mysqld.log 中没有临时密码

Question

我用过mysql 5.7.16社区和centos 7。

我正在关注tutorial安装mysql的视频：

1. wget http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
2. yum localinstall dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
3. yum repolist 已启用 | grep "mysql.-community."
4. yum install mysql-community-server
5. 服务 mysqld 启动

启动 mysql 后，我可以看到状态为活动（运行）service mysqld status。

但我无法通过以下方式获得任何信息：grep 'temporary password' /var/log/mysqld.log

msyqld.log（忽略正常日志）：

[Warning] InnoDB: Cannot open table mysql/plugin from the internal data dictionary of InnoDB though the .frm file for the table exists.
mysqld: Table 'mysql.plugin' doesn't exist

[ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

[Warning] InnoDB: Cannot open table mysql/gtid_executed from the internal data dictionary of InnoDB though the .frm file for the table exists.
mysqld: Table 'mysql.gtid_executed' doesn't exist

[Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.

[Warning] InnoDB: Cannot open table mysql/server_cost from the internal data dictionary of InnoDB though the .frm file for the table exists.

[Warning] Failed to open optimizer cost constant tables

[Warning] InnoDB: Cannot open table mysql/time_zone_leap_second from the internal data dictionary of InnoDB though the .frm file for the table exists.

[Warning] Can't open and lock time zone table: Table 'mysql.time_zone_leap_second' doesn't exist trying to live without them

[Warning] InnoDB: Cannot open table mysql/servers from the internal data dictionary of InnoDB though the .frm file for the table exists.

[ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist

感谢任何帮助！

Answer 1

我只是重启了mysql，搜索了一下：

service mysqld start

grep 'temporary password' /var/log/mysqld.log

显示默认密码。

Answer 2

如果没有密码，别担心。 去做吧。

sudo mysql_secure_installation

没有密码，直接回车即可。

Answer 3

我想通了。

1. 我安装 centos 7 时选择了 mysql，mysql 版本是 5.5。
2. 通过以下方式将其删除：yum remove mysql-serverl。
3. 按照本教程安装 5.7.16。
4. 有这些错误。
5. yum 删除 mysql-community-server，重新安装 5.7。
6. 仍然有这些错误。
7. yum 删除 mysql-community-server，但删除目录 /var/lib/mysql。
8. 然后重新安装，就可以了。

关键是需要手动删除/var/lib/mysql。