py')
exec(open(activate_this).read(), {'__file__': activate_this})

import docker

# From https://stackoverflow.com/a/14996816/2824942
def humansize(nbytes):
    suffixes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB']
    i = 0
    while nbytes >= 1024 and i < len(suffixes)-1:
        nbytes /= 1024.
        i += 1
    f = ('%.2f' % nbytes).rstrip('0').rstrip('.')
    return '%s %s' % (f, suffixes[i])

def main():
    client = docker.from_env()

    containers = client.containers.list()
    for container in containers:
        log = client.api.inspect_container(container.short_id)['LogPath']        
        print('{} {}: {}'.format(container.short_id, container.name, humansize(os.path.getsize(log))))

    client.close()

if __name__ == '__main__':
    sys.exit(main())