With the container's config lxc.utsname = foobar it would be expected that the container's hostname would be matching foobar (parsed into hostname file of the respective container).

However, having tested various container installation the hostname ends up being the standard one of the respective distro, e.g. this one ArchLinux

https://forum.turris.cz/uploads/default/original/2X/8/824139afea2ab70c51fc45b12a92292fe3297e8b.png

TOS RC 3.11.1 | liblxc 1.1.5-15 | luci-app-lxc 20160616-1 | lxc 1.1.5-15 | lxc-attach 1.1.5-15 | lxc-auto 1.1.5-15 | lxc-autostart 1.1.5-15 | lxc-cgroup 1.1.5-15 | lxc-checkconfig 1.1.5-15 | lxc-clone 1.1.5-15 | lxc-common 1.1.5-15 | lxc-config 1.1.5-15 | lxc-configs 1.1.5-15 | lxc-console 1.1.5-15 | lxc-create 1.1.5-15 | lxc-destroy 1.1.5-15 | lxc-device 1.1.5-15 | lxc-execute 1.1.5-15 | lxc-freeze 1.1.5-15 | lxc-hooks 1.1.5-15 | lxc-info 1.1.5-15 | lxc-init 1.1.5-15 | lxc-ls 1.1.5-15 | lxc-lua 1.1.5-15 | lxc-monitor 1.1.5-15 | lxc-monitord 1.1.5-15 | lxc-snapshot 1.1.5-15 | lxc-start 1.1.5-15 | lxc-stop 1.1.5-15 | lxc-templates 1.1.5-15 | lxc-unfreeze 1.1.5-15 | lxc-unshare 1.1.5-15 | lxc-user-nic 1.1.5-15 | lxc-usernsexec 1.1.5-15 | lxc-wait 1.1.5-15 | rpcd-mod-lxc 20141012