Can’t find host ntp1.aliyun.com: servname not supported for AI_ socktype (-8)

Error reported:

[root@web01 ~]# ntpdate ntp1.aliyun.com

Error resolving ntp1.aliyun.com: Servname not supported for ai_socktype (-8)

11 Feb 20:58:03 ntpdate[3318]: Can't find host ntp1.aliyun.com: Servname not supported for ai_socktype (-8)

11 Feb 20:58:03 ntpdate[3318]: no servers can be used, exiting

Reason: the domain name resolution error is caused by the change or nonexistence of the/etc/services file

[root@web01 etc]# ls -l servic*

-rw-r--r--. 1 root root  10240 Feb 11 02:27 services

-rw-r--r--  1 root root 641020 Feb 11 02:22 services.bak  Long format comparison reveals that the source file has been changed

[root@web01 etc]# mv services /tmp

[root@web01 etc]# ls -l servic*

-rw-r--r-- 1 root root 641020 Feb 11 02:22 services.bak

[root@web01 etc]# mv services.bak  services

[root@web01 etc]# ls -l servic*

-rw-r--r-- 1 root root 641020 Feb 11 02:22 services

[root@web01 etc]# ntpdate ntp1.aliyun.com

12 Feb 17:00:54 ntpdate[3363]: step time server 182.92.12.11 offset 71111.641937 sec

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