Re: [chrony-users] Does chrony support the DHCP option ntp-servers?

["Jason W. Lewis" <jwlewis@xxxxxxxxxxxxxxx>]

Thank you Bill.  When I looked at your rpm command, I realized the problem - I had the path wrong; I even read right past it in some of the previous responses (my apologies guys!).  I looked on the path you provided and found the script.  From there I found the real culprit: the script looks under /var/lib/dhclient for the temporary chrony.conf.  As this is for a PXE boot environment, the clients "drive" is read-only.  Mounting a tmpfs filesystem to /var/lib/dhclient should do the trick.

Thanks everyone!
-- 
Jason Lewis
Senior Systems Engineer
 

On 3/31/20, 15:18, "Bill Unruh" <unruh@xxxxxxxxxxxxxx> wrote:

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    On Tue, 31 Mar 2020, Jason W. Lewis wrote:
    
    > That missing script is /etc/dhcp/dhclient.d/chrony.sh. It all should
    >    work out of the box. I maintain the chrony package in RHEL/CentOS. :)
    >
    > Oh wow, that's good to hear!  Do you then know which package I need to install to get chrony.sh?  dhclient itself is already installed, but the script is not present.  I tried "dnf provides chrony.sh", but no package was found.
    
    On my Mageia 7 system ( which I agree is not Redhat/CentOS) it is in the above
    directory and is supplied by the chrony package. Did you install chrony
    while not root?
    rpm -qf /etc/dhcp/dhclient.d/chrony.sh
    chrony-3.4-2.mga7
    >
    > In any case, thank you for all the information provided.
    >
    > --
    > Jason Lewis
    > Senior Systems Engineer
    >
    >
    > On 3/31/20, 11:09, "Miroslav Lichvar" <mlichvar@xxxxxxxxxx> wrote:
    >
    >    External email – Please make sure you trust the source before clicking links or opening attachments.
    >
    >    On Tue, Mar 31, 2020 at 03:03:17PM +0000, Jason W. Lewis wrote:
    >    > Miroslav,
    >    > You are correct, this is about the client-side; I've already got my DHCP server configured.
    >    >
    >    > After reading your and Holger's comments, I did realize I was going somewhat in the wrong direction, though.  As I now understand it, the configuration is (at least mostly) with the DHCP client.  I am working on this on CentOS 8, and am using Network Manager.  I see that NM has a chrony script (/etc/NetworkManager/dispatcher.d/20-chrony) which, when the network goes up or down, toggles the on/offline status of chrony.  I also see that it has a script (11-dhclient) looks to see if there are scripts in /etc/dhclient.d, and runs them.  One of the scripts it looks for is one for chrony.  Unfortunately, that directory doesn't exist, much less the script itself.
    >
    >    That missing script is /etc/dhcp/dhclient.d/chrony.sh. It all should
    >    work out of the box. I maintain the chrony package in RHEL/CentOS. :)
    >
    >    > To further potentially complicate things, These systems are PXE booting, so they're getting their info from a DHCP server before the kernel and the OS load.
    >
    >    I wouldn't expect that to matter. NetworkManager should make its own
    >    DHCP request.
    >
    >    --
    >    Miroslav Lichvar
    >
    >
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