Can not change short host name to long host name.

[lc63]

Hello,

Spoiler: pveversion

# pveversion -v
proxmox-ve: 5.4-1 (running kernel: 4.15.18-16-pve)
pve-manager: 5.4-7 (running version: 5.4-7/fc10404a)
pve-kernel-4.15: 5.4-4
pve-kernel-4.15.18-16-pve: 4.15.18-41
corosync: 2.4.4-pve1
criu: 2.11.1-1~bpo90
glusterfs-client: 3.8.8-1
ksm-control-daemon: 1.2-2
libjs-extjs: 6.0.1-2
libpve-access-control: 5.1-10
libpve-apiclient-perl: 2.0-5
libpve-common-perl: 5.0-52
libpve-guest-common-perl: 2.0-20
libpve-http-server-perl: 2.0-13
libpve-storage-perl: 5.0-43
libqb0: 1.0.3-1~bpo9
lvm2: 2.02.168-pve6
lxc-pve: 3.1.0-3
lxcfs: 3.0.3-pve1
novnc-pve: 1.0.0-3
proxmox-widget-toolkit: 1.0-28
pve-cluster: 5.0-37
pve-container: 2.0-39
pve-docs: 5.4-2
pve-edk2-firmware: 1.20190312-1
pve-firewall: 3.0-22
pve-firmware: 2.0-6
pve-ha-manager: 2.0-9
pve-i18n: 1.1-4
pve-libspice-server1: 0.14.1-2
pve-qemu-kvm: 3.0.1-4
pve-xtermjs: 3.12.0-1
qemu-server: 5.0-53
smartmontools: 6.5+svn4324-1
spiceterm: 3.0-5
vncterm: 1.5-

I would like to change the hostname of a debian buster container, to have a long host name.
But it seems to be not permanent.

I changed the host name on the proxmox UI (short name to long name) and I have the long host name in /etc/pve/nodes/NODE/lxc/CTN.conf.
But after a container reboot, the value of /etc/hostname is changed by proxmox for the short host name.

On debian buster containers, note that the systemd-hostnamed service does not start in the container :

systemd-hostnamed.service: Failed to set up mount namespacing: Permission denied
systemd-hostnamed.service: Failed at step NAMESPACE spawning /lib/systemd/systemd-hostnamed: Permission denied

Any ideas ?

 

[lc63]

systemd-hostnamed issue is fixed by disabling apparmor on this container :

lxc.apparmor.profile: unconfined

I can now use hostnamectl to manually set the hostname. But still the same problem on buster and stretch containers.

I do not reproduce this problem on pure LXC 3.