MySQL主从、字典死锁、连接数的Python监控脚本

#!/usr/bin/python
# MySQL主从集中监控脚本
# 请在MySQL上执行如下语句，将跑脚本的机器授权一个db_monitor账号。
# grant SHOW VIEW,REPLICATION CLIENT,SHOW DATABASES,PROCESS on *.* to db_monitor@'192.168.1.10';
import MySQLdb
import os
import datetime

# 发送一个字符串告警，公司特有告警系统，可以改成其他监控方式，比如短信或邮件
def report_alarm(attr, err_msg):
    os.system('/usr/local/agenttools/agent/agentRepStr %s "%s" >/dev/null' % (attr, err_msg))

# 上报一个数值型告警，也是特有告警系统
def send_repnum(attr, num):
    os.system('/usr/local/agenttools/agent/agentRepNum %s "%s" >/dev/null' % (attr ,num) )

def monitor(db_host):
    try:
        cxn=MySQLdb.connect(db_host, 'db_monitor', '', db='mysql')   
    except MySQLdb.Error, e:  
        try:  
            sqlError =  "Error %d:%s" % (e.args[0], e.args[1])  
        except IndexError:  
            sqlError = "MySQL Error:%s" % str(e)
        report_alarm(36320, sqlError)
    
    #get mysql version
    cur=cxn.cursor()
    cur.execute('select version()')
    for item in cur.fetchall():
        if '5.0.' in item[0]:
            mysql_version = 'low'
        else:
            mysql_version = 'high'
    #show slave status
    cur=cxn.cursor()
    cur.execute('show slave status')
    for item in cur.fetchall():
        replicate_error = item[19]
        if mysql_version == 'low':
            seconds_behind_master = item[-1]
        else:
            seconds_behind_master = item[32]
    #show processlist
    cur=cxn.cursor()        
    cur.execute('show processlist')
    connect_num = len(cur.fetchall()) 
    meta_lock_num = cur.fetchall().count("meta lock")
    cxn.close() 
    return replicate_error,seconds_behind_master,connect_num,meta_lock_num

print datetime.datetime.now()

for host in open('%s/hosts.list'% os.path.dirname(os.path.realpath(__file__))):
    host = host.strip('\n')
    replicate_error = ''
    seconds_behind_master = 0
    connect_num = 0
    meta_lock_num = 0
    replicate_error,seconds_behind_master,connect_num,meta_lock_num = monitor(host)
    try:
        Seconds_behind_master = int(seconds_behind_master)
    except:
        Seconds_behind_master = seconds_behind_master
    print '==============================='
    print 'Infomation of %s' % host
    print "The Num of metalock   : %s" % meta_lock_num
    print "The Num of connection : %s" % connect_num
    # 上报当前连接数
    send = send_repnum(36713, connect_num)
    # 上报字典锁数量
    send = send_repnum(36715, meta_lock_num)
    if len(replicate_error) > 0:
        print replicate_error
        # 如果主从同步出现问题，就发送告警
        report_alarm(36320, '%s: Replicate error' % host)
    elif Seconds_behind_master > 600:
        print "Seconds behid master: %s" % Seconds_behind_master
        # 如果主从延迟超过600s，就发送告警
        report_alarm(36320, '%s: Seconds behind master ge 600' % host)
    #else:
    #   print host + " is OK!"
print '==============================='