[SOLVED] LXC not getting host time

[CharlesErickT]

Hello,

From my understanding, a container should get his date and time settings from the host ?

I'm asking because all my containers on a said host are in UTC timezone while the host is on the EST timezone. Rebooting the host and the containers changed nothing.

Do I need to set /etc/localtime manually in the container ? What if NTP is installed on the host ? Shouldn't the containers pull the NTP time from the host ?

The containers are Ubuntu 16.04 LTS

and here's my pveversion -v on the host

proxmox-ve: 5.1-25 (running kernel: 4.13.4-1-pve)
pve-manager: 5.1-35 (running version: 5.1-35/722cc488)
pve-kernel-4.13.4-1-pve: 4.13.4-25
libpve-http-server-perl: 2.0-6
lvm2: 2.02.168-pve6
corosync: 2.4.2-pve3
libqb0: 1.0.1-1
pve-cluster: 5.0-15
qemu-server: 5.0-17
pve-firmware: 2.0-3
libpve-common-perl: 5.0-20
libpve-guest-common-perl: 2.0-13
libpve-access-control: 5.0-7
libpve-storage-perl: 5.0-16
pve-libspice-server1: 0.12.8-3
vncterm: 1.5-2
pve-docs: 5.1-12
pve-qemu-kvm: 2.9.1-2
pve-container: 2.0-17
pve-firewall: 3.0-3
pve-ha-manager: 2.0-3
ksm-control-daemon: 1.2-2
glusterfs-client: 3.8.8-1
lxc-pve: 2.1.0-2
lxcfs: 2.0.7-pve4
criu: 2.11.1-1~bpo90
novnc-pve: 0.6-4
smartmontools: 6.5+svn4324-1
zfsutils-linux: 0.7.2-pve1~bpo90

Thanks

 

[tom]

set your timezone in your lxc container with:

> dpkg-reconfigure tzdata

 

[CharlesErickT]

set your timezone in your lxc container with:

> dpkg-reconfigure tzdata

Then the time will be synchronise with the host if they are on the same timezone and the host is an NTP server or they are separate and not related ?

 

[wbumiller]

The timezone is normally used purely for the purpose of dispalying the time or parsing user input. Internally your container will use the host's clock.
So if they're using the same timezone, they should display the same time, but one's timezone setting will not influence the other's.

 

[CharlesErickT]

Thanks for your time. This answers all my questions

 

[freesbee]

I would like to start the ntp service in a (debian12) lxc container, for exposing the host time to the other clients.
The syntax that was working properly on debian11 lxc container, now brings to the error

systemd[1]: ntpsec.service - Network Time Service was skipped because of an unmet condition check (ConditionCapability=CAP_SYS_TIME)

Obviously, I have already tried all other fix described in this post.
Can anybody point me into the right direction?

 

[DonnerGunther]

At first thank you for all this information.

For me it is necessary to use an LXC with another IP-Address like the Proxmox host, because of one of my clients which is connected via lan cable needs a specific IP to communicate. I use Proxmox 8.1.4 and a debian 12 lxc. I installed ntp on the proxmox host and with it´s IP I can get a time with another client. But, when I run on the debian LXC this:

service ntp status

It tells me this:

* ntpsec.service - Network Time Service
     Loaded: loaded (/lib/systemd/system/ntpsec.service; enabled; preset: enabled)
     Active: inactive (dead)
  Condition: start condition failed at Thu 2024-03-14 09:51:46 CET; 22s ago
             `- ConditionCapability=CAP_SYS_TIME was not met
       Docs: man:ntpd(8)

And the Client can´t fetch the time. What did I wrong? Could anybody help me?

 

[DonnerGunther]

At first thank you for all this information.

For me it is necessary to use an LXC with another IP-Address like the Proxmox host, because of one of my clients which is connected via lan cable needs a specific IP to communicate. I use Proxmox 8.1.4 and a debian 12 lxc. I installed ntp on the proxmox host and with it´s IP I can get a time with another client. But, when I run on the debian LXC this:

service ntp status

It tells me this:

* ntpsec.service - Network Time Service
     Loaded: loaded (/lib/systemd/system/ntpsec.service; enabled; preset: enabled)
     Active: inactive (dead)
  Condition: start condition failed at Thu 2024-03-14 09:51:46 CET; 22s ago
             `- ConditionCapability=CAP_SYS_TIME was not met
       Docs: man:ntpd(8)

And the Client can´t fetch the time. What did I wrong? Could anybody help me?

I don´t want to spam here.

But I solved my problem. I faced it yesterday and I thought maybe you can help me. But I found one way and want to share it with you. Maybe it helps anybody else.

For my understanding, like @wbumiller said, the container is more integrated in the host, as I thought and I had do cut some bindings.

I only added this lines to the config of the container:

lxc.cap.drop:
lxc.cap.drop: mac_admin mac_override sys_module

I found it here:
https://forum.proxmox.com/threads/vm-time-server-on-proxmox4-step-systime-problem.27831/