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[LuisaWalker]

Manually append "HOSTNAME=dbametrix.com" into file /etc/sysconfig/network and restart system does not work on Oracle Linux 7. Could anybody guide me how to change hostname manually in Oracle Linux 7?

[Mark Greaves (PCNetSpec)]

what's the contents of

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gedit /etc/hostname
and

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gedit /etc/hosts



See here:
https://docs.oracle.com/en/operating-systems/oracle-linux/8/obe-hostname-cli/index.html
for how to use hostnamectl set-hostname to change the hostname.

or here:
https://linuxforums.org.uk/index.php?topic=3832.msg27792#msg27792
for how to edit /etc/hostname manually.