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00 grep --color=auto mysqlroot@VM_9_196_centos ~# root@VM_9_196_centos ~# service mysqld startRedirecting to /bin/systemctl start mysqld.serviceFailed to issue method call: Unit mysqld.service failed to load: No such file or directory.root@VM_9_196_centos ~# 安装的其他服务也是同样的原因启动报错:Redirecting to /bin/systemctl start XXX.serviceFailed to issue method call: Unit XXX.service failed to load: No such file or directory.求解~相似问题