How To Set Hostname And Domainnmae In CentOS 7?

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We can permanently set hostname using hostnamectl set-hostname. How can we permanently set *domain name* in CentOS 7?
I found an article

that recommended setting FQDN using hostnamectl. Is that the right way to set hostname and domainname at the same time using *hostnamectl set-hostname* command?

Running *hostnamectl set-hostname* will set the hostname in* /etc/hostname*
but it doesn’t change */etc/hosts*. What’s the proper way of adding hostname and FQDN to */etc/hosts *in CentOS 7?

Thanks,

Joe

6 thoughts on - How To Set Hostname And Domainnmae In CentOS 7?

  • vi or your text editor of choice. Though there should be a ‘domainname’
    command to set it as well, though I just prefer editing /etc/hosts directly.

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  • Technically speaking one shouldn’t put the hostname in /etc/hosts as it’s not required so long as your DNS is working … which it should be …

  • Not sure about everyone else, but I always put my hostname in /etc/hosts. Maybe that’s from years of not always having DNS available back when the earth was cooling.

  • This behaviour plays havoc with templated VMs though or any time you can’t be sure the IP there will be correct …

    At which point you start having to script fixing it etc or weird things happen.

    I can’t recall if it hit EL7 yet but Fedora has nss-myhostname so it’ll probably arrive in EL7 eventually to ensure the local hostname is always resolvable to the system IP if it exists or at least 127.0.0.2 so stuff relying on gethostname() doesn’t have issues and the older /etc/hosts shenanigans are not required.

  • indeed, most all my servers except a few key infrastructure servers are configured with DHCP reservations.

  • We can permanently set hostname using  hostnamectl set-hostname. How can we permanently set *domain name* in CentOS 7?
    I found an article
    <http://unix.stackexchange.com/questions/239920/how-to-set-the-fully-qu alified-hostname-on-CentOS-7-0>
    that recommended setting FQDN using hostnamectl. Is that the right way to set hostname and domainname at the same time using *hostnamectl set-hostname* command?

     Running *hostnamectl set-hostname* will set the hostname in*
    /etc/hostname*
    but it doesn’t change */etc/hosts*. What’s the proper way of adding hostname and FQDN to */etc/hosts *in CentOS 7?

    Thanks,

    Joe