Hostname change after every reboot

[asmar]

Hi all,

I've got a Proxmox4 running fine but any LXC VM I'm creating it doesn't keep the hostname I give and after every reboot it change.

For example, I setup during installation the hostname on a vm to be "vm1.mydomain.com"
When I reboot or shutdown the VM then if I run hostname I get just the name and not the full hostname so it is showing vm1 instead of vm1.mydomain.com and that gives me problem on a software I'm running.

Is this a bug and any workaround on it?

Thanks

Example output:

root@proxmox2 ~ # cat /etc/pve/lxc/101.conf
arch: amd64
cpulimit: 6
cpuunits: 1024
hostname: email1.mydomain.com
memory: 8192
nameserver: 208.67.222.222 8.8.8.8 8.8.4.4
net0: bridge=vmbr0,gw=192.168.1.10,hwaddr=32:63:32:30:38:36,ip=192.168.1.10/32,name=eth0,type=veth
ostype: debian
rootfs: local:101/vm-101-disk-1.raw,size=60G
searchdomain: google.de
swap: 8192



root@email1:~# hostname -f
email1

root@email1:~# cat /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
192.168.1.10 email1 email1.mydomain.com

 

[asmar]

After a few tests, this is happening only on the LXC Debian 8 template. Installing CentOS 7 works fine.
Any idea about where I can download a different Debian Jessie template to test?

Thanks

 

[asmar]

Anyone with a suggestion on this?

 

[fireon]

Hmm, i don't know, but maybe this is a problem with hostnamectl in the container it self. Hostnamectl is used by systemd to set the hostname and other hostinformation. Test this: Set the hostname first normaly in lxc, then set it second time in the container direktly with hostnamectl.

 

[DavidM]

I have the same problem with Proxmox4 Debian8 template: whatever changes made to /etc/hosts: it is reset at each restart of the vm.
Note that there is no hostnamectl command installed and systemd is deactivated on proxmox4 debian8 template.

 

[asmar]

Davidm, tried anything I found and simply doesn't work. I switched to KVM which works fine.

 

[LnxBil]

@DavidM: Simplest solution would be to set the immutable attribute on the file /etc/hosts.

 

[fabian]

See bug#827 for detailled discussion and upcoming changes in this area: https://bugzilla.proxmox.com/show_bug.cgi?id=827

 

[asmar]

@LnxBil if you put the /etc/hostname in immutable the vm doesn't start afterwards.

lxc-start 1458917760.765 ERROR lxc_conf - conf.c:run_buffer:342 - Script exited with st
atus 1
lxc-start 1458917760.765 ERROR lxc_start - start.c:lxc_init:436 - failed to run pre-sta
rt hooks for container '103'.
lxc-start 1458917760.765 ERROR lxc_start - start.c:__lxc_start:1170 - failed to initial
ize the container
lxc-start 1458917765.770 ERROR lxc_start_ui - lxc_start.c:main:344 - The container fail
ed to start.
lxc-start 1458917765.770 ERROR lxc_start_ui - lxc_start.c:main:346 - To get more detail
s, run the container in foreground mode.
lxc-start 1458917765.770 ERROR lxc_start_ui - lxc_start.c:main:348 - Additional informa
tion can be obtained by setting the --logfile and --logpriority options.