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我已在我的测试服务器上将 MySQL 8.0.3 更新为 8.0.4。但是，它不会启动该服务。

LOG的附加信息：

2018-01-24T04:32:26.996977Z 0 [System] [MY-010116] /usr/sbin/mysqld (mysqld 8.0.4-rc-log) starting as process 12406 ...
2018-01-24T04:32:27.444234Z 1 [ERROR] [MY-011096] No data dictionary version number found.
2018-01-24T04:32:27.444725Z 0 [ERROR] [MY-010020] Data Dictionary initialization failed.
2018-01-24T04:32:27.444802Z 0 [ERROR] [MY-010119] Aborting
2018-01-24T04:32:28.806928Z 0 [System] [MY-010910] /usr/sbin/mysqld: Shutdown complete.

我也尝试运行 mysqld_safe 并抛出以下内容：

2018-01-24T04: 25: 33.852181Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2018-01-24T04: 25: 33.857404Z mysqld_safe Directory '/var/run/mysqld' for UNIX socket file do not exists.

该目录不存在，所以我继续创建它：

sudo mkdir -p /var/run/mysqld
sudo chown mysql: mysql /var/run/mysqld
sudo mysqld_safe

他在控制台上抛出以下内容：

2018-01-24T04: 27: 29.816902Z mysqld_safe 记录到“/var/log/mysql/error.log”。2018-01-24T04: 27: 29.870025Z mysqld_safe 使用来自/var/lib/mysql nohup/usr/sbin/mysqld--basedir=/usr--datadir=/var/lib/mysql--plugin-的数据库启动mysqld守护进程dir=/usr/lib/mysql/plugin--user=mysql--log-error=/var/log/mysql/error.log--pid-file=/var/run/mysqld/mysqld.pid--socket = /var/run/mysqld/mysqld.sock --port = 3309

我再次开始启动服务并扔给我：

Job for mysql.service failed because of the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.

我搜索日志，出现以下内容：

2018-01-24T04: 30: 11.601843Z 0 [System] [MY-010116] /usr/sbin/mysqld (mysqld 8.0.4-rc-log) starting as process 9140 ...
2018-01-24T04: 30: 12.001705Z 1 [ERROR] [MY-011096] No data dictionary version number found.
2018-01-24T04: 30: 12.002121Z 0 [ERROR] [MY-010020] Data Dictionary initialization failed.
2018-01-24T04: 30: 12.002232Z 0 [ERROR] [MY-010119] Aborting

我该怎么做才能启动服务？我已经查看了 /var/lib/ mysql 目录并且有数据库。

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1 回答 1

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降级到 8.0.3 不起作用，因为 mysqld 拒绝启动：

2018-02-22T02:41:16.614370Z 1 [ERROR] InnoDB: Unsupported redo log format. The redo log was created with MySQL 8.0.4. Please follow the instructions at http://dev.mysql.com/doc/refman/8.0/en/upgrading-downgrading.html
2018-02-22T02:41:16.614425Z 1 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2018-02-22T02:41:17.215253Z 1 [ERROR] Failed to initialize DD Storage Engine
2018-02-22T02:41:17.216179Z 0 [ERROR] Data Dictionary initialization failed.
2018-02-22T02:41:17.216216Z 0 [ERROR] Aborting

/var/lib/mysql我设法通过首先备份数据目录（以防接下来的任何步骤破坏任何东西）来取回我的数据，然后在（参见文档innodb_force_recovery = 6）的[mysqld]部分中进行设置，启动 mysqld 然后使用. 之后我建立了一个新的 mysql 服务器并在那里导入了转储。/etc/mysql/my.cnfmysqldump

于 2018-02-22T03:01:20.293 回答