工作需要,对公司的MysqL数据库进行备份,赶上刚刚开始学python,看了一套简单的python教学视频,简单的写了个备份脚本,个人表示 对python 的class 、function、build-in function 、私有变量、全局变量 等等,该怎么用,啥时候用等 毫无概念 ,仅此记录一下吧,也欢迎路过的pythoner赐教。
个人已知的一些问题:
1、该脚本必须要求 MysqL配置文件内的所有行为 key=value的格式,并且不能存在多余的注释,否则ConfigParser模块解析配置文件时会出错,由于没研究过ConfigParser是不是有容错的方法可以调用,也没时间写容错处理,而是通过整理my.ini 配置文件使其符合ConfigParser的要求解决的。后面会附上我用的MysqL配置文件。
2、大量使用类私有成员变量,因为完全不知道python 变量、类方法、等等啥时候该私有化,以及有啥区别,只知道类私有成员变量在别的脚本中import 或者继承时,是不可见的。
3、比较多的进行文件操作,以及传值操作,目前只保证按正确格式传值没问题,没有做多余的容错处理。 4、大量的在进行字符串拼接,第一次写运维相关脚本,由于要调用系统命令,和传递很多参数,也不会subprocess模块,不知道别人写运维脚本都具体咋做,就直接拼接了。
5、其他未知的bug、未发现的逻辑错误等等。
环境:
- Server : Dell PowerEdge T110
- OS: CentOS 6.3_x86_64
- PythonVersion: 2.7.3
- MysqLVersion: 5.5.28 linux x86_64
MysqLBackupScript.py
# @param 用Python备份MysqL 数据库
# @author 编程之家 jb51.cc|jb51.cc
#!/usr/bin/env python
# coding: utf8
# script MysqLBackupScript
# by Becareful
# version v1.0
"""
This scripts provides auto backup MysqL(version == 5.5.x) database .
"""
import os
import sys
import datetime #用于生成备份文件的日期
import linecache #用于读取文件的指定行
import ConfigParser #解析MysqL配置文件
class DatabaseArgs(object):
"""
"""
__MysqL_BASE_DIR = r'/usr/local/MysqL' #MysqL安装目录
__MysqL_BIN_DIR = __MysqL_BASE_DIR + '/bin' #MysqL二进制目录
__MysqL_CONFIG_FILE = r'/usr/local/MysqL/my.cnf' #MysqL配置文件
__ONEDAY = datetime.timedelta(days=1) #一天的时长,用于计算下面的前一天和后一天日期
__TODAY = datetime.date.today() #当天日期格式为 YYYY-MM-DD
__YESTERDAY = __TODAY - __ONEDAY #计算昨天日期
__TOMORROW = __TODAY + __ONEDAY #计算明天日期
__WEEKDAY = __TODAY.strftime('%w') #计算当天是一星期的星期几
__MysqL_DUMP_ARGS = { #用一个字典存储MysqLdump 命令备份数据库的参数
'MYISAM': ' -v -E -e -R --triggers -F -n --opt --master-data=2 --hex-blob -B ','INNODB': ' -v -E -e -R --triggers -F --single-transaction -n --opt --master-data=2 --hex-blob -B '
}
__DUMP_COMMAND = __MysqL_BIN_DIR + '/MysqLdump' #MysqLdump 命令的 路径 用于dump MysqL数据
__FLUSH_LOG_COMMAND = __MysqL_BIN_DIR + '/MysqLadmin' #MysqLadmin 命令的路径 ,用于执行 flush-logs 生成每天增量binlog
__BACKUP_DIR = r'/backup/' # 指定备份文件存放的目录
__PROJECTNAME = 'example' # 指定需要备份的数据库对应的项目名,将来会生成 projectname-YYYY-MM-DD.sql 等文件
__DATABASE_LIST = [] # 指定需要备份的数据库名,可以是多个,使用列表
__HOST = 'localhost'
__PORT = 3306
__USERNAME = 'root'
__PASSWORD = ''
__LOGINARGS = '' # 如果在localhost登陆,需要密码,可以设定登陆的参数,具体在下面有说明
__LOGFILE = __BACKUP_DIR + '/backup.logs'
def __init__(self,baseDir=__MysqL_BASE_DIR,backDir=__BACKUP_DIR,engine='MYISAM',projectName=__PROJECTNAME,dbList=__DATABASE_LIST,host=__HOST,port=__PORT,user=__USERNAME,passwd=__PASSWORD):
"""
实例化对象时传入的参数,如不传入默认使用类的私有成员变量作为默认值
:param baseDir:
:param backDir:
:param engine:
:param projectName:
:param dbList:
:param host:
:param port:
:param user:
:param passwd:
"""
self.__MysqL_BASE_DIR = baseDir
self.__BACKUP_DIR = backDir
self.__PROJECTNAME = projectName
self.__DATABASE_LIST = dbList
self.__HOST = host
self.__PORT = port
self.__USERNAME = user
self.__PASSWORD = passwd
self.__ENGINE = self.__MysqL_DUMP_ARGS[engine]
#下面定义了如需登陆时,参数 其实就是生成 这样的格式 “-hlocalhost -uroot --password=‘xxxx’”
self.__LOGINARGS = " -h" + self.__HOST + " -P" + str(
self.__PORT) + " -u" + self.__USERNAME + " --password='" + self.__PASSWORD + "'"
