监控数据库是否可写，如果你的监控脚本逻辑是，写入数据库成功后显示成功，反之显示不成功然后报警。那么难题来了，数据库真的无法写入了，你的监控脚本的写入命令也会被mysql hang住，一直卡在那里，直到天荒地老，根本无法实现报警。那换个思路，如果设置个超时时间，是不是更好。

#!/usr/bin/env python
# -*-coding:utf8-*-
import MySQLdb
import re
import smtplib
import json
from email.mime.text 
import MIMEText
import sys
import time
import multiprocessing
reload(sys)
sys.setdefaultencoding('utf8')


def mysql_select(sql, pipe):
    try:
        conn = MySQLdb.connect(host='xxx.xxx.xxx.xxx',user='xxxx',passwd='xxxx',db='xxxx',port=xxxx,charset='utf8',connect_timeout=10)
        cursor = conn.cursor()
        cursor.execute(sql)
        result = cursor.fetchall()
        cursor.close()
        conn.commit()
        conn.close()
        pipe.send('successful')    
     except Exception,e:
        pipe.send("zabbix 数据库异常: %s" % e) 

def query_with_timeout(sql):
    pipe_out, pipe_in = multiprocessing.Pipe(False)
    subproc = multiprocessing.Process(target=mysql_select,args=(sql, pipe_in))
    subproc.start()
    subproc.join(timeout=3)    
    if pipe_out.poll():
        ex_c = pipe_out.recv()    
    else:
        ex_c = "zabbix 数据库无法写入"
    subproc.terminate()    
    #raise Exception("Query %r ran for >%r" % (sql, 5))
    raise Exception(ex_c)
###
    
def se_mail(mail_result):
    now_time = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
    sys.setdefaultencoding('utf-8')
    SUBJECT = "数据库监控"
    TO = "xxxx@ptthink.com"
    FROM = "ooooo@ptmind.com"
    msg = MIMEText("""
        
            
            
            
                
                    
                       中国区zabbix数据库监控
                    
                         告警区域
                         中国
                    
                    
                         主机名称
                         xxx.xxx.xxx.xxx
                    
                    
                         告警项目
                         zabbix数据库监控
                    
                    
                         告警级别
                         严重
                    
                    
                         告警状态
                         PROBLEM
                    
                    
                         详细内容
                         """ + mail_result + """
                    
                         发生时间
                         """ + now_time + """
                    
                
            
        ""","html","utf-8")
    msg['Subject'] = SUBJECT
    msg['From']=FROM
    msg['To']=TO    
    try:
        server = smtplib.SMTP('localhost')
        server.sendmail(FROM, TO, msg.as_string())
        server.quit()        
        print "邮件发送成功！"
    except Exception, e:        
        print "失败："+str(e)
        
###
    
if __name__ == '__main__':    
    #创建监控数据库连接，与是否可写，的监控表，下面是创建语句
    #sql_user_info = """
    #CREATE TABLE IF NOT EXISTS db_check_table (
    #itemid INT(20),
    #applicationid INT(20),
    #hostid INT(20),
    #name  VARCHAR(255),
    #du_name  VARCHAR(255),
    #item_name   VARCHAR(255)
    #)
    #"""
    insert_sql = """insert into db_check_table values ('10211','13564','456789','test-172.5.6.7','cpu','cpu ldie')"""   
    try:
        query_with_timeout(insert_sql)    
    except Exception,e:
        mail_result = str(e)        
        if mail_result != "successful" :
            se_mail(mail_result)