Install the time chrony

 https://shazi.info/chrony-%E7%B3%BB%E7%B5%B1%E6%A0%A1%E6%99%82%E5%B7%A5%E5%85%B7%EF%BC%8C%E6%8A%8A%E9%81%8E%E6%99%82%E7%9A%84-ntpdate-%E4%B8%9F%E6%8E%89%E5%90%A7/

 yum install chrony -y

 service chronyd start

chkconfig chronyd on

 vim /etc/chrony.conf

service chronyd restart

https://xyz.cinc.biz/2016/09/centos-7-chrony.html

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-configuring_ntp_using_the_chrony_suite#sect-differences_between_ntpd_and_chronyd

Cenot7 systemd command

https://www.3chy2.com.tw/3c%E8%B3%87%E8%A8%8A/linux-systemd-%E8%A9%B3%E7%B4%B0%E4%BB%8B%E7%B4%B9-unit%E3%80%81unit-file%E3%80%81systemctl%E3%80%81target/

Linux Systemd 詳細介紹: Unit、Unit File、Systemctl、Target

2020-09-01

Systemd

簡介

CentOS 7 使用 Systemd 替換了SysV

Ubuntu 從 15.04 開始使用 Systemd

Systemd 是 Linux 系統工具，用來啟動守護進程，已成為大多數發行版的標準配置.....

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ref:

https://codingbee.net/rhcsa/rhcsa-the-target-unit

https://www.tecmint.com/list-all-running-services-under-systemd-in-linux/

nfs: https://codingbee.net/rhcsa/nfs-how-to-set-up-an-nfs-client-on-centos-7

https://www.systutorials.com/docs/linux/man/7-nfs.systemd/

https://fossies.org/linux/nfs-utils/systemd/var-lib-nfs-rpc_pipefs.mount

sourcecode

https://fossies.org/linux/nfs-utils/systemd/var-lib-nfs-rpc_pipefs.mount