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[ale] Copying config files to DHCP peer

Using a config manager would be perfect, but that's a long row to hoe
if not already using a config manager.
Personally, I'd use Chef above ansible or puppet, but that's just me.
There's a learning curve for the people who want to make config
changes using either of these tools.

On Thu, Dec 19, 2019 at 12:17 PM Joey Kelly via Ale <ale at ale.org> wrote:
> On Thursday, December 19, 2019 10:58:03 AM Todor Fassl via Ale wrote:
> > I have been running peered ISC dhcp servers for years. The problem is
> > that you need copies of the config files on both machines. Say you want
> > to assign an IP address to a new machine. You add a stanza to a config
> > file but then you then have to get a copy of the modified config file to
> > the peer. If you forget to do that, you are going to screw things up
> > pretty badly.
> So write a wrapper that fetches your stanzas or the complete config file, pushes
> them to the servers, then restarts the servers. ansible/puppet can be your
> friend here.
> --Joey
> > Other people in my department occasionally need to make these config
> > changes. So I need a way to guarantee that the config files get copied
> > over. Googling showed me lots of articles on configuring a peer in
> > isc-dhcp but only one on syncing the config files. That person was doing
> > it via rsync and a script in cron.hourly.
> >
> > What I have done, at least for now, is to replace the init script with
> > my own script. This script uses an ssh key to copy the files to the peer
> > and then restarts dhcp on the peer. If somebody types "service dhcp
> > restart", it runs my script. But now with systemd, it is going to be harder.
> >
> > Fortunately, for now, my co-workers are still typing "service bind9
> > restart" and the like. So "service dhcp restart" is not a problem --
> > yet. But if somebody types "systemctl restart isc-dhcp-server", it is
> > not going to work.
> >
> >
> > Its interesting that bind9 and slapd handle this under the covers.
> --
> Joey Kelly
> Minister of the Gospel and Linux Consultant
> http://joeykelly.net
> 504-239-6550
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