python实战系列之MySQL主从状态监控(09）

1. 需求说明
由于openstack底层中MySQL使用了主从AB复制，为了监控数据库的主从状态信息，需要对MySQL的主从状态进行监控，从而保障数据库底层正常运行，为openstack提供更好的功能。本文对数据库执行监控，具体内容参考下面。
2. 程序内容

#!/usr/bin/env python
#_*_ coding:utf8 _*_
#author:happyliu
#用于监控MySQL主从复制状态

import os
import sys
import os.path
import urllib
import urllib2
import MySQLdb
import logging

auth_credentials = {'host':'localhost', 'port':3306, 'user':'root','passwd':'password'}

'''
记录日志
'''
logging.basicConfig(
filename = '/var/log/openstack_MySQL_replication_monitor.log',
filemode = 'a',
format = '%(asctime)s %(filename)s[line:%(lineno)d] %(funcName)s %(levelname)s %(message)s',
datefmt='%a, %d %b %Y %H:%M:%S',
level = logging.INFO

)

def monitor_MySQL_replication():
'''
用于监控MySQL主从复制状态，异常则告警
'''
status = True

try:
conn = MySQLdb.connect(**auth_credentials)
cursor = conn.cursor(cursorclass=MySQLdb.cursors.DictCursor)
cursor.execute('SHOW SLAVE STATUS;')
result = cursor.fetchone()
if result['Slave_IO_Running'] == "Yes" and result['Slave_SQL_Running'] == "Yes":
logging.info('MySQL master/slave replication status is successfully')
else:
logging.error('MySQL Master/Slave replication fail,Please check it')
status = False
except Exception as e:
logging.error(e)
status = False
return status

def send_warnings(receiver,content,title):
'''
发送RTX告警给业务负责人
'''
rtx_url = "http://www.example.com:11770/sendRtxByPost"
data = {
"appId"         :6,
"appKey"        :'password',
"userName"      :receiver,
"title"         :title,
"content"       :content
}
postdata = urllib.urlencode(data)
req = urllib2.Request(rtx_url,postdata)
return urllib2.urlopen(req)

def get_hostname():
'''
获取Linux系统的主机名
'''
return os.environ['HOSTNAME']

def clean_log():
'''
清理日志文件，当文件的大于100M时，则清理该文件,防止日志占用过多空间
'''
log_file = '/var/log/openstack_MySQL_replication_monitor.log'

size = os.path.getsize(log_file) / (1024 * 1024)
if size >= 100:
os.remove(log_file)
logging.info('%s have been remove' % (log_file))

if __name__ == "__main__":

clean_log()
warn_receiver = "happy;"
if monitor_MySQL_replication():
send_warnings(receiver=warn_receiver,content='云平台MySQL主从复制状态失败,请检查数据库状态',title=get_hostname())

本文出自 “Happy实验室” 博客，谢绝转载！