On Fri, 10 Jan 2020 19:50:47 +0100 "Carlos E. R." <robin.listas@telefonica.net> wrote:
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On 10/01/2020 19.47, James Knott wrote: | On 2020-01-10 01:28 PM, Carlos E. R. wrote: |> On 10/01/2020 16.59, James Knott wrote: |>> On 2020-01-10 10:53 AM, Per Jessen wrote: |>>> I guess this is the Linux version of "a man with one watch |>>> always knows what time it is. A man with two watches is never |>>> sure":-) |>> |>> With NTP, the recommendation is at least 3 sources, as with 2, |>> if one is wrong, you don't know which one. I have my |>> firewall/router configured for 4. |> |> But if your internal desktop machine is using ntp, it also need 4 |> sources. | | For internal devices, I just use 1, my firewall.
And that can make ntp to abort and ntpq to fail. You have to use some other daemon instead with just one clock source.
|> |>> |>> You can specify up to 4 pool.ntp.org servers, by adding a |>> number, such as 0., 1., 2., or 3. before pool.ntp.org. |> |> You can specify country. |> | | Pool.ntp.org will connect to servers according to where you are. | If I ping those addresses, I'll generally see servers in the | Toronto, Ontario area, which is where I live.
Me, I specify a dozen servers, on Spain, Portugal, France... etc. The daemon will choose which to actually use.
Why do you seem to care so much about your clock source? In the worst case, your PC/device will run on its internal clock and will slowly drift. Not a major problem. Once upon a time I worked with a telco setting up an ATM network in London. Their time source was in a rack with five slots. Slot 1 was a GPS card. Slot 2 (backup) was a GPS card. Slot 3 (backup's backup etc) was a GPS card. Slot 4 was a GPS card. Slot 5 was an atomic clock. What they most cared about was keeping the same time as everybody else. Only in extremis did they care about keeping something working. But the requirements for timekeeping in an ATM network are orders of magnitude above what I need, or any other mortal as far as I can see. My ntp.conf has what I think is the default: server 0.opensuse.pool.ntp.org iburst server 1.opensuse.pool.ntp.org iburst server 2.opensuse.pool.ntp.org iburst server 3.opensuse.pool.ntp.org iburst -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org