mysql 設置skip_name_resolve參數 日誌 [Warning] 'user' entry 'root@localhost' ignored in...

【環境介紹】
  系統環境：Red Hat Enterprise Linux 7 + 5.7.25-enterprise-commercial-advanced-log MySQL Enterprise Server - Advanced Edition (Commercial)

【狀況描述】

 在安裝完數據庫以後，查看日誌出現多個Warning信息：

2019-04-26T17:28:33.605994+08:00 0 [Note] Server socket created on IP: '::'.
2019-04-26T17:28:33.652894+08:00 0 [Warning] 'user' entry 'root@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.653069+08:00 0 [Warning] 'user' entry 'mysql.session@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.653099+08:00 0 [Warning] 'user' entry 'mysql.sys@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.653630+08:00 0 [Warning] 'db' entry 'performance_schema mysql.session@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.653648+08:00 0 [Warning] 'db' entry 'sys mysql.sys@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.654222+08:00 0 [Warning] 'proxies_priv' entry '@ root@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.707215+08:00 0 [Warning] 'tables_priv' entry 'user mysql.session@localhost' ignored in --skip-name-resolve mode.
2019-04-26T17:28:33.707301+08:00 0 [Warning] 'tables_priv' entry 'sys_config mysql.sys@localhost' ignored in --skip-name-resolve mode.

【狀況分析】

skip_name_resolve參數說明：

此變量是根據--skip-name-resolve選項的值設置的。 若是是OFF，mysqld檢查客戶端鏈接時解析主機名。 若是它是ON，mysqld只使用IP號碼;
在這種狀況下，受權表中的全部主機列值必須是IP地址或localhost。數據庫驗證主機來源，服務器要執行DNS的正向和反向查找，若是DNS出問題，會堆積起來，最終致使鏈接超時，建議設置該參數。

 查看--skip-name-resolve參數信息：

root@(none) 08:45:14>show variables like 'skip_name_resolve';
+-------------------+-------+
| Variable_name     | Value |
+-------------------+-------+
| skip_name_resolve | ON    |
+-------------------+-------+
1 row in set (0.01 sec)

root@(none) 08:45:38>system cat /etc/my.cnf|grep skip_name_resolve
skip_name_resolve = on
root@(none) 08:45:50>

 查看用戶信息：

root@(none) 08:34:30>select distinct User,Host from mysql.user;
+---------------+-----------+
| User          | Host      |
+---------------+-----------+
| tuan          | %         |
| mysql.session | localhost |
| mysql.sys     | localhost |
| root          | localhost |
+---------------+-----------+
4 rows in set (0.12 sec)

root@(none) 08:43:17>

官方參數信息：

 

 該數據庫是新搭建的，沒有其餘操縱，且初始化時並無報錯，在MOS上面查詢，查看跟類似BUG 23329861 - WARNING ABOUT LOCALHOST WHEN USING SKIP-NAME-RESOLVE

查看該BUG信息，該BUG將在5.7.26進行修復：

描述信息跟BUG一致：

 

 查看官方5.7.26文檔對此BUG的描述：

 

【對數據庫進行升級修復】

  升級過程忽略，查看錯誤日誌信息，已經修復waring：

 

 [Warning] Plugin audit_log reported: 'Audit Log plugin supports a filtering, which has not been installed yet. Audit Log plugin will run in the legacy mode, which will be disabled in the next release.'

爲相應的表及函數沒有建立：

• Linux and Unix: share/audit_log_filter_linux_install.sql
• Windows: share/audit_log_filter_win_install.sql

mysql>SOURCE <path to MySQL base>/share/audit_log_filter_linux_install.sql

mysql> CREATE FUNCTION audit_log_read_bookmark RETURNS STRING SONAME 'audit_log.so';
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE FUNCTION audit_log_read RETURNS STRING SONAME 'audit_log.so';
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE FUNCTION audit_log_encryption_password_set RETURNS INTEGER SONAME 'audit_log.so';
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE FUNCTION audit_log_encryption_password_get RETURNS STRING SONAME 'audit_log.so';
Query OK, 0 rows affected (0.00 sec)