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Accepted
DiogoSaraiva
Asked: 2016-09-09 06:31:26 +0800 CST

hostname doesn't persist after reboot in CentOS 7 instance

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I'm trying to set a hostname with hostnamectl set-hostname server.domain.tld in CentOS 7 but when I reboot it returns to sp-30.localdomain

Always i used that command to change hostname but now is not working, so or i'm missing somethinh or is some bug?

However, how can i change permanently my hostname?

Before rebooting I check /etc/hostname file and its correct but when I reboot it reverts

"SP-30" was the name I gave to the instance in OVH public cloud.

centos networking hostname centos7

2 Answers

  1. Best Answer

    I found that my CentOS 7 Instance uses Cloud-Init every reboot and it sets to originally given hostname every time I reboot the instance.

    I found a solution here:

    https://www.ovh.pt/g1928.hostname

    Which tells that and to get around must have to deactivate an cloud-init module with: manage_etc_hosts: false in /etc/cloud/cloud.cfg file, and then hostname to whatever you want.

    But since my /etc/cloud/cloud.cfg file was different I just deleted: 

    - set_hostname
- update_hostname

    under cloud_init_modules and it worked for me

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  2. Not sure about CentOS, but I also ran into this problem on Ubuntu Server. Resolved with:

    sudo apt-get remove cloud-init
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