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| Dir : //opt/tier2c/check_mysql |
#!/opt/imh-python/bin/python3
"""MySQL RADS tool - T2C version"""
import argparse
import configparser
import subprocess
from collections import Counter
import sys
import pymysql
from pymysql.optionfile import Parser as PyMySQLParser
def parse_args():
"""Parse commandline arguments"""
parser = argparse.ArgumentParser(
description='MySQL RADS tool - T2C version'
)
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument(
'--sockets',
action='store_true',
help='Show number of open connections vs max connections',
)
group.add_argument(
'--active',
action='store_true',
help='Display databases with the most currently running queries',
)
args = parser.parse_args()
return args
def get_max_connections() -> int:
"""Read mysqld:max_connections from /etc/my.cnf"""
try:
parser = PyMySQLParser(strict=False)
if not parser.read('/etc/my.cnf'):
return 100 # default
return parser.get('mysqld', 'max_connections')
except configparser.Error:
return 100 # default
def count_mysql_conns() -> None:
"""Count used/available mysql connections
using netstat in case the connections are exhausted"""
try:
# stderr will go to tty
conns = subprocess.check_output(
['netstat', '-an'], encoding='utf-8'
).splitlines()
except subprocess.CalledProcessError:
sys.exit("netstat -an failed")
conns = [x for x in conns if 'ESTABLISHED' in x or 'CONNECTED' in x]
conns = [x for x in conns if ':3306' in x or 'mysql' in x]
max_conns = get_max_connections()
print(f'MySQL Connections: {len(conns)} / {max_conns}')
def show_active() -> None:
"""Show a count of active connections for each mysql user"""
try:
with pymysql.connect(
host='localhost',
database='INFORMATION_SCHEMA',
read_default_file="/root/.my.cnf",
) as conn:
with conn.cursor() as cur:
cur.execute("SELECT USER FROM PROCESSLIST")
active = Counter([x[0] for x in cur.fetchall()])
except pymysql.Error as exc:
sys.exit(str(exc))
sorted_active = sorted(iter(active.items()), key=lambda x: x[1])
for user, count in sorted_active:
print(user, count, sep=': ')
def main():
"""Runs either count_mysql_conns() or show_active()"""
args = parse_args()
if args.sockets:
return count_mysql_conns()
if args.active:
return show_active()
raise NotImplementedError
if __name__ == '__main__':
main()