On Sat, Sep 04, 2021 at 03:34:59PM +0100, Ed W wrote: > On 04/09/2021 12:07, Chris Green wrote: > > On Sat, Sep 04, 2021 at 11:29:32AM +0100, Ed W wrote: > >> On 04/09/2021 09:15, Chris Green wrote: > >> > >>> I was aiming to synchronise the lease file in /var between the two > >>> systems as well as the configuration. > >>> > >> Did you see my suggestion to cross post the events to each machine using > >> a script? I replied in one > >> of your other threads re this situation? I think you could make a > >> simple/imperfect > cluster setup > >> like this fairly easily? (good enough for a small home lan) > >> > > Yes, but I'm not quite clear what you mean by "cross post the events"? > > Do you mean something more than just synchronising the > > /var/lib/misc/dnsmasq.leases > > file between the two systems? > > Hi, yes, dnsmasq emits a dbus event when a lease is created and has a dbus > method to add a lease to > it's db. > > Both can be scripted (examples given), so you can effectively "do something" > every time a lease is > handed out and poke the details of that lease into the other system *live*, > ie it goes directly into > its in memory db (which eventually will filter out to the on disk db) > > This gives you your optimal solution in that both machines have an in sync > view of the lease table, > ie promoting the second machine will immediately know the state of all > the leases handed out by the > first > > I speculate (without proof) that it might even work "well enough" to have > both machines online and > fighting to hand out dhcp leases... It's definitely *wrong*, but on a small > network it might not > break... > I think I can probably just use syncthing to synchronise the lease file across systems. Since the normal case will be that only one system is changing the file it's a simple sync requirement.
If/when a system fails sync is no longer doing anything. Trying to run both DHCP servers seems just a bit risky! :-) -- Chris Green _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