self.checkDatabaseArgs() #调用检查函数
def __getconfig(self,cnf=__MysqL_CONFIG_FILE,item=None): # 解析MysqL配置文件的小函数,简单封装了下,传入一个值作为my.cnf的key去查找对应的value
__mycnf = ConfigParser.ConfigParser()
__mycnf.read(cnf)
try:
return __mycnf.get("MysqLd",item)
except BaseException,e:
sys.stderr.write(str(e))
sys.exit(1)
def __getBinlogPath(self): # 取每天需要增量备份的binlog日志的绝对路径,从MysqL的binlog.index文件取倒数第二行
__BINLOG_INDEX = self.__getconfig(item='log-bin') + '.index'
if not os.path.isfile(__BINLOG_INDEX):
sys.stderr.write('BINLOG INDEX FILE: [' + __BINLOG_INDEX + ' ] NOT FOUND! \n')
sys.exit(1)
else:
try:
__BINLOG_PATH = linecache.getline(__BINLOG_INDEX,len(open(__BINLOG_INDEX,'r').readlines()) - 1)
linecache.clearcache()
except BaseException,e:
sys.stderr.write(str(e))
sys.exit(1)
return __BINLOG_PATH.strip()
def flushDatabaseBinlog(self): # 调用此函数,将会执行 MysqLadmin flush-logs,刷新binlog日志
return os.popen(self.__FLUSH_LOG_COMMAND + self.__LOGINARGS + ' flush-logs')
def dumpDatabasesql(self): #|通过MysqLadmin 对指定数据库进行全备
if not os.path.isfile(self.__BACKUP_DIR + '/' + self.__PROJECTNAME + '/' + str(self.__YESTERDAY) + '-' + self.__PROJECTNAME + '.sql'):
return os.popen(self.__DUMP_COMMAND + self.__LOGINARGS + self.__ENGINE + ' '.join(
self.__DATABASE_LIST) + ' >> ' + self.__BACKUP_DIR + '/' + self.__PROJECTNAME + '/' + str(
self.__YESTERDAY) + '-' + self.__PROJECTNAME + '.sql')
else:
sys.stderr.write('Backup File [' + str(self.__YESTERDAY) + '-' + self.__PROJECTNAME + '.sql] already exists.\n')
def dumpDatabaseBinlog(self):#通过copy2() 将需要备份的binlog日志复制到指定备份目录
if not os.path.isfile(self.__BACKUP_DIR + '/' + self.__PROJECTNAME + '/' + str(self.__YESTERDAY) + '-' + os.path.split(self.__getBinlogPath())[1]):
from shutil import copy2
try:
copy2(self.__getBinlogPath(),self.__BACKUP_DIR + '/' + self.__PROJECTNAME + '/' + str(self.__YESTERDAY) + '-' + os.path.split(self.__getBinlogPath())[1])
except BaseException,e:
sys.stderr.write(str(e))
else:
sys.stderr.write('Binlog File [' + str(self.__YESTERDAY) + '-' + os.path.split(self.__getBinlogPath())[1] + '] already exists\n' )
def checkDatabaseArgs(self): #对一些必要条件进行检查
__rv = 0
if not os.path.isdir(self.__MysqL_BASE_DIR): #检查指定的MysqL安装目录是否存在
sys.stderr.write('MysqL BASE DIR: [ ' + self.__MysqL_BASE_DIR + ' ] NOT FOUND\n')
__rv += 1
if not os.path.isdir(self.__BACKUP_DIR): #检查指定的备份目录是否存在,如不存在自动创建
sys.stderr.write('BACKUP DIR: [ ' + self.__BACKUP_DIR + '/' + self.__PROJECTNAME + ' ] NOT FOUND,AUTO CREATED\n')
os.makedirs(self.__BACKUP_DIR + '/' + self.__PROJECTNAME)
if not os.path.isfile(self.__MysqL_CONFIG_FILE): #检查MysqL配置文件是否存在
sys.stderr.write('MysqL CONFIG FILE: [' + self.__MysqL_CONFIG_FILE + ' ] NOT FOUND\n')
__rv += 1
if not os.path.isfile(self.__DUMP_COMMAND): #检查备份数据库时使用的MysqLdump命令是否存在
sys.stderr.write('MysqL DUMP COMMAND: [' + self.__DUMP_COMMAND + ' ] NOT FOUND\n')
__rv += 1
if not os.path.isfile(self.__FLUSH_LOG_COMMAND): #检查刷新MysqL binlog日志使用的MysqLadmin命令是否存在
sys.stderr.write('MysqL FLUSH LOG COMMAND: [' + self.__DUMP_COMMAND + ' ] NOT FOUND\n')
__rv += 1
if not self.__DATABASE_LIST: #检查需要备份的数据库列表是否存在
