System V init命令 systemctl命令 作用
    service foo start systemctl start foo.service 启动服务
    servicefoo restart systemctl restart foo.service 重启服务
    service foo stop systemctl stop foo.service 停止服务
    service foo reload systemctl reload foo.service 重新加载配置文件（不终止服务）
    service foo status systemctl status foo.service 查看服务状态
    chkconfig foo on systemctl enable foo.service 开机自动启动
    chkconfig foo off systemctl disable foo.service 开机不自动启动
    chkconfig foo systemctl is-enabled foo.service 查看特定服务是否为开机自动启动
    chkconfig —list systemctl list-unit-files —type=service 查看各个级别下服务的启动与禁用情况
    systemctl is-active foo.service 查看特定服务是否正在运行

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    参考链接：
    https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-unitshttps://docs.fedoraproject.org/en-US/quick-docs/understanding-and-administering-systemd/index.html
    https://fedoraproject.org/wiki/SysVinit_to_Systemd_Cheatsheet
    https://wiki.ubuntu.com/SystemdForUpstartUsers
    https://wiki.archlinux.org/title/Improving_performance/Boot_process#Using_systemd-analyze

    init vs systemd
    https://wiki.cdot.senecacollege.ca/wiki/Init_vs_systemd