(28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)

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在一台测试服务器测试Python脚本时，执行Python脚本时报如下错误：

主要错误信息为“operation the sql fail!1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)”。部分测试脚本如下所示，如下所，mysql.connector.connect的host为127.0.0.1 其它账号信息做了脱敏处理.

def record_server_info():

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    try:

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        server_ip = get_host_ip();

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        server_name= str.strip(get_host_name());

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        server_system=platform.system();

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        linux_dis =platform.linux_distribution();

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        os_version =''

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        os_version = ' '.join(linux_dis)

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        os_bitinfo = platform.architecture()

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        os_bit =os_bitinfo[0][0:2]

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        processor = str.strip(commands.getoutput("cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c"))

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        cpu_slot= commands.getoutput("cat /proc/cpuinfo | grep 'model name' | sort | uniq | wc -l");

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        cpu_core =  multiprocessing.cpu_count();

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        processor_core =int(cpu_core)/int(cpu_slot);

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        memory = get_physical_memory()

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        disk_space = get_disk_info()["capacity"]/1024/1024;

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        dbcon = mysql.connector.connect(

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            host='127.0.0.1',

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            user='root',

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            passwd='123456',

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            database='mysql'

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        cursor = dbcon.cursor()

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        sql_tex =( "insert into db_server_info("

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                   "factory_cd      ,"

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                   "server_name     ,"

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                   "server_ip       ,"

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                   "server_type     ,"

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                   "server_system   ,"

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                   "is_production   ,"

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                   "os_version      ,"

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                   "os_patch        ,"

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                   "os_bit          ,"

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                   "processors      ,"

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                   "cpu_slot        ,"

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                   "processors_core ,"

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                   "memory          ,"

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                   "disk_space      ,"

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                   "server_purpose)  "

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                   "values(%(factory_cd)s,%(server_name)s,%(server_ip)s,%(server_type)s,%(server_system)s,%(is_production)s,%(os_version)s,%(os_patch)s,%(os_bit)s,%(processors)s,%(cpu_slot)s,%(processors_core)s,%(memory)s,%(disk_space)s,%(server_purpose)s)")

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        data={'factory_cd':factory_cd, 'server_name':server_name, 'server_ip':server_ip,"server_type":server_type,"server_system":server_system,"is_production":is_productin,"os_version":os_version, "os_patch":'',"os_bit":int(os_bit), "processors":processor,"cpu_slot":cpu_slot, "processors_core":processor_core,"memory":memory,"disk_space":disk_space,"server_purpose":''}

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        cursor.execute('truncate table db_server_info')

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        dbcon.commit()

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        cursor.execute(sql_tex, data)

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        dbcon.commit()

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    except mysql.connector.Error as e:

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        print('operation the sql fail!{0}'.format(e))

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    finally:

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        cursor.close;

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        dbcon.close;

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mysql -u root -p 测试登录MySQ发现没有问题，但是一检查发现，如果不指定host的情况下，当前用户为root@localhost，而root@'127.0.0.1'的密码为空。

mysql> select current_user();

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+----------------+

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| current_user() |

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+----------------+

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| root@localhost |

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+----------------+

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1 row in set (0.00 sec)

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mysql> show grants for root@'localhost';

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+---------------------------------------------------------------------------------------------------------------------------+

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| Grants for root@localhost                                                                                                 |

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+---------------------------------------------------------------------------------------------------------------------------+

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| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*9B67EF98D94F2B81011D6D2CEDE4' WITH GRANT OPTION|

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| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION                                                              |

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+---------------------------------------------------------------------------------------------------------------------------+

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2 rows in set (0.00 sec)

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mysql> show grants for root@'127.0.0.1';

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+---------------------------------------------------------------------+

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| Grants for root@127.0.0.1                                           |

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+---------------------------------------------------------------------+

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| GRANT ALL PRIVILEGES ON *.* TO 'root'@'127.0.0.1' WITH GRANT OPTION |

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+---------------------------------------------------------------------+

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1 row in set (0.00 sec)

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mysql>

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立即检查my.cnf的配置，发现可能某次测试时，设置了参数 skip-name-resolve，后面忘记取消了。由于启动mysqld时使用了'--skip-name-resolve'参数，此种情况下由于不做域名解析，127.0.0.1和localhost对mysql数据库来讲，是不同的主机，而root@'127.0.0.1'为空密码，所以Python脚本执行时，访问MySQL报错“(28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)”