hostname cmd 與 kernel.hostname

hostname cmd 及 sysctl 的 kernel.hostname 會設置系統的 hosname

查看當前系統的 hostname:

cat /proc/sys/kernel/hostname

Or

hostname

設定 hostname

[A]

/etc/sysconfig/network

HOSTNAME=??????????

P.S.

要 service network restart 才套用

它會設定 $HOSTNAME

echo $HOSTNAME

[B]

修改 /etc/hostname

FQDN

determined by the resolver subsystem

查看

# IP (wan ip)---> hostname

hostname -f

domainname (hostname -d)

/etc/resolv.conf

domain localdomain

當 ping 一個 hostname 時, 比如 ServerA, 當找不到時, 它會自加上 ServerA.localdomain

# tell resolvconf to regenerate resolv.conf

resolvconf -u

NIS domain name(domainname)

Domainname will print the NIS domainname of the system (set, get)

 * gethostname

FQDN(dnsdomainname)(hostname --fqdn )
# The FQDN of the system is the name that the resolver(3) returns for the host name.
# It is not possible to set the FQDN or the DNS domain name with the dnsdomain name command
resolver
* getaddrinfo
* gethostname

P.S.

this is effective only until the  next  reboot.

# only contain the hostname and not the FQDN

/etc/hostname

Centos7 set & view hostname

# view

hostnamectl status

# set

hostnamectl set-hostname xxx