Example of Zabbix script for MySQL

mon_mysql.py

#!/usr/bin/env python

import sys
import argparse
import subprocess

try:
    from lxml import etree
except ImportError:
    try:
        import xml.etree.cElementTree as etree
    except ImportError:
        try:
            import xml.etree.ElementTree as etree
        except ImportError:
            try:
                import cElementTree as etree
            except ImportError:
                import elementtree.ElementTree as etree


SERVICE_NAME = 'mysql'


def _check_service(func):
    def __check_service(*args, **kwargs):
        try:
            res = subprocess.check_output(['which', SERVICE_NAME, ])
            return func(res.strip(), *args, **kwargs)
        except (subprocess.CalledProcessError) as e:
            sys.exit("Cannot locate '%s'. Please check installation.\n" % SERVICE_NAME)
    return __check_service


@_check_service
def _call(service, query, user=None, passwd=None):
    args = [service, '--xml',
        user and '-u%s' % user, (user and passwd) and '-p%s' % passwd,
        '-e', '%s;' % query, ]
    try:
        res = subprocess.check_output([arg for arg in args if arg])
        return etree.fromstring(res.strip())
    except (subprocess.CalledProcessError) as e:
        sys.exit("Failed to call '%s'.\n" % ' '.join(args))
    except (etree.ParseError) as e:
        sys.exit("Failed to parse response. %s" % e)


def get_global_statuses(entry, user=None, passwd=None):
    resultset = _call('SHOW GLOBAL STATUS', user=user, passwd=passwd)
    resultset.tag == 'resultset' or sys.exit("Cannot get 'resultset'")
    for row in [row for row in resultset.findall('.//row') if row.tag == 'row']:
        fields = row.getchildren()
        if len(fields) != 2:
            continue
        variable_name, value = fields
        if variable_name.text.lower() == entry.lower():
            return '%s' % value.text
    sys.exit("Failed to get entry '%s'" % entry)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Set mysql user and password.')
    parser.add_argument('entry', help='Entry')
    parser.add_argument('-u', '--user', help='MySQL user')
    parser.add_argument('-p', '--passwd', help='MySQL password')

    args = parser.parse_args()
    entry, user, passwd = args.entry, args.user, args.passwd
    sys.stdout.write(get_global_statuses(entry))

$ cat /etc/zabbix/zabbix_agentd.conf
...
UserParameter=mysql.innodb_buffer_pool_reads,/path/to/mon_mysql.py innodb_buffer_pool_reads
...