mysql数据库实例参数对比脚本_MySQL数据库实例参数对比脚本

如何对比两个MySQL实例的参数情况，生产中常会有这样的需求，最近写了个Python脚本，可基本实现该需求。

脚本

#!/usr/bin/python

import MySQLdb,sys

def fetch_variables(ip,user,passwd,port,variable=False):

# Open database connection

try:

db = MySQLdb.connect(host=ip, user=user,passwd=passwd,port=port)

except Exception,e:

print e

exit()

# prepare a cursor object using cursor() method

cursor = db.cursor()

if not variable:

sql = 'show variables'

else:

sql= "show variables like '%"+variable+"%'"

try:

# execute SQL query using execute() method.

cursor.execute(sql)

# Fetch all the rows in a list of lists.

results = cursor.fetchall()

dict={}

for row in results:

dict[row[0]]=row[1]

except:

print "Error: unable to fecth data"

return dict

def dict_to_set(dict):

return set(dict.keys())

def main():

if len(sys.argv)!=3 and  len(sys.argv)!=4:

print 'Usage:',sys.argv[0],'ip:port nip:nport var'

exit()

user = 'root'

password = '123456'

ip, port = sys.argv[1].split(':')

nip,nport=sys.argv[2].split(':')

if len(sys.argv)==3:

variable=False

else:

variable=sys.argv[3]

dict = fetch_variables(ip, user, password, int(port),variable)

ndict = fetch_variables(nip, user, password, int(nport),variable)

set=dict_to_set(dict)

nset=dict_to_set(ndict)

same_variables=set.intersection(nset)

for variable in same_variables:

if dict[variable] != ndict[variable]:

print variable,':',dict[variable],'|',ndict[variable]

if __name__=='__main__':

main()

执行方式

输入：ip:port nip:nport var

功能：如果var为空，表示比较所有参数

带实例参数时，执行结果如下：

[root@mysql-server1 ~]# python diff_parameters.py 192.168.244.145:3306 192.168.244.146:3306 general_log_file

general_log_file : /var/lib/mysql/mysql-server1.log | /var/lib/mysql/keepalived01.log

不带实例参数时，执行结果如下：

[root@mysql-server1 ~]# python diff_parameters.py 192.168.244.145:3306 192.168.244.146:3306

version : 5.6.26-log | 5.6.26

log_bin_index : /var/lib/mysql/mysql-bin.index |

log_bin_basename : /var/lib/mysql/mysql-bin |

pseudo_thread_id : 9 | 104

slow_query_log_file : /var/lib/mysql/mysql-server1-slow.log | /var/lib/mysql/keepalived01-slow.log

server_id : 1 | 2

hostname : mysql-server1 | keepalived01

timestamp : 1462931171.666154 | 1462931171.957681

log_bin : ON | OFF

general_log_file : /var/lib/mysql/mysql-server1.log | /var/lib/mysql/keepalived01.log

max_binlog_size : 134217728 | 1073741824

server_uuid : c063ba6f-aee7-11e5-820e-000c29b05336 | 959bf641-b9e7-11e5-89c7-000c294c5ed4

输出结果解读：

第一列是实例参数，第二列和第三列用“|”隔开，其中第二列是第一个实例的参数值，第三列是第二个实例的参数值。

脚本解读

函数def fetch_variables(ip,user,passwd,port,variable=False)是从数据库中获取实例参数及值。variable=False的作用是来处理var为空和var不为空时的情况。

函数def dict_to_set(dict)是将字典转化为集合，这样对于字典的比较可以转为为集合来操作。