[Dnsmasq-discuss] listening on multiple ports at the same time

[Geert Stappers]

On Tue, Dec 06, 2022 at 08:40:57PM +0000, Simon Kelley wrote:
> On 06/12/2022 18:51, Gordon Shawn wrote:
> > can dnsmasq listen on different ports(e.g. 53, 5353,5354,5355) in the
> > same time with a single process running? each port can have its own
> > configuration. so far I invoke multiple dnsmasq processes to do that. if
> > they can share with one process I can save some memory.
> 
> That's not supported.
> 
> Multiple processes is the best way to go.
> 

File systemd at .service ( see below
or https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=debian/systemd@.service;hb=HEAD )
seems to be intented for it.  But I never understood how to use. I did
get that %i  is some placeholder gets expanded, didn't get how to
translate it to further configuration item.





Groeten
Geert Stappers

------8<----8<----8<------
[Unit]
Description=dnsmasq (%i) - A lightweight DHCP and caching DNS server
Requires=network.target
Wants=nss-lookup.target
Before=nss-lookup.target
After=network.target

[Service]
Type=forking
PIDFile=/run/dnsmasq/dnsmasq.%i.pid

# Test the config file and refuse starting if it is not valid.
ExecStartPre=/etc/init.d/dnsmasq checkconfig "%i"

# We run dnsmasq via the /etc/init.d/dnsmasq script which acts as a
# wrapper picking up extra configuration files and then execs dnsmasq
# itself, when called with the "systemd-exec" function.
ExecStart=/etc/init.d/dnsmasq systemd-exec "%i"

# The systemd-*-resolvconf functions configure (and deconfigure)
# resolvconf to work with the dnsmasq DNS server. They're called like
# this to get correct error handling (ie don't start-resolvconf if the
# dnsmasq daemon fails to start).
ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf "%i"
ExecStop=/etc/init.d/dnsmasq systemd-stop-resolvconf "%i"


ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target
------>8---->8---->8------

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