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

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():

    try:

        server_ip = get_host_ip();

        server_name= str.strip(get_host_name());

        server_system=platform.system();

        linux_dis =platform.linux_distribution();

        os_version =''

        os_version = ' '.join(linux_dis)

        os_bitinfo = platform.architecture()

        os_bit =os_bitinfo[0][0:2]

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

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

        cpu_core =  multiprocessing.cpu_count();

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

        memory = get_physical_memory()

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

        dbcon = mysql.connector.connect(

            host='127.0.0.1',

            user='root',

            passwd='123456',

            database='mysql'

        )

        cursor = dbcon.cursor()

        sql_tex =( "insert into db_server_info("

                   "factory_cd      ,"

                   "server_name     ,"

                   "server_ip       ,"

                   "server_type     ,"

                   "server_system   ,"

                   "is_production   ,"

                   "os_version      ,"

                   "os_patch        ,"

                   "os_bit          ,"

                   "processors      ,"

                   "cpu_slot        ,"

                   "processors_core ,"

                   "memory          ,"

                   "disk_space      ,"

                   "server_purpose)  "

                   "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)")

        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":''}

        cursor.execute('truncate table db_server_info')

        dbcon.commit()

        cursor.execute(sql_tex, data)

        dbcon.commit()

    except mysql.connector.Error as e:

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

    finally:

        cursor.close;

        dbcon.close;

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();

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

| current_user() |

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

| root@localhost |

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

1 row in set (0.00 sec)

mysql> show grants for root@'localhost';

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

| Grants for root@localhost                                                                                                 |

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

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

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

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

2 rows in set (0.00 sec)

mysql> show grants for root@'127.0.0.1';

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

| Grants for root@127.0.0.1                                           |

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

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

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

1 row in set (0.00 sec)

mysql> 

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)”