1 はじめに

MySQLを操作していると、時々 ## しか含まれないことがわかりました。 # が作成されました %のアカウントはlocalhost経由で接続できますが、接続できない場合があります。オンライン検索では満足のいく答えが見つかりません。手動で試してみます。

mysql ビデオ チュートリアル>>

mysql# を実行するときに参照します。 ## command,-hパラメータにはlocalhostまたはIPが入力されます。2 つの接続方法の違いは次のとおりです-h パラメータは localhost

#-h

localhostの場合、実際にはsocketが接続に使用されます (デフォルトの接続方法)。例は次のとおりです。

[mysql@mysql-test-83 ~]$ /usr/local/mysql57/bin/mysql -utest_user -p -hlocalhost Enter password: ========= 省略 =========== mysql> status /usr/local/mysql57/bin/mysql Ver 14.14 Distrib 5.7.21, for linux-glibc2.12 (x86_64) using EditLine wrapper Connection id: 9 Current database: Current user: test_user@localhost SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.7.21-log MySQL Community Server (GPL) Protocol version: 10 Connection: Localhost via UNIX socket

xx@localhost、接続方法はLocalhost via UNIX ソケット#であることがわかります。##-h でパラメータは IP

パラメータが

の場合、実際にはTCPは例は次のとおりです

[mysql@mysql-test-83 ~]$ /usr/local/mysql57/bin/mysql -utest_user -p -h127.0.0.1 Enter password: ========= 省略 =========== mysql> status -------------- /usr/local/mysql57/bin/mysql Ver 14.14 Distrib 5.7.21, for linux-glibc2.12 (x86_64) using EditLine wrapper Connection id: 11 Current database: Current user: test_user@127.0.0.1 SSL: Cipher in use is DHE-RSA-AES256-SHA Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.7.21-log MySQL Community Server (GPL) Protocol version: 10 Connection: 127.0.0.1 via TCP/IP Server characterset: utf8

で、接続方法が # であることがわかります。 ##TCP/IP3 バージョン間の違いテスト方法は、接続できるかどうかを確認することです。テストプロセスを見たくない場合は、次の方法を使用できます。最後までスクロールして結論を確認してください

mysql> select version(); +-----------+ | version() | +-----------+ | 8.0.11 | +-----------+ 1 row in set (0.00 sec) mysql> create user test_user@'%' identified by 'test_user'; Query OK, 0 rows affected (0.07 sec)

[root@mysql-test-72 ~]# /usr/local/mysql80/bin/mysql -utest_user -p -hlocalhost Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 9 Server version: 8.0.11 MySQL Community Server - GPL ========= 省略 =========== mysql> status -------------- /usr/local/mysql80/bin/mysql Ver 8.0.11 for linux-glibc2.12 on x86_64 (MySQL Community Server - GPL) Connection id: 9 Current database: Current user: test_user@localhost SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 8.0.11 MySQL Community Server - GPL Protocol version: 10 Connection: Localhost via UNIX socket ...

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[root@mysql-test-72 ~]# /usr/local/mysql80/bin/mysql -utest_user -p -h127.0.0.1 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.11 MySQL Community Server - GPL ========= 省略 =========== mysql> status -------------- /usr/local/mysql80/bin/mysql Ver 8.0.11 for linux-glibc2.12 on x86_64 (MySQL Community Server - GPL) Connection id: 8 Current database: Current user: test_user@127.0.0.1 SSL: Cipher in use is DHE-RSA-AES128-GCM-SHA256 Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 8.0.11 MySQL Community Server - GPL Protocol version: 10 Connection: 127.0.0.1 via TCP/IP

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MySQL

8.0

localhost3.2 MySQL を含む%が表示されます。 5.7Create % user

db83-3306>>create user test_user@'%' identified by 'test_user'; Query OK, 0 rows affected (0.00 sec)

[mysql@mysql-test-83 ~]$ /usr/local/mysql57/bin/mysql -utest_user -p -hlocalhost ========= 省略 =========== mysql> status /usr/local/mysql57/bin/mysql Ver 14.14 Distrib 5.7.21, for linux-glibc2.12 (x86_64) using EditLine wrapper Connection id: 9 Current database: Current user: test_user@localhost SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.7.21-log MySQL Community Server (GPL) Protocol version: 10 Connection: Localhost via UNIX socket ....

