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Another option is to make customized guest images that are preconfigured as you like them.

In a previous role, I had to maintain all linux distro guest images for use inside a corporate cloud deploy. This included pointing ntpd to corp IT ntp servers for compliance.

I did this by creating a custom element for diskimage-builder, and we would periodically update the images.

> On Aug 18, 2017, at 12:35 PM, Carlos Konstanski <ckonstanski at pippiandcarlos.com> wrote:
> 
> I am searching for a way to set NTP servers in instances. Thre are at
> least two ways to do this that come to mind: DHCP and cloud.cfg. I would
> like to explore DHCP for this discussion.
> 
> dnsmasq supports the following configuration:
> 
>    dhcp-option=option:ntp-server,<host1>,<host2>,...
> 
> In the Ubuntu /etc/init.d/ntp service script the following can be found:
> 
>    if [ /var/lib/ntp/ntp.conf.dhcp -nt /etc/ntp.conf ]; then
>        NTPD_OPTS="$NTPD_OPTS -c /var/lib/ntp/ntp.conf.dhcp"
>    fi
> 
> It would seem that the two work together to allow DHCP to override
> /etc/ntp.conf.
> 
> The question is how to get openstack to configure dnsmasq thusly. There
> are two possibilities: a neutron config option or the overriding of the
> entire dnsmasq.conf. The former would be mch simpler and less messy. Is
> there such a setting in neutron.conf?
> 
> Carlos Konstanski
> 
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