[Samba] Dynamic DNS Updates Causing DHCP Timeouts

[Jeremy Allison]

On Wed, Feb 24, 2021 at 02:50:56PM -0500, ralph strebbing via samba wrote:
>So an update on the situation as we've been testing internally all day on this:
>We messed with branching the process and the solution we came up with
>was to change the script being called in dhcpd.conf.
>Instead of directly calling /usr/local/bin/dhcp-dyndns.sh, dhcpd now
>calls another script (dubbed asyncdyndns.sh), which forks the process
>and allows dhcpd to continue on it's way. After testing this
>implementation on our test network, the problem was resolved and the
>dhcp-dyndns script is still being run albeit in parallel now. The
>script is below:
>
>```
>#!/bin/bash
>runWithDelay() {
>sleep 1;
>"${@}";
>}
>runWithDelay /usr/local/bin/dhcp-dyndns.sh "$@" &
>echo Running DynamicDNS Script
>```
>We'll be testing on the production network tomorrow and I'll report
>how the test goes!
>
>Oh, it's also worth noting the other change I noticed was the
>dhcp-dyndns.cc file generated for Kerberos is now owned and accessed
>by dhcpd rather than root, not sure if that would affect anything, but
>the script was able to renew and generate the ticket so it seemed to
>work fine.

Thanks for persevering and giving us an update with
the fix Ralph !