【Python维护数据库】备份PgSQL实例下指定的数据库

Postgresql：12.3

Python：2.7.5

利用py脚本备份PgSQL数据库

$ cat db_backup.py 
#!/usr/bin/env python
# -*- coding: utf8 -*-
"""pg_dump备份PgSQL实例下指定数据库zedb"""
import sys,os,time
from datetime import datetime,timedelta,date
import shutil
db_user = 'backup'
#db_pwd = 'xxx'
db_port = '5432'
db_name = 'zedb'
backup_path = '/pgshare/db_dump/'
cmd_path = '/usr/local/pgsql/bin/'
log_path = backup_path + 'log'

# 创建日志函数
def writeLogs(filename,contents):
  f = file(filename,'aw')
  f.write(contents)
  f.close()

today = backup_path + time.strftime('%Y-%m-%d')
fname = today + os.sep + time.strftime('%Y-%m-%d') + '_' + db_name + '.backup'

# 创建备份目录
if not os.path.exists(today):
   Msg = '-'*30 + time.strftime('%Y-%m-%d,%H:%M:%S') + '-'*30 + '\n'
   if(os.mkdir(today)) == None:
       Msg += '** 成功创建备份目录： ' + today + '\n\n'
       writeLogs(log_path,Msg)
   else:
       Msg += '!! 创建备份目录： ' + today + '失败，请检查目录是否可写！\n\n'
       writeLogs(log_path,Msg)
       sys.exit()

# 备份数据库
cmd_dump = "%spg_dump -h localhost  -p %s -U %s -F c -b -v -f %s %s" % \
               (cmd_path,db_port,db_user,fname,db_name)
# 执行备份命令
if os.system(cmd_dump) == 0:
   writeLogs(log_path,'数据备份为： ' + fname + '\n')
else:
   writeLogs(log_path,'数据备份失败！\n')
##清理历史备份
def is_valid_date(str):
    '''判断是否是一个有效的日期字符串'''
    try:
        time.strptime(str, "%Y-%m-%d")
        return True
    except:
        return False
try:
    define_date = (date.today() + timedelta(days=-7)).strftime("%Y-%m-%d")
    print("!!!" + define_date + "之前的备份将进行清理!!!")
    for f in os.listdir(backup_path):
        if is_valid_date(f):
            if f < define_date:
                rm_f = backup_path + f
                print(rm_f)
                writeLogs(log_path, '删除过期的日期目录： ' + rm_f + '\n')
                shutil.rmtree(rm_f)
except OSError as err:
    print(err)

标签：-%,log,Python,数据库,db,PgSQL,path,backup,备份
来源： https://www.cnblogs.com/helon/p/16107729.html