我的mysql服务器停止后无法启动
命令使用：

sudo /etc/init.d/mysql restart

错误：
重新启动mysql（通过systemctl）：mysql.service的作业失败，因为控制进程退出并返回错误代码。
已使用systemctl status mysql.service和journalctl -xe检查状态，未获得任何帮助。
错误日志：

2020-06-23T00:11:48.882919Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use

• -explicit_defaults_for_timestamp服务器选项（有关详细信息，请参见文档）。

2020-06-23T00:11:48.883135Z 0 [Warning] Can't create test file /u1/mysql/sad-swh.lower-test

2020-06-23T00:11:48.883185Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.30-0ubuntu0.18.04.1) starting as process 28411 ...

2020-06-23T00:11:48.886131Z 0 [Warning] Can't create test file /u1/mysql/sad-swh.lower-test

2020-06-23T00:11:48.886148Z 0 [Warning] Can't create test file /u1/mysql/sad-swh.lower-test

2020-06-23T00:11:48.889591Z 0 [Note] InnoDB: PUNCH HOLE support available

2020-06-23T00:11:48.889612Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2020-06-23T00:11:48.889616Z 0 [Note] InnoDB: Uses event mutexes

2020-06-23T00:11:48.889620Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier

2020-06-23T00:11:48.889623Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.11

2020-06-23T00:11:48.889627Z 0 [Note] InnoDB: Using Linux native AIO

2020-06-23T00:11:48.889890Z 0 [Note] InnoDB: Number of pools: 1

2020-06-23T00:11:48.890022Z 0 [Note] InnoDB: Using CPU crc32 instructions

2020-06-23T00:11:48.892207Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M

2020-06-23T00:11:48.900818Z 0 [Note] InnoDB: Completed initialization of buffer pool

2020-06-23T00:11:48.903535Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be

已更改。请参见setpriority（）的手册页。

2020-06-23T00:11:48.913543Z 0 [Note] InnoDB: The first innodb_system data file 'ibdata1' did not exist. A new tablespace will

被创造!

2020-06-23T00:11:48.913858Z 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.

2020-06-23T00:11:48.913871Z 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.

2020-06-23T00:11:48.913878Z 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.

2020-06-23T00:11:48.913883Z 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.

2020-06-23T00:11:48.913889Z 0 [ERROR] InnoDB: Cannot open datafile './ibdata1'

2020-06-23T00:11:48.913896Z 0 [ERROR] InnoDB: Could not open or create the system tablespace. If you tried to add new data files to

系统表空间，并且在此失败，您现在应该将my. cnf中的innodb_data_file_path编辑回原来的位置，并删除在此失败尝试中创建的新ibdata文件InnoDB。InnoDB只将这些文件写满零，但尚未以任何方式使用它们。但要小心：不要删除包含您的宝贵数据的旧数据文件!

2020-06-23T00:11:48.913903Z 0 [ERROR] InnoDB: InnoDB Database creation was aborted with error Cannot open a file. You may need to

在尝试再次启动之前删除ibdata1文件。

2020-06-23T00:11:49.514733Z 0 [ERROR] Plugin 'InnoDB' init function returned error.

2020-06-23T00:11:49.514763Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

2020-06-23T00:11:49.514773Z 0 [ERROR] Failed to initialize builtin plugins.

2020-06-23T00:11:49.514779Z 0 [ERROR] Aborting

2020-06-23T00:11:49.514817Z 0 [Note] Binlog end

2020-06-23T00:11:49.514889Z 0 [Note] Shutting down plugin 'CSV'

2020-06-23T00:11:49.515486Z 0 [Note] /usr/sbin/mysqld: Shutdown complete

● mysql.service - MySQL Community Server Loaded: loaded (/lib/systemd/system/mysql.service;
 enabled;
 vendor preset: enabled) Active: failed (Result: exit-code) since Mon 2020-06-22 16:07:36 CST;
 9min ago Process: 26756 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid (code=exited, status=1/FAILURE) Process: 26737 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS) Main PID: 18936 (code=exited, status=0/SUCCESS)