[Dnsmasq-discuss] DNS from dhcp-host while client is offline, generate config files
stappers at stappers.nl
Fri Oct 8 20:13:36 UTC 2021
On Fri, Oct 08, 2021 at 10:28:07PM +0300, Alkis Georgopoulos wrote:
> On 10/8/21 10:12 PM, Olaf Hering wrote:
> > Am Fri, 8 Oct 2021 19:02:31 +0300
> > schrieb Alkis Georgopoulos <alkisg at gmail.com>:
> > > yeah I too settled for a sed command
> > Sorry, I do not use sed or anything.
> > If the MAC/ip/hostname triple is know in advance, create a static config
> > file with host-record= and dhcp-host=. Sorry if that was unclear.
> > But if you have a solution that you understand and that appears to work for
> > you, go for it.
> I meant that you too generate the dnsmasq configuration files.
> I.e. a script or a generation command is involved.
> In your example, you maintained your information as a series of shell
> variable assignments (e.g. `dnsdomain=home.arpa`).
> Then you used the `tee` command to generate a dnsmasq configuration file for
> a single client.
> I assume that for many clients, you'd use a loop.
> Using the sed command is similar although simpler as it avoids the need for
> a loop. I use it like this:
> 1) I maintain all our information in a dhcp-hosts.csv file like the
> This is already a valid dnsmasq configuration file.
Thanks for making me realizing that a `.csv` can be configuration file.
> 2) After editing that file, I run the following command to convert it to an
> addn-hosts.csv file:
> sed -n 's/.*,\([0-9]*\.[0-9]*\.[0-9]*\.[0-9]*\),\([-a-z0-9]*\).*/\1\t\2/p' dhcp-hosts.csv > addn-hosts.csv
That same line at multiple physical lines and the `-n` being documented:
sed --silent \
dhcp-hosts.csv > addn-hosts.csv
> So that way, we maintain a single dhcp-hosts.csv file, and we run a single
> command to create the respective addn-hosts.csv file.
> Dnsmasq then uses both of these configuration files.
> Thank you for your time!
Thank you for sharing the sed script that was mentioned two or three
postings by you earlier. It is now in the mailinglist archive.
Silence is hard to parse
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