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Ubuntu – changing hostname without rebooting

Posted by jpluimers on 2018/01/15

Assembled from various bits in [WayBackHow do I change the hostname without a restart? – Ask Ubuntu.

Assume your new host name is newHostName.

  1. edit /etc/hosts and replace the old hostname with newHostName
  2. Perform these commands:
    hostnamectl set-hostname newHostName
    exec bash
    hostname -f

Both the command prompt and the hostname output should show newHostName.

Note: if you get this when performing hostname -f then you forgot to edit /etc/hosts as per [WayBack] Just so everyone knows, the edit of /etc/hosts did the trick the 12.04 – Why I get hostname: Name or service not known error? – Ask Ubuntu:

hostname: Name or service not known


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