在为 Kubuntu 19.10 全新安装 mysql-server-8.0 后，我从命令提示符输入了 mysql_secure_installation。并按照说明进行操作。
以下是我的流程的输出：
Securing the MySQL server deployment.
Connecting to MySQL using a blank password.
The 'validate_password' component is installed on the server.
The subsequent steps will run with the existing configuration
of the component.
Please set the password for root here.
New password:
Re-enter new password:
Estimated strength of the password: 0
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y
Success.
Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : n
... skipping.
By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y
- Dropping test database...
Success.
- Removing privileges on test database...
Success.
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
Success.
All done!
然后
da@n53sm:~$ mysql -u root -p
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'
我不明白到底哪里出了问题？
以下是错误日志的输出：
da@n53sm:~$ tail -f /var/log/mysql/error.log
2020-01-21T07:27:02.077614Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.18-0ubuntu0.19.10.1) (Ubuntu).
2020-01-21T07:27:03.414829Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18-0ubuntu0.19.10.1) starting as process 2774
2020-01-21T07:27:03.966655Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-01-21T07:27:03.973831Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/tmp' in the path is accessible to all OS users. Consider choosing a different directory.
2020-01-21T07:27:04.010871Z 6 [System] [MY-013172] [Server] Received SHUTDOWN from user boot. Shutting down mysqld (Version: 8.0.18-0ubuntu0.19.10.1).
2020-01-21T07:27:04.994403Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.18-0ubuntu0.19.10.1) (Ubuntu).
2020-01-21T07:27:09.363280Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18-0ubuntu0.19.10.1) starting as process 2939
2020-01-21T07:27:09.847387Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-01-21T07:27:09.872284Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.18-0ubuntu0.19.10.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu).
2020-01-21T07:27:10.013629Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/run/mysqld/mysqlx.sock' bind-address: '::' port: 33060
重新启动mysql后，日志变为：
2020-01-21T07:49:41.567105Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.18-0ubuntu0.19.10.1) (Ubuntu).
2020-01-21T07:49:41.941350Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18-0ubuntu0.19.10.1) starting as process 5006
2020-01-21T07:49:42.479793Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-01-21T07:49:42.501480Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.18-0ubuntu0.19.10.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu).
2020-01-21T07:49:42.591749Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/run/mysqld/mysqlx.sock' bind-address: '::' port: 33060
答案1
答案就在您的输出日志中。
Insecure configuration for --pid-file: Location '/tmp' in the path is accessible to all OS users. Consider choosing a different directory
将 MySQL 的配置更改为位置等于用户文件夹内的文件夹（即 ~/tmp 或 /root/tmp）。
请注意，此故障后会收到关闭信号。这表明上述函数是导致 MySQL 关闭的原因。
编辑：我看到 MySQL 正在抱怨自签名证书，并且通过 SSL 初始化失败可能是根本原因。
參閱此链接来自 StackOverflow