/etc/systemd/system/mysqld.service
[Unit]
Description=MySQL Server
Documentation=man:mysqld(8)
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
[Service]
User=root
Group=root
ExecStart=/app/mysql/bin/mysqld --defaults-file=/etc/my.cnf
LimitNOFILE=5000
然后就可以：systemctl start mysqld