python备份binlog

 mysql备份每天进行一次全备份，服务器故障后，没有binlog的情况下，存在一天的数据丢失情况，所以每一小时或几小时备份binlog到备份服务器。当然，有主从可不备份binlog。

#!/usr/bin/python
#--*-- coding:utf-8 --*--

import os
import time
import logging
from datetime import datetime

# LOG INFO
log='/data/scripts/logs/'
isExists = os.path.exists(log)
if not isExists:
    os.makedirs(log)
logging.basicConfig(level=logging.INFO,
                    format='%(asctime)s: %(levelname)-4s %(message)s',
                    filename= log + 'backup_binlog_' + time.strftime('%Y%m%d_%H%M%S', time.localtime()) + '.log',
                    filemode='w',
                    datefmt='%Y%m%d %X')

def main():
    # get local ip
    ip = os.popen("/sbin/ifconfig | grep 'inet '| grep -v '127.0.0.1'| awk '{print $2}'").read().replace('\n','')

    # 备份开始点
    lastlog = "/data/scripts/lastlog"
    with open(lastlog, 'r') as f:
        bf = f.read()
    f.close()
    # 所有binlog,用于备份,由近到远排序后存到mysqlbin文件
    mysqlbin = "/data/scripts/mysqlbin"
    cmd = "/usr/local/mysql/bin/mysql -e \"show master logs;\" | grep mysql | awk '{print $1}' |sort -r > %s"%(mysqlbin)
    os.system(cmd)
    # 生成新binlog，记录备份位置，此binlog下次备份
    cmd = "/usr/local/mysql/bin/mysql -e \"flush logs;\""
    os.system(cmd) 
    # 备份结束点   
    cmd = "/usr/local/mysql/bin/mysql -e \"show master logs;\" | grep mysql  | tail -1|awk '{print $1}'|awk -F. '{print $2}' > %s"%(lastlog)
    os.system(cmd)
    with open(lastlog, 'r') as f:
        ef = f.read()
    f.close()
    # 此次备份的binlog数量
    num = int(ef) - int(bf)
    binlog = "/data/mysql/"
    path = "/media/dbbackup/" + ip + "/binlogs/"
    isExists = os.path.exists(path)
    logging.info("backup binlog mount: " + str(num))
    if not isExists:
        os.makedirs(path)
    # 删除不需要备份的记录
    cmd = "sed -i ''%d' , $d' %s "%(num + 1,mysqlbin)
    logging.info(cmd)
    os.system(cmd)
    # 开始备份
    f=open(mysqlbin,'r')
    lines = f.readlines()
    for line in lines:
        fname = binlog + line.strip()
        cmd = 'cp ' + fname + ' ' + path
        logging.info(cmd)
        os.system(cmd)
    f.close()

if __name__ == '__main__':
    logging.info('##################################################')
    main()
    logging.info('##################################################')

脚本用到两个临时文件

1、lastlog（上次备份到的日志后几位）初始化如下：

echo 000004 > /data/scripts/lastlog

2、mysqlbin存放当次需要备份的所有binlog文件名