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XCCDF
Guide to the Secure Configuration of Alibaba Cloud Linux 2
Services
Network Time Protocol
Specify a Remote NTP Server
Specify a Remote NTP Server
An XCCDF Rule
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Specify a Remote NTP Server
Medium Severity
Depending on specific functional requirements of a concrete production environment, the Alibaba Cloud Linux 2 system can be configured to utilize the services of the
chronyd
NTP daemon (the default), or services of the
ntpd
NTP daemon. Refer to
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-configuring_ntp_using_the_chrony_suite
for more detailed comparison of the features of both of the choices, and for further guidance how to choose between the two NTP daemons.
To specify a remote NTP server for time synchronization, perform the following:
if the system is configured to use the
chronyd
as the NTP daemon (the default), edit the file
/etc/chrony.conf
as follows,
if the system is configured to use the
ntpd
as the NTP daemon, edit the file
/etc/ntp.conf
as documented below.
Add or correct the following lines, substituting the IP or hostname of a remote NTP server for
ntpserver
:
server
ntpserver
This instructs the NTP software to contact that remote server to obtain time data.