clean old partitions in clickhouse

cl_clean.yaml

databases:
    - logs: 7
    - vms:  9
    - statistics:  20

connect_line: '127.0.0.1'
log_file: 'cl_clean_partitions.log'

cl_clean_part.py

#!/usr/bin/env python

import logging
import yaml
import argparse
import os
import os.path

import time
import datetime
import clickhouse_driver


parser = argparse.ArgumentParser(description='Clean old clickhouse partitions')
parser.add_argument('--config', dest='config_path', help='path to config path')
parser.add_argument('-s', '--simulate', action='store_true')
parser.add_argument('--debug', action='store_true')

args = parser.parse_args()
#print(args.config_path)
#print(args.simulate)

if args.config_path == None:
    print("Need config path via --config flag")
    os._exit(1)

if not os.path.isfile(args.config_path):
    print("Config file with name \"%s\" doesnt exist" % args.config_path)
    os._exit(1)

with open(args.config_path, 'r') as stream:
    try:
       config = yaml.load(stream)
    except yaml.YAMLError as exc:
        print(exc)


#print(config)
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)

formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')

fh = logging.FileHandler(config['log_file'])
fh.setLevel(logging.DEBUG)
fh.setFormatter(formatter)
logger.addHandler(fh)

ch = logging.StreamHandler()
if args.debug:
    ch.setLevel(logging.DEBUG)
else:
    ch.setLevel(logging.WARNING)
#ch.setLevel(logging.DEBUG)
ch.setFormatter(formatter)
logger.addHandler(ch)


client = clickhouse_driver.Client(config['connect_line'])

all_databases_raw = client.execute("SHOW databases")
all_databases = []
for d in all_databases_raw:
    all_databases.append(d[0]) 


for db in config['databases']:
    dbname = db.keys()[0]
    max_days = db[dbname]
    logger.info("Try clean db '%s' with %d max days" % (dbname, max_days))
    if not dbname in all_databases:
        logger.warning("We have not database %s - continue" % dbname)
        continue
    query = "SHOW TABLES FROM " + dbname
    tables = client.execute(query)
    for tables_t in tables:
        table = tables_t[0]
        logger.debug("we found table %s in db %s" % (table, dbname))
        query = "select partition from (select partition,max(max_date) as m from system.parts where database = '%s' and table = '%s' group by partition) where m < today()-%d order by partition;" % (dbname,table,max_days)
        #print(query)
        partitions = client.execute(query)
        for partition_t in partitions:
            partition = partition_t[0]
            partition_delete_command = "ALTER TABLE %s.%s DROP PARTITION '%s'" % (dbname, table, partition)
           #print(partition)
            #print(partition_delete_command)
            if args.simulate:
                print("Simulate only! Not execute \"%s\"" % partition_delete_command)
            else:
                client.execute(partition_delete_command)

Need python-yaml and pip install clickhouse-driver
Based on https://fastnetmon.com/data-retention-for-clickhouse-persistent-data-storage/