[Users] Changing System Time from container under OpenVZ 7

[jjs - mainphrame]

Thanks for this -

I had a hardware failure and am down to one openvz server, so I don't want
to rock the boat. When the new box arrives this week, I'll migrate the CTs,
boot to the new kernel, try the sys_time capability and report back.

Jake

On Tue, May 28, 2019 at 2:57 AM Konstantin Khorenko <khorenko at virtuozzo.com>
wrote:

> On 05/21/2019 12:25 PM, Konstantin Khorenko wrote:
> > Hi Jake, Ming,
> >
> > i've created a feature request to reintroduce sys_time capability:
> > https://bugs.openvz.org/browse/OVZ-7096
> >
> > It does not look too complicated, so hope it will be implemented.
> >
> > BTW, feel free to contribute. :)
> > IT worked in OpenVZ 6, need just to check the code of kernel and vzctl
> and port the patches. :)
>
> JFYI: the feature is ready (documentation is TBD),
> so you can use the feature, all you need is to update vzkernel and
> libvzctl from factory repo:
>    vzkernel-3.10.0-957.12.2.vz7.96.6
>    libvzctl-7.0.521
>
> https://download.openvz.org/virtuozzo/factory/x86_64/os/Packages/v/
> https://download.openvz.org/virtuozzo/factory/x86_64/os/Packages/l/
>
> Hope that helps.
>
> --
> Best regards,
>
> Konstantin Khorenko,
> Virtuozzo Linux Kernel Team
>
>
> > On 05/20/2019 09:28 PM, jjs - mainphrame wrote:
> >> Hi Konstantin,
> >>
> >> Just wanted to follow up on the removal of capability sys_time -
> >>
> >> This change is rather disappointing, because it means that virtuozzo
> containers can no longer be used in the role they played in the past and
> the management will likely just order
> >> them replaced by VMware instances when it's time for hardware refresh.
> >>
> >> Sure, it's not optimal to have multiple containers potentially
> adjusting the system time, but even if its a kludge, it was a very useful
> one.
> >>
> >> Jake
> >>
> >>
> >>
> >> On Thu, May 16, 2019 at 8:59 AM jjs - mainphrame <jjs at mainphrame.com
> <mailto:jjs at mainphrame.com>> wrote:
> >>
> >>     Hi Konstantin,
> >>
> >>     With commercial Virtuozzo, we deployed containers to various lans,
> where each container served ntp, among other things.The host itself is
> isolated.
> >>     Removal of this capability brings about a dead end scenario. Is
> there some other way to accomplish the ntp server duties moving forward?
> >>
> >>     Jake
> >>
> >>
> >>     On Thu, May 16, 2019 at 5:19 AM Konstantin Khorenko <
> khorenko at virtuozzo.com <mailto:khorenko at virtuozzo.com>> wrote:
> >>
> >>         On 05/16/2019 02:29 PM, Nethub Online - Ming wrote:
> >>         > Hi Konstantin,
> >>         >
> >>         > It is because we want to setup a NTP server in CT, and then
> let other servers to update their system time via ntpdate from this CT.
> However after install NTP server in
> >>         this CT, it
> >>         > is unable to start NTP service.
> >>
> >>         Hi again,
> >>
> >>         thank you, the usecase is understandable.
> >>         We usually just run ntp clients on all hosts and don't face
> with time unsync in Containers,
> >>         it's only a matter of one-time configuration of ntp service...
> >>
> >>         --
> >>         Best regards,
> >>
> >>         Konstantin Khorenko,
> >>         Virtuozzo Linux Kernel Team
> >>
> >>         > 於 2019年5月16日 下午5:25，"Konstantin Khorenko" <
> khorenko at virtuozzo.com <mailto:khorenko at virtuozzo.com> <mailto:
> khorenko at virtuozzo.com <mailto:khorenko at virtuozzo.com>>>
> >>         寫道：
> >>         >
> >>         >     On 05/15/2019 05:11 AM, Nethub Online - Ming wrote:
> >>         >     > Hi all,
> >>         >     >
> >>         >     > In OpenVZ 6 users guide (
> https://download.openvz.org/doc/OpenVZ-Users-Guide.pdf ), it allows me to
> change hardware node system time from container by command
> >>         "vzctl set 101
> >>         >     > --capability sys_time:on --save"
> >>         >     >
> >>         >     > However I found that there is no such parameter for
> vzctl or prlctl under OpenVZ 7, may I know how to change hardware node
> system time from CT under OpenVZ 7?
> >>         >
> >>         >     Hi,
> >>         >
> >>         >     no way at the moment and you are the first who ask for it.
> >>         >     Why do you need it?
> >>         >     What it your usecase?
> >>         >
> >>         >     Thank you.
> >>         >
> >>         >     --
> >>         >     Best regards,
> >>         >
> >>         >     Konstantin Khorenko,
> >>         >     Virtuozzo Linux Kernel Team
> >>         >
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