Install CentOS 7 - Hostname Changes after Reboot

Hi,

I'm having a problem with the Hostname of my CentOS 7 (64bit) - OpenVZ VPS server keeps changing the hostname after reboot.

After CentminMOD installation i followed the instructions of setting the Default Server Hostname as described at: Getting Started Guide - CentminMod.com LEMP Nginx web stack for CentOS

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Before making the changes, when typing "uname -n" the hostname showed just as: "mysubdomain"

After making all the changes, when typing "uname -n" the hostname showed as: "mysubdomain.mydomain.com"

The problem is that everytime i reboot / restart my VPS server, the hostname goes back to the default "mysubdomain" when it should be "mysubdomain.mydomain.com"

Note: On my hosting provider control panel, the hostname for this server is set as: "mysubdomain.mydomain.com"

Does anyone as experience this issue? Any idea on how to resolve it?

Thanks

 

Hi,

Yes i did use the CentOS 7 steps. All remains working properly until reboot the vps server.

Any ideas?

Thanks

 

Hi all.

Thanks for all the help! Bellow i leave my responses to all your questions:

This are the current results with the proper hoostname setup:

[root@subdomain ~]# hostnamectl status
Static hostname: subdomain.domain.com
Icon name: computer-container
Chassis: container
Machine ID: 22ca1661401845c8935f2d08d130acd0
Boot ID: 53040c02424a4164aefce8aa112b0065
Virtualization: openvz
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 2.6.32-042stab113.12
Architecture: x86-64
[root@subdomain ~]# nmcli general hostname
-bash: nmcli: command not found
[root@subdomain ~]# cat /etc/hostname
subdomain.domain.com
[root@subdomain ~]# cat /etc/cloud/cloud.cfg
cat: /etc/cloud/cloud.cfg: No such file or directory
[root@subdomain ~]#

This are the results after reboot is made (you can see hostname changed to only "subdomain"):

[root@subdomain ~]# hostnamectl status
Static hostname: subdomain
Icon name: computer-container
Chassis: container
Machine ID: 22ca1661401845c8935f2d08d130acd0
Boot ID: 53040c02424a4164aefce8aa112b0065
Virtualization: openvz
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 2.6.32-042stab113.12
Architecture: x86-64
[root@subdomain ~]# nmcli general hostname
-bash: nmcli: command not found
[root@subdomain ~]# cat /etc/hostname
subdomain
[root@subdomain ~]# cat /etc/cloud/cloud.cfg
cat: /etc/cloud/cloud.cfg: No such file or directory
[root@subdomain ~]#

Im not using Amaxzon EC2. Im using Time4VPS.eu that uses OpenVZ

Do you mean, in this order: make the hostname change > restart the network > reboot vps server? I have try that now and after reboot, the hostname changed again to just "subdomain".

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Just one final information to say that after reboot the only place the hostname seems not to be saved is when i go to nano -w /etc/hostname that shows just the subdomain and i have to add the domain.

All the following / other steps i do not need to make because it's all set with new hostname.

Thanks

 

Hi eva2000,

I will contact Time4VPS support about this. Bellow i leave you with the results of the cat /etc/hosts:

[root@subdomain ~]# cat /etc/hosts
127.0.0.1 localhost.localdomain localhost localhost4.localdomain4 localhost4
# Auto-generated hostname. Please do not remove this comment.
XXX.XXX.XX.XX subdomain.domain.com subdomain
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@subdomain ~]#
----

Thanks

 

No is not fixed. On their control panel i had already setup the correct hostname as: subdomain.domain.com before start the CentOS installation.

I will contact Time4VPS support team about this.

Thanks

 

Hi eva2000,

Thanks for the advise. I try to change the files as you said and then reboot the server. The hostname problem is still not resolved.

Bellow i leave you copy/paste so you can see how my files are now:

/etc/hosts

127.0.0.1 localhost.localdomain localhost localhost4.localdomain4 persistent_host_name localhost4
# Auto-generated hostname. Please do not remove this comment.
XXX.XXX.XX.XX subdomain.mydomain.com subdomain
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

/etc/sysconfig/network

NETWORKING="yes"
GATEWAYDEV="venet0"

NETWORKING_IPV6=no
HOSTNAME=persistent_host_name

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I still waiting from a response from my hosting support team about this.

Thanks

 

Hi,

So the change you are saying is just on the "persistent_host_name" order on line? It must be placed on the beginning of the line?

Im asking this because i do not see any other change and i think when i first added the "persistent_host_name" record it was on the beginning of the line, but it seems that after reboot the server the "persistent_host_name" was automatic moved to the position before the "localhost4" word.

So i just to change the order from:
127.0.0.1 localhost.localdomain localhost localhost4.localdomain4 persistent_host_name localhost4
to
127.0.0.1 persistent_host_name localhost.localdomain localhost localhost4.localdomain4 localhost4
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Thanks

 

Hi,

You said you are also hosted with Time4VPS and running CentOS 6, correct? Don't you have the same problem with hostname after reboot?

Also, do you have any server with Time4VPS running CentOS 7? My VPS is running CentOS 7 + Minimal OS Config ( as described at: Make minimal OS - Time4VPS Community )

The XXX.XXX.XX.XX is mask of my ip address and subdomain.mydomain.com is also just a mask, for security reasons. And about the A Record pointed to my server hostname is already setup.

Thanks