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[mysql@mysql-test-83 ~]$ /usr/local/mysql57/bin/mysql -utest_user -p -h127.0.0.1 Enter password: ========= 省略 =========== mysql> status -------------- /usr/local/mysql57/bin/mysql Ver 14.14 Distrib 5.7.21, for linux-glibc2.12 (x86_64) using EditLine wrapper Connection id: 11 Current database: Current user: test_user@127.0.0.1 SSL: Cipher in use is DHE-RSA-AES256-SHA Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.7.21-log MySQL Community Server (GPL) Protocol version: 10 Connection: 127.0.0.1 via TCP/IP Server characterset: utf8 ...

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5.7

MySQL

%localhost3.3 MySQL 5.6を含むユーザー

db83-3306>>select version(); +------------+ | version() | +------------+ | 5.6.10-log | +------------+ 1 row in set (0.00 sec) db83-3306>>create user test_user@'%' identified by 'test_user'; Query OK, 0 rows affected (0.00 sec)

[mysql@mysql-test-83 ~]$ /usr/local/mysql57/bin/mysql -utest_user -p -hlocalhost Enter password: ERROR 1045 (28000): Access denied for user 'test_user'@'localhost' (using password: YES)

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[mysql@mysql-test-83 ~]$ /usr/local/mysql57/bin/mysql -utest_user -p -h127.0.0.1 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 3 Server version: 5.6.10-log MySQL Community Server (GPL) ========= 省略 =========== mysql> status -------------- /usr/local/mysql57/bin/mysql Ver 14.14 Distrib 5.7.21, for linux-glibc2.12 (x86_64) using EditLine wrapper Connection id: 3 Current database: Current user: test_user@127.0.0.1 SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.6.10-log MySQL Community Server (GPL) Protocol version: 10 Connection: 127.0.0.1 via TCP/IP ...... --------------

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MySQL 5.6

%

localhost## が含まれていないことを示しています。#3.4 MySQL 5.1ユーザーの作成

mysql> select version(); +-----------+ | version() | +-----------+ | 5.1.73 | +-----------+ 1 row in set (0.00 sec) mysql> create user test_user@'%' identified by 'test_user'; Query OK, 0 rows affected (0.00 sec)

[root@chengqm ~]# mysql -utest_user -p Enter password: ERROR 1045 (28000): Access denied for user 'test_user'@'localhost' (using password: YES)

IPを使用してログイン

[root@chengqm ~]# mysql -utest_user -p -h127.0.0.1 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4901339 Server version: 5.1.73 Source distribution ========= 省略 =========== mysql> status -------------- mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1 Connection id: 4901339 Current database: Current user: test_user@127.0.0.1 SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.1.73 Source distribution Protocol version: 10 Connection: 127.0.0.1 via TCP/IP

結果Display

のバージョンには

3.5 MariaDB 10.3Create user

db83-3306>>select version(); +---------------------+ | version() | +---------------------+ | 10.3.11-MariaDB-log | +---------------------+ 1 row in set (0.000 sec) db83-3306>>create user test_user@'%' identified by 'test_user'; Query OK, 0 rows affected (0.001 sec)

[mysql@mysql-test-83 ~]$ /usr/local/mariadb/bin/mysql -utest_user -p -hlocalhost Enter password: ERROR 1045 (28000): Access denied for user 'test_user'@'localhost' (using password: YES)

[mysql@mysql-test-83 ~]$ /usr/local/mariadb/bin/mysql -utest_user -p -h127.0.0.1 Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 12 Server version: 10.3.11-MariaDB-log MariaDB Server ========= 省略 =========== MariaDB [(none)]> status -------------- /usr/local/mariadb/bin/mysql Ver 15.1 Distrib 10.3.11-MariaDB, for Linux (x86_64) using readline 5.1 Connection id: 12 Current database: Current user: test_user@127.0.0.1 SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server: MariaDB Server version: 10.3.11-MariaDB-log MariaDB Server Protocol version: 10 Connection: 127.0.0.1 via TCP/IP

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MariaDB 10.3

%

localhost

4 結論バージョン

ユーザーの