CentOS documentation和RHEL deployment guide说主机名应该是FQDN：
HOSTNAME=<value>,where<value>should be the Fully Qualified Domain
Name (FQDN),such ashostname.example.com,but can be whatever
hostname is necessary.
RHEL install guide稍微含糊不清：
Setup prompts you to supply a host name for this computer,either as a
fully-qualified domain name (FQDN) in the format hostname.domainname
or as a short host name in the format hostname.
The Debian reference表示主机名不应使用FQDN：
3.5.5. The hostname
The kernel maintains the system hostname. The init script in runlevel
S which is symlinked to “/etc/init.d/hostname.sh” sets the system
hostname at boot time (using the hostname command) to the name stored
in “/etc/hostname“. This file should contain only the system hostname,
not a fully qualified domain name.
我没有看到IBM提出哪些具体建议,但some software似乎有偏好.
我的问题：
>在异构环境中,使用供应商建议或选择一个并在所有主机上保持一致是否更好？
>您遇到的哪个软件对主机名是设置为FQDN还是短名称很敏感？
解决方法
我使用短名称作为HOSTNAME设置,并将FQDN设置为服务器IP的/ etc / hosts中的第一列,然后是短名称.
我没有遇到过许多强制执行或显示两者之间偏好的软件包.我发现短名称对某些应用程序更清晰,特别是日志记录.也许我看到像server.northside.chicago.rizzomanufacturing.com这样的内部域名是不吉利的.谁想在日志或shell提示符中看到它？
有时,我参与公司收购或重组,内部域和/或子域名发生变化.我喜欢在这些情况下使用短主机名,因为日志记录,kickstart,打印,系统监控等不需要完全重新配置来考虑新域名.
具有内部域“ifp.com”的名为“rizzo”的服务器的典型RHEL / CentOS服务器设置如下所示：
/etc/sysconfig/network: HOSTNAME=rizzo ...
–
/etc/hosts: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 172.16.100.13 rizzo.ifp.com rizzo
–
[root@rizzo ~]# hostname rizzo
–
/var/log/messages snippet: Dec 15 10:10:13 rizzo proftpd[19675]: 172.16.100.13 (::ffff:206.15.236.182[::ffff:206.15.236.182]) - Preparing to chroot to directory '/app/upload/GREEK' Dec 15 10:10:51 rizzo proftpd[20660]: 172.16.100.13 (::ffff:12.28.170.2[::ffff:12.28.170.2]) - FTP session opened. Dec 15 10:10:51 rizzo proftpd[20660]: 172.16.100.13 (::ffff:12.28.170.2[::ffff:12.28.170.2]) - Preparing to chroot to directory '/app/upload/ftp/SRRID'
