● mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2018-08-31 18:03:37 KST; 9min ago
Process: 6005 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid (code=exited, status=0/SUCCESS)
Process: 5996 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
Main PID: 6007 (mysqld)
Tasks: 30 (limit: 4915)
CGroup: /system.slice/mysql.service
└─6007 /usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.409469Z 0 [Note] Found ca.pem, server-cert.pem and server-key.pem in data directory. Trying to enable SSL support using them.
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.409772Z 0 [Warning] CA certificate ca.pem is self signed.
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.413194Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.413243Z 0 [Note] IPv6 is available.
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.413255Z 0 [Note] - '::' resolves to '::';
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.413294Z 0 [Note] Server socket created on IP: '::'.
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.427078Z 0 [Note] Event Scheduler: Loaded 0 events
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: 2018-08-31T09:03:37.427439Z 0 [Note] /usr/sbin/mysqld: ready for connections.
Aug 31 18:03:37 lenovo-g50-45 mysqld[6005]: Version: '5.7.23-0ubuntu0.18.04.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu)
Aug 31 18:03:37 lenovo-g50-45 systemd[1]: Started MySQL Community Server.
与上述状态一样，当 PC 重新启动时 MySQL 启动良好。但奇怪的是，文件夹中没有任何名为“mysql”的/etc/init.d文件。
启动PC时没有初始化脚本如何启动MySQL？如何将 MySQL 添加到 init.d 文件夹？
您的输出表明 MySQL 服务文件位于
/lib/systemd/system/mysql.service./etc/init.d是遗留的，开发人员已经调整了由 systemd 启动的软件。