https://linuxize.com/post/how-to-change-hostname-on-ubuntu-18-04/
hostnamectl
hostnamectl bamboo sudo hostnamectl set-hostname jira hostnamectl jira
hosts
sudo cp /etc/hosts /etc/hosts.bak sudo nano /etc/hosts 127.0.1.1 bamboo 127.0.0.1 jira
EDIT cloud.cfg ( if cloud-init installed )
ls -l /etc/cloud/cloud.cfg
setup@bamboo:~$ ls -la /etc/cloud/cloud.cfg
-rw-r--r-- 1 root root 3612 May 11 2019 /etc/cloud/cloud.cfg
Search for preserve_hostname and change the value from false to true:
sudo nano /etc/cloud/cloud.cfg
# This will cause the set+update hostname module to not operate (if true) preserve_hostname: false # This will cause the set+update hostname module to not operate (if true) preserve_hostname: true
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