sys.stderr.write('Database List is None \n')
__rv += 1
if __rv: # 判断返回值,由于上述任何一步检查失败,都会导致 __rv 值 +1 ,只要最后__rv != 0就直接退出了。
sys.exit(1)
def crontab(): # 使用字典,来进行相关参数传递,并实例化对象,调用相关方法进行操作
zabbix = {
'baseDir': '/usr/local/MysqL/','backDir': '/backup/','projectName': 'Monitor','dbList': ['zabbix'],'host': 'localhost','port': 3306,'user': 'root','passwd': 'xxxxxxx'
}
monitor = DatabaseArgs(**zabbix)
monitor.dumpDatabasesql()
monitor.dumpDatabaseBinlog()
monitor.flushDatabaseBinlog()
if __name__ == '__main__':
crontab()
# End www.jb51.cc
my.cnf
[client]
port = 3306
socket = /MysqL/var/db.socket
[MysqLd]
socket = /MysqL/var/db.socket
datadir = /MysqL/db/
skip-external-locking = 1
skip-innodb = 0
key_buffer_size = 256M
max_allowed_packet = 10M
table_open_cache = 2048
sort_buffer_size = 4M
read_buffer_size = 4M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
myisam_max_sort_file_size = 1G
myisam_repair_threads = 1
myisam_recover = DEFAULT
thread_cache_size = 32
query_cache_size = 32M
query_cache_min_res_unit = 2k
bulk_insert_buffer_size = 64M
tmp_table_size = 128M
thread_stack = 192K
skip-name-resolve = 1
max_connections = 65500
default-storage-engine = myisam
federated = 0
server-id = 1
slave-skip-errors = all
#log = /var/log/sql_query.log
slow-query-log = 1
slow-query-log-file = /MysqL/log/sql_query_slow.log
long-query-time = 5
log-queries-not-using-indexes = 1
log-slow-admin-statements = 1
log-bin = /MysqL/var/log/binlog/bin-log
log-error = /MysqL/var/log/MysqL.err
master-info-file = /MysqL/var/log/master.info
relay-log = /MysqL/var/log/relay-bin/relay-bin
relay-log-index = /MysqL/var/log/relay-bin/relay-bin.index
relay-log-info-file = /MysqL/var/log/relay-bin/relay-bin.info
binlog_cache_size = 8M
binlog_format = MIXED
max_binlog_cache_size = 20M
max_binlog_size = 1G
binlog-ignore-db = MysqL
binlog-ignore-db = performance_schema
binlog-ignore-db = information_schema
replicate-ignore-db = MysqL
replicate-ignore-db = performance_schema
replicate-ignore-db = information_schema
innodb_data_home_dir = /MysqL/ibdata/
innodb_data_file_path = ibdata:156M:autoextend
innodb_log_group_home_dir = /MysqL/ibdata/
log-slave-updates = 0
back_log = 512
transaction_isolation = READ-COMMITTED
max_heap_table_size = 246M
interactive_timeout = 120
wait_timeout = 120
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 512M
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 16M
innodb_log_file_size = 128M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 1
innodb_open_file = 327500
open_files_limit = 327500
[MysqLdump]
quick = 1
max_allowed_packet = 50M
[MysqL]
auto-rehash = 1
socket = /MysqL/var/db.socket
safe-updates = 0
[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M
[MysqLhotcopy]
interactive-timeout = 100
# End www.jb51.cc
最终生成的备份目录结构是这样的
[root@zabbix backup]# find ./
./
./Monitor
./Monitor/2013-03-16-bin-log.000008
./Monitor/2013-03-14-bin-log.000006
./Monitor/2013-03-16-Monitor.sql
./Monitor/2013-03-15-Monitor.sql
./Monitor/2013-03-15-bin-log.000007
./Monitor/2013-03-14-Monitor.sql
~END~
# End www.jb51.cc