Hostnamectl: Difference between revisions

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=Overview=
=Overview=


<tt>hostnamectl</tt> is the recommended tool to administer the three separate classes of host names ([[Linux Hostname#static_hostname|static]], [[Linux Hostname#pretty_hostname|pretty]] and [[Linux Hostname#transient_hostname|transient]]) in use on a given system.
=Displaying Hostname Information=
<pre>
hostnamectl status
  Static hostname: docker-server.local
        Icon name: computer-vm
          Chassis: vm
        Machine ID: 265bdd8b7fe74f8db5fa674d8afde0c2
          Boot ID: e862ea344dd24bcfa7c398039a0a9493
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
      CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-514.10.2.el7.x86_64
      Architecture: x86-64
</pre>


=Change the Host Name=
=Change the Host Name=
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</pre>
</pre>


This commands changes all the hostnames ([[Linux Hostname#static_hostname|static]], [[Linux Hostname#pretty_hostname|pretty]] and [[Linux Hostname#transient_hostname|transient]]) of the system.
This commands changes all the hostnames ([[Linux Hostname#static_hostname|static]], [[Linux Hostname#pretty_hostname|pretty]] and [[Linux Hostname#transient_hostname|transient]]) of the system. For more details on host names and recommended naming conventions, see {{Internal|Linux Hostname#Overview|Linux Host Names}}


==hostnamectl set-hostname and /etc/hosts==
==hostnamectl set-hostname and /etc/hosts==
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{{Warn|This is '''NOT''' the preferred way of changing the host name, <tt>hostnamectl</tt> is.}}
{{Warn|This is '''NOT''' the preferred way of changing the host name, <tt>hostnamectl</tt> is.}}


 
=Setting a Particular Host Name=
=Setting the Name=


<pre>
<pre>
hostnamectl [--static|--pretty|--transient] set-hostname blah
hostnamectl [--static|--pretty|--transient] set-hostname <name>
</pre>
</pre>

Latest revision as of 02:49, 4 April 2017

External

Internal

Overview

hostnamectl is the recommended tool to administer the three separate classes of host names (static, pretty and transient) in use on a given system.

Displaying Hostname Information

hostnamectl status
   Static hostname: docker-server.local
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 265bdd8b7fe74f8db5fa674d8afde0c2
           Boot ID: e862ea344dd24bcfa7c398039a0a9493
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-514.10.2.el7.x86_64
      Architecture: x86-64

Change the Host Name

The preferred way to change a host name is with hostnamectl as follows:

hostnamectl set-hostname <name>

Example:

hostnamectl set-hostname docker-server.local

This commands changes all the hostnames (static, pretty and transient) of the system. For more details on host names and recommended naming conventions, see

Linux Host Names

hostnamectl set-hostname and /etc/hosts


Note that changing the host name with hostnamectl set-hostname does not update /etc/hosts so you may want to review /etc/hosts and change the mapping of the host's network interface addresses to the new name.

If the Name is Publicly Resolved by DNS

TODO http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-hostname.html

/etc/sysconfig/network HOSTNAME

Setting HOSTNAME in /etc/sysconfig/network as shown in the following example

...
NETWORKING=yes
GATEWAY=192.168.0.1
...
HOSTNAME=not500.localdomain

may interfere with network configuration script and change the host name.


This is NOT the preferred way of changing the host name, hostnamectl is.

Setting a Particular Host Name

hostnamectl [--static|--pretty|--transient] set-hostname <